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Interlayer sensitized van der Waals heterojunction photodetector with enhanced performance

Nano Research 2023年第7期16卷 10537-10544页

作者： Huide Wang Yonghong Zeng FanXu meng Rui Cao Yi Liu Zhinan Guo Tingting Wang Haiguo Hu Sidi Fan Yatao Yang SWageh Omar AAl-Hartomy Abul kalam Yonghong Shao Yu-Jia Zeng Dianyuan Fan Han Zhang International Collaborative Laboratory of 2D materials for Optoelectronics Science and Technology Institute of Microscale OptoelectronicsInterdisciplinary Center of High Magnetic Field Physics of Shenzhen UniversityCollege of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen 518060China Guangzhou Key Laboratory of Sensing materials and Devices Center for Advanced Analytical ScienceSchool of Chemistry and Chemical EngineeringGuangzhou UniversityGuangzhou 510006China Key Laboratory of Optoelectronic Devices and Systems of ministry of Education and Guangdong Province College of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen 518060China College of Electronics and Information Engineering Shenzhen UniversityShenzhen 518060China Center of Characterization and Analysis Jilin Institute of Chemical TechnologyJilin 132022China School of mathematical&Physical Sciences Wuhan Textile UniversityWuhan 430200China Department of Physics Faculty of ScienceKing Abdulaziz UniversityJeddah 21589Saudi Arabia Research Center for Advanced materials Science(RCAmS) King Khalid UniversityP.O.Box 9004Abha 61413Saudi Arabia Department of Chemistry College of ScienceKing Khalid UniversityP.O.Box 9004Abha 61413Saudi Arabia

Although photodetection based on two-dimensional(2D)van der Waals(vdWs)P-N heterojunction has attracted extensive attention recently,their low responsivity(R)due to the lack of carrier gain mechanism in reverse bias or zero bias operation hinders their applications in advanced photodetection ***,a black phosphorus/rhodamine 6G/molybdenum disulfide(BP/R6G/moS_(2))photodiode with high responsivity at reverse bias or zero bias has been achieved by using interfacial charge transfer of R6G molecules assembled between heterojunction *** formed vdWs interface achieves high performance photoresponse by efficiently separating the additional photogenerated electrons and holes generated by R6G *** devices sensitized by the dye molecule R6G exhibit enhanced photodetection performance without sacrificing the photoresponse *** them,the R increased by 14.8-20.4 times,and the specific detectivity(D^(*))increased by 24.9-34.4 *** strategy based on interlayer assembly of dye molecules proposed here may pave a new way for realizing high-performance photodetection based on 2D vdWs heterojunctions with high responsivity and fast response speed.

关键词： heterojunction photodetector interlayer sensitization charge transfer responsivity

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Early and Sensitive Detection of Pathogens for Public Health and Biosafety:An Example of Surveillance and Genotyping of SARS-CoV-2 in Sewage Water by Cas12a-Facilitated Portable Plasmonic Biosensor

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Research 2024年第2期2023卷 259-272页

作者： Tianzhong Li Yuzhi Chen Zhi Chen Yuan Hao minyi Liang Yingxia Liu Guanyong Ou Huanian Zhang Yuxuan Tang Yabing Hao Swelm Wageh Omar AAl-Hartomy Abul kalam Bin Zhang Xin Shi Xuejin Li Han Zhang College of Physics and Optoelectronic Engineering Institute of Translational MedicineDepartment of OtolaryngologyShenzhen Second People's HospitalFirst Affiliated Hospital of Shenzhen UniversityHealth Science CenterShenzhen UniversityShenzhen 518060China Shenzhen Key Laboratory of Sensor Technology Shenzhen 518060China The Sixth Affiliated Hospital of Guangzhou medical University Qingyuan People's HospitalQingyuan 511518China Shenzhen Key Laboratory of Pathogen and Immunity National Clinical Research Center for Infectious DiseaseState Key Discipline of Infectious DiseaseShenzhen Third People's HospitalSecond Hospital Affiliated to Southern University of Science and TechnologyShenzhen 518112China School of medicine Southern University of Science and TechnologyShenzhen 518055China School of Physics and Optoelectronic Engineering Shandong University of TechnologyZibo 255049China Department of Physics Faculty of ScienceKing Abdulaziz University Jeddah 21589Saudi Arabia Research Center for Advanced materials Science(RCAmS) King Khalid UniversityP.0.Box 9004Abha 61413Saudi Arabia Department of Chemistry College of ScienceKing Khalid UniversityP.0.Box9004Abha 61413 Saudi Arabia Health Sciences Institute China Medical UniversityShenyang 110000China The Chinese University of Hong Kong Shenzhen 518060China

