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Preparation and application of microfluidic SERS substrate:Challenges and future perspectives

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Journal of Materials Science & Technology 2020年第2期37卷 96-103页

作者： Jiuchuan Guo Fanyu Zeng Jinhong Guo Xing Ma School of Information and Communication Engineering University of Electronic Science and Technology of ChinaChengdu 610054China State Key Laboratory of Advanced Welding and Joining Harbin Institute of Technology(Shenzhen)Shenzhen 518055China Flexible Printed Electronic Technology Center School of Materials Science and EngineeringHarbin Institute of Technology(Shenzhen)Shenzhen 518055China

Surface-enhanced Raman spectroscopy(SERS),as a highly sensitive molecular analysis technique,can realize fast and non-destructive detection of the information of molecular bonds to identify the component of analytes by"fingerprint"*** preparation of SERS substrates plays an extremely important role in the development of SERS technology and the application of SERS *** integrating SERS enhancement substrates into microfluidic chips,researchers have developed the microfluidic SERS chips which expand the function of microfluidic chips and provide an efficient platform for on-site biochemical analysis equipped with the powerful sensing capability of SERS *** this paper,we will first briefly give a review of the current microfluidic SERS-active substrates preparation technology and present the perspective on the application prospects of microfluidic SERS-active *** then the challenges in the preparation of microfluidic SERS-active substrates will be pointed out,as well as realistic issues of using this technology for biochemical application.

关键词： SERS substrate Microfluidics Biochemical sensing On-site analysis

Effect of radio-frequency substrate bias on ion properties and sputtering behavior of 2 MHz magnetron sputtering

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Plasma Science and Technology 2019年第1期21卷 100-107页

作者： Min ZHU Chao YE Xiangying WANG Amin JIANG Su ZHANG School of Physics Science and Technology Soochow University Key Laboratory of Thin Films of Jiangsu Province Soochow University Medical College Soochow University

The effect of radio-frequency substrate bias on ion properties and sputtering behavior of 2 MHz magnetron discharge was investigated. The ion velocity distribution function(IVDF), the maximum ion energy and ion flux density were measured at the substrate by a retarding field energy analyzer. The sputtering behavior was investigated by the electric characteristics of target and bias discharges using voltage–current probe technique. It was found that the substrate bias led to the decrease of sputtering power, voltage and current with the amplitude substrate bias also led to the broadening of IVDFs and the increase of ion flux density, made the energy divergent of ions impacting the substrate. This effect was further enhanced by increasing bias power and reducing discharge pressure.

关键词： RF magnetron sputtering RF substrate bias ion property electric characteristic

substrate,Hormone,Winnowing,and Stratification Influence the Seed Germination of Ilex asprella(*** Arn.)*** Benth

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Phyton-International Journal of Experimental Botany 2023年第7期92卷 2105-2116页

作者： Yuquan Huang Fan Wei QingMa Yang Lin Jinpeng Huang Yanxia Zhu Danfeng Tang Guangxi Key Laboratory of Medicinal Resources Protection and Genetic Improvement Guangxi Botanical Garden of Medicinal PlantsNanning530000China Research and Development Center China Resources Sanjiu Medical&Pharmaceutical Co.Ltd.Shenzhen518000China

Ilex asprella(*** Arn.)*** Benth is one of the most important traditional Chinese medicines in southern *** seeds of Ilex asprella usually have extremely low germination due to their dormancy characteristics,which severely impacts the efficiency of seedling raising and increases labor *** this study,to improve the seed germination of ***,the effects of germination substrate,hormone,winnowing,and stratification treatments on the seed germination of *** were *** results of the germination matrix showed that the highest germination percentage of 45.2%was achieved under the 20℃/10℃day/night temperature and vermiculite germination medium *** results of hormone treatments revealed that 100–400 mg/L of gibberellin(GA)and 50–100 mg/L of salicylic acid(SA)were found to be effective in releasing the dormancy of *** ***,winnowing could effectively eliminate unsaturated seeds and impurities,thus improving the seed germination of ***,warm temperature(15℃)stratification could expand the temperature range of ***’s seed germination,which was beneficial for seed germination of *** and for seed nursery at room temperature in production *** present study obtained a method to break dormancy and increase seed germination in ***,thereby forming a groundwork for improving the efficiency of large-scale planting of ***.