Infectious diseases severely threaten public health and global *** addition to transmission through the air,pathogenic microorganisms have also been detected in environmental liquid samples,such as sewage *** biochemical detection methodologies are time-consuming and cost-ineffective,and their detection limits hinder early *** the present study,ultrafine plasmonic fiber probes with a diameter of 125μm are fabricated for clustered regularly interspaced short palindromic repeats/CRISPR-associated protein(CRISPR/Cas)-12a-mediated sensing of severe acute respiratory syndrome coronavirus 2(SARS-CoV-2).Single-stranded DNA exposed on the fiber surface is trans-cleaved by the Cas12a enzyme to release gold nanoparticles that are immobilized onto the fiber surface,causing a sharp reduction in the surface plasmon resonance(SPR)*** proposed fiber probe is virus-specific with the limit of detection of~2,300 copies/ml,and genomic copy numbers can be reflected as shifts in wavelengths.A total of 21 sewage water samples have been examined,and the data obtained are consistent with those of quantitative polymerase chain reaction(qPCR).In addition,the Omicron variant and its mutation sites have been fast detected using S gene-specific *** study provides an accurate and convenient approach for the real-time surveillance of microbial contamination in sewage water.

关键词： fiber consuming hinder

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Eco-Friendly Pest Control in Cucumber (<i>Cucumis sativa</i>L.) Field with Botanical Pesticides

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Natural Resources 2013年第5期4卷 404-409页

作者： Abul kalam Azad Arif Sardar Nilufa Yesmin mizanur Rahman Saiful Islam Department of Crop Science and Technology University of Rajshahi Rajshahi Bangladesh Institute of Environmental Science University of Rajshahi Rajshahi Bangladesh

A field experiment on eco-friendly pest control in cucumber (Cucumis sativa L.) field was conducted at Rajshahi University during April, 2011 to June, 2011 with eight botanical pesticides prepared from the leaves and seeds of Bangladeshi plants. These botanicals are mahogany seeds, (Swietenia mahagoni), chirata leaves (Swertia chirata), jute seeds (Corchorus olitorius L.), garlic (Allium sativum L.), marigold leaves (Tagetes erecta) and carrot leaves (Daucus carota). One control treatment without botanicals was maintained during this experiment where only water was sprayed. Out of these botanicals, a less number of insect attacks on cucumber leaves (1.33 ± 0.19) were found in combined treatment of mahogany and chirata whereas a high number of insect attacks were observed in combined treatment of garlic and jute seed (5.89 ± 0.40) and control (4.66 ± 0.33). Individual application of chirata extract also showed good protection of cucumber leaves (1.67 ± 0.19) from insect attack. A smaller number of leaves perforations were found in the combined treatment of mahogany and chirata (3.44 ± 0.29) compared to control (14.22 ± 1.05). Chirata extract also showed good performance (4.00 ± 0.19) against leaves perforation of insect. Besides the pest control, botanical pesticides also have enormous effect on plant growth. The tallest cucumber plant was observed in the combined treatment of mahogany and chirata (469.00 ± 63.51 cm) and shortest in garlic treatment (84.56 ± 15.24 cm). The cucumber production was also high in combined treatment of mahogany and chirata (1863.33 ± 196.32 g) compared to control (1260.00 ± 501.63 g). From this study, it is found that combined application of mahogany and chirata extract not only showed good protection of cucumber plant from insect attack but also increased the cucumber production. Therefore, we conclude that farmers should use botanical pesticides from mahogany seeds and chirata leaves instead of toxic chemical insecticides for controllin

关键词： Cucumber Chirata mahogany Extract Eco-Friendly

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Effect of Intravenous methylprednisolone on the Signs &Symptoms of Graves’ Ophthalmopathy

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Open Journal of Endocrine and metabolic Diseases 2019年第9期9卷 95-101页

作者： muhammad Shah Alam A. B. m. Kamrul-Hasan Syeda Tanzina kalam Ajit Kumar Paul Shahjada Selim Department of medicine Army Medical College Cumilla Bangladesh Department of Endocrinology Mymensingh Medical College Hospital Mymensingh Bangladesh Department of medicine Cumilla Medical College Hospital Cumilla Bangladesh Department of Endocrinology Mainamati Medical College Cumilla Bangladesh Department of Endocrinology Bangabandhu Sheikh Mujib Medical University Dhaka Bangladesh

Background: Graves’ ophthalmopathy (GO) is the most frequent extrathyroidal manifestation of Graves’ disease (GD). The effect of intravenous methylprednisolone on the signs and symptoms of GO has not been evaluated in the Bangladeshi population. Objective: To observe the effect of intravenous methylprednisolone in active Graves’ ophthalmopathy. materials/methods: This prospective study conducted in a tertiary hospital of Bangladesh from may 2009 to November 2010 included 30 patients having moderate to severe ophthalmopathy. In addition to the clinical activity score (CAS), eye involvement was assessed by using the “NOSPECS” scoring system. Results: The mean (±SD) age of the patients was 38.1 ± 10.6 years and male-female ratio was 1.2:1. NOSPECS eye findings before treatment and during the final (3rd) visit of the patients were observed. It was found that lid retraction or lid lag was improved in 21 (70%) of the patients during the final visit. All of the patients had soft tissue swelling initially and all of them improved at the final visit. Bilateral proptosis was present in 19 patients before treatment and improved in 12 (62%) patients during the final visit. Right eye proptosis was present in 9 patients before treatment and improved in 5 (60%) patients during final visit. Extraocular muscle involvement (Diplopia) was present in 15 patients before treatment but improved in 13 (86.0%) patients during the final visit. A significant number of subjects showed significant improvement in all of the NOSPECS eye findings (except unilateral right eye proptosis) during the final visit;all had inactive GO (CAS Conclusion: Intravenous methylprednisolone appears to be an effective treatment option for active Graves’ ophthalmopathy.

关键词： Graves’ Ophthalmopathy NOSPECS methylprednisolone

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Optimum Conditions for Bioethanol Production from Potato of Bangladesh

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Advances in Bioscience and Biotechnology 2014年第6期5卷 501-507页

作者： Abul kalam Azad Nilufa Yesmin Shanjit Kumar Sarker Abdus Sattar Rezaul Karim Department of Biochemistry and molecular Biology Rajshahi University Rajshahi Bangladesh Institute of Environmental Science Rajshahi University Rajshahi Bangladesh Institute of Food Science & Technology Bangladesh Council of Scientific and Industrial Research (BCSIR) Dhaka Bangladesh

Bangladesh produces a huge amount of potatoes every year. This research was carried out to find the optimum conditions for bioethanol production from potato of Bangladesh. From this study, optimum growth of yeast (Saccharomyces cerevisiae CCD) was observed at pH 6.0 and temperature 31°C. Addition of a small amount of alpha-amylase enzyme to potato solution was found to enhance the potato starch degradation and made the fermentation process quicker. This study observed that 1750 unit alpha-amylase is enough to degrade the starch in 15% of 500 ml potato starch solution. From fermentation time study, 6-day incubation time was found to be enough to complete the fermentation process and optimum production of bioethanol form potato starch. Suitable concentration of potato in fermentation process was determined using five different potato solutions (5%, 10%, 15%, 20% and 30%). A highest production of bioethanol was found in ?20% potato treatment. Therefore, 20% potato solution is recommended for high-scale production of bioethanol from potato starch.

关键词： Potato Bio-Ethanol Fermentation Alpha-Amylase

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Thermal Balancing of a multi-Cylinder Diesel Engine Operating on Diesel, B5 and Palm Biodiesel Blends

Thermal Balancing of a Multi-Cylinder Diesel Engine Operatin...

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作者： m.J.Abedin H.H.masjuki m.A.kalam A.Sanjid S.m.A.Rahman Centre for Energy Sciences Faculty of EngineeringUniversity of Malaya

Energy crisis and global warming are the two most important issues that threaten the peaceful existence of the human species. more dependency on alternative fuels and energy loss minimization can be an effective solution to this affair. In this regard, thermal balance study of an internal combustion(IC) engine using different biodiesels is worthy of investigation. This manuscript provides an in-depth analysis of the engine heat losses in different subsystems of the engine. Finally, thermal balancing of the engine has been done by showing all energy flows in and out of the engine. The investigation was conducted in a four cylinder diesel engine fuelled with pure diesel, B5(5% Palm biodiesel + 95% Diesel), 10%(PB10) and 20%(PB20) palm biodiesel blends at full load and in the speed range 1000 to 4000 RPm. The water heat loss and lubricating oil heat loss increased whereas the engine brake power, exhaust heat loss and unaccounted heat loss decreased with the increase of biodiesel percentage in the blends.

关键词： Thermal balance heat loss palm biodiesel diesel engine

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Storage Potentialities of Some Exotic Potato Varieties at Farmers’ Condition in Bangladesh

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Agricultural Sciences 2017年第2期8卷 183-193页

作者： Abul kalam Azad Humayun Kabir Touria El-Jaoual Eaton Edward Binod Soren Department of Crop Science & Technology Rajshahi University Rajshahi Bangladesh Department of Horticulture Lincoln University of Missouri Jefferson City USA

Potatoes have to be stored after harvest for a shorter or longer period in order to maintain even supply to the market throughout the year for direct human consumption as well as for the processing industry. The present study focused on the storage potentialities of six exotic varieties of potato viz., Diamant, Cardinal, Granola, Felsina, Provento and Asterix at farmers’ condition. The experiment was conducted during winter (December to march) for cultivation, and spring and summer (march to August) for storage at Domar Foundation Seed Potato Production Farm, BADC, Nilphamari, Bangladesh. Results revealed that there were significant variations in storage behavior among the varieties of potato tubers. Asterix showed minimum weight loss (7.10%) which was statistically identical with Cardinal (7.85%) while it was maximum in Felsina (18.83%) followed by Provento (13.41%) during four months storage conditions practicing by farmers (farmers’ conditions). In respect of rotting, significantly highest degree was found in Felsina (18.72%) followed by Provento (15.01%) and the lowest was in Asterix (2.02%) identically similar with Granola (2.22%). The highest percentage of water loss was found in Provento (27.01%) and the lowest was recorded in Asterix (17.03%). Dormancy period and sprouts per tuber were found highest in Asterix (70 days and 9.67) while the lowest dormancy was in Diamant (56 days) and the lowest sprouting was in Granola (2.50). Asterix was found to produce significantly highest amount of dry matter content (20.50%) along with higher amount of edible stored tubers (80.21%) compared to those of other varieties at the end of four months storage. Under the same condition, Diamant was the second highest producer of dry matter (20%) which was statistically similar with Asterix, and had good storage ability that retained 69.07% edible tubers, whereas Felsina contained the lowest amount of dry matter (16%) and showed poor storage ability retaining 55.85% edible tubers

关键词： Potato Sprouting Behavior Dormancy Weight Loss Tuber Dry matter Content

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Fully depleted vdW heterojunction based high performance photovoltaic photodetector

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Journal of materiomics 2023年第6期9卷 1039-1047页

作者： Yonghong Zeng Fanxu meng Sidi Fan Pengfei Wang Cuiyun Kou mingyi Sun Haiguo Hu Rui Cao Swelm Wageh Omar A.Al-Hartomy Abul kalam Bowen Du Wenchao Ding Songrui Wei Zhinan Guo Qiuliang Wang Han Zhang College of Physics and Optoelectronic Engineering Institute of Microscale OptoelectronicsInternational Collaborative Laboratory of 2D Materials for Optoelectronics Science and TechnologyInterdisciplinary Center of High Magnetic Field Physics of Shenzhen UniversityShenzhen UniversityShenzhen518060China Guangzhou Key Laboratory of Sensing materials and Devices Center for Advanced Analytical ScienceSchool of Chemistry and Chemical EngineeringGuangzhou UniversityGuangzhou510006China Department of Physics Faculty of ScienceKing Abdulaziz UniversityJeddah21589Saudi Arabia Research Center for Advanced materials Science(RCAmS) Department of ChemistryCollege of ScienceKing Khalid UniversityP.O.Box 9004Abha61413Saudi Arabia Foshan Electrical and Lighting Co. LTD64 North Fenjiang RoadFoshanChina Institute of Electrical Engineering Chinese Academy of SciencesBeijing100190China Center of Characterization and Analysis Jilin Institute of Chemical TechnologyJilin132022China

Van der Waals(vdW)heterojunctions,with their unique electronic and optoelectronic properties,have become promising candidates for photodetector *** the contribution of the depletion region in vdW heterojunction,which would enhance both of the collection efficiency and speed of the photogenerated carriers,presents an effective strategy for achieving high performance vdW heterojunction ***,a fully depleted vdW heterojunction photodetector is built on two-dimensional(2D)semiconductor materials(GaTe and InSe)layered on a pattered bottom electrode in vertical structure,in which the generation and motion of carriers are exclusively achieved in the depletion *** to the intrinsic built-in electric field,the elimination of series resistance and the depletion region confinement of carriers,the as-fabricated photodetector exhibits prominent photovoltaic properties with a high open-circuit voltage of 0.465 V,as well as photoresponse characteristics with outstanding responsivity,detectivity and photoresponse speed of 63.7 A/W,3.88×10^(13)Jones,and 32.7 ms *** overall performance of this fully depleted GaTe/InSe vdW heterojunctions photodetectors are ranking high among the top level of 2D materials based *** indicates the device architecture can provide new opportunities for the fabrication of high-performance photodetectors.

关键词： Two-dimensional material van der waals heterojunction Fully depleted photodetector Photovoltaic

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Phytochemical and toxicity evaluation of Phaleria macrocarpa(Scheff.)Boerl by mCF-7 cell line and brine shrimp lethality bioassay

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Journal of Coastal Life medicine 2016年第1期 45-49页

作者： Abul kalam Azad Wan mohd Azizi Wan Sulaiman Nushrat Khan Sunzida Department of Basic medical Sciences Faculty of PharmacyInternational Islamic University MalaysiaJalan Sultan Ahmad Shah25200 Indera MahkotaKuantanPahangMalaysia Gonoshasthaya Samaj Vittik medical College DhakaBangladesh

Objective:To evaluate the cytotoxicity of Phaleria macrocarpa fruits ***:The cytotoxicity test was carried out by in vitro mCF-7 cell line and in vivo brine shrimp lethality ***:The preliminary phytochemical test showed the presence of alkaloids,carbohydrate,glycosides,saponin,terpene,steroids,phenols and *** mTT-assay results showed that the highest percentage of cell viability was 106.23%at concentration of 1.25μL and the lowest percentage was 13.04%at concentration of 10μ***:The mTT-assay and brine shrimp lethality bioassay results showed that the extract was non-toxic and it would be consumable as a herbal remedy.

关键词： mCF-7 Phaleria macrocarpa Brine shrimp lethality bioassay Toxicity

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Evaluation of Six modern Varieties of Potatoes for Yield, Plant Growth Parameters and Resistance to Insects and Diseases

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Agricultural Sciences 2017年第11期8卷 1315-1326页

作者： Touria E. Eaton Abul kalam Azad Humayun Kabir Abu Bakkar Siddiq Cooperative Extension and Research Lincoln University of Missouri Jefferson City MO USA Department of Crop Science & Technology Rajshahi University Rajshahi Bangladesh

Six modern varieties of potatoes (Diamant, Cardinal, Granola, Felsina, Provento and Asterix) were investigated for their growth parameters and yield to determine their suitability for production in Bangladesh. Results indicate significant variations among the varieties in the yield and morphological characteristics and no difference in the number of main stems per hill. Among the six studied varieties, Asterix produced the greatest yield (29.60 t/ha), the greatest number of tubers per hill (13 tubers/hill), the largest percentage (84%) of medium sized tubers (28 - 55 mm diameter), and the greatest plant height (61.33 cm). Diamant performed second after Asterix with a yield of 28.33 t/ha, and a plant height of 59.0 cm. Felsina produced the lowest yield (25.13 t/ha) and the lowest number of tubers per hill (8.67 tubers/hill). In a farmers’ perception study, where farmers scored the yield and resistance to diseases and insect damage of the six varieties, from 1 to 6 (6 being the highest and 1 being the lowest), Asterix was the most preferred variety by farmers with scores of 6, 5.67 and 5.83 for yield, disease resistance and insect resistance respectively. Provento was the least preferred by farmers with a score of overall performance of 4. The results of this study indicate that Asterix and Diamant have the potential to be grown successfully by the farmers in Bangladesh.

关键词： Potato Cultivars Vegetative Parameters Yield Potentials Farmers’ Condition

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