关键词： Ilex asprella seed germination substrate winnowing hormone stratification

Strategies to improve aerobic granular sludge stability and nitrogen removal based on feeding mode and substrate

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Journal of Environmental Sciences 2019年第10期31卷 144-154页

作者： Quan Yuan Hui Gong Hao Xi Heng Xu Zhengyu Jin Nasir Ali Kaijun Wang State Key Joint Laboratory of Environment Simulation and Pollution Control School of EnuironmentTsinghua Uniuersity

A systemic strategy was proposed to improve aerobic granular sludge(AGS)stability and nitrogen(N)removal efficiency by optimizing feeding mode and substrate aiming at complicated wastewater *** functional groups at the genus level identified by high-throughput sequencing were evaluated as *** results showed that anaerobic feeding mode and acetate promoted the compact AGS formation with excellent total nitrogen(TN)removal efficiency(averaging 91.7%±4.1%)at various dissolved oxygen *** the aerobic feeding mode led to a loose AGS structure with a vulnerable anaerobic core and poor TN removal efficiency(averaging58.8%±7.4%).Simultaneous nitrification and denitrification process played the dominant role in N removal in compact AGS over the alternating nitrification and denitrification ***-concentration glucose undermined feast-famine condition with filamentous bacteria growth out of granule and decreased TN removal efficiency to 67.3%±15.2%.Lower food to microorganism ratio may result in a lower N removal rate attributed to the sharply increased biomass concentration fed by ***-oxidizing bacteria,nitrite-oxidizing bacteria,denitrifying bacteria,and denitrifying phosphorus accumulation organisms enriched during AGS granulation also contributed to the efficient N *** proposed strategy provided insights into the relationship between various factors and stable AGS formation,and systemic operation methods for various complicated wastewater treatment.

关键词： Aerobic granular sludge Feeding mode substrate N removal Stability

Formation and preferred growth behavior of grooved seed silicon substrate for kerfless technology

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Chinese Physics B 2019年第6期28卷 343-348页

作者： Jing-Yuan Yan Yong-Wei Wang Yong-Ming Guo Wei Zhang Cong Wang Bao-Li An Dong-Fang Liu College of Sciences Shanghai UniversityShanghai 200444China Shanghai Advanced Research Institute Chinese Academy of SciencesShanghai 201210China

Kerfless technology is a promising alternative for reducing cost and providing flexible thin crystals in silicon-based semiconductors. In this work we propose a protruded seed substrate technology to prepare flexible monocrystalline Si thin film economically. Grooved seed substrate is fabricated by using SiNx thin film as a mask for the wet-etching and thermal oxidation process. After the SiNx layer on the wedged strip is removed by hot phosphoric acid, the pre-defined structured substrate is achieved with the top of the strip serving as the seed site where there is no oxide layer. And a preferred growth of epitaxial Si on the substrate is performed by introducing an intermittent feed method for silicon source gas. The technique in this paper obviously enhances the mechanical stability of the seed structure and the growth behavior on the seed sites, compared with our previous techniques, so this technique promises to be used in the industrial fabrication of flexible Si-based devices.

关键词： kerfless grooved seed substrate preferred growth

Gas permeation properties of a metallic ion-cross-linked PIM-1 thin-film composite membrane supported on a UV-cross-linked porous substrate

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Chinese Journal of Chemical Engineering 2018年第12期26卷 2477-2486页

作者： Hongyong Zhao Lizhong Feng Xiaoli Ding Xiaoyao Tan Yuzhong Zhang State Key Laboratory of Separation Membranes and Membrane Processes/National Center for International Joint Research on Separation Membranes Tianjin Polytechnic UniversityTianjin 300387China School of Environmental and Chemical Engineering Tianjin Polytechnic UniversityTianjin 300387China Institute of Separation Matenal and Process Control School of Material Science and Engmeering Tianjin Polytechnic UniversityTianjin 300387China

Metallic ion-cross-linked polymer of intrinsic microporosity(PIM-1) thin-film composite(TFC) membranes supported on an ultraviolet(UV)-cross-linked porous substrate were fabricated. The UV-cross-linked porous substrate was prepared via polymerization-induced phase separation. The PIM-1 TFC membranes were fabricated via a dip-coating procedure. Metallic ion-cross-linked PIM-1 TFC membranes were fabricated by hydrolyzing the PIM-1 TFC membrane in an alkali solution and then cross-linking it in a multivalent metallic ion solution. The pore size and porous structures were evaluated by low-temperature N_2 adsorption–desorption analysis. The membrane structure was investigated by field-emission scanning electron microscopy. The effects of heat treatment and pore-forming additives on the gas permeance of the UV-cross-linked porous substrate are reported. The effects of different pre-coating treatments on the gas permeance of the metallic ion-cross-linked PIM-1 TFC membrane are also discussed. The metallic ion-crosslinked PIM-1 TFC membrane displayed high CO_2/N_2 selectivity(23) and good CO_2 permeance(1058 GPU).

关键词： Gas separation Polymerization-induced phase separation UV-cross-linked porous substrate Metallic ion-cross-linked PIM-1TFC membrane

Mild oxidative degradation of spent auricularia auricular substrate and molecular composition of carboxylic acids in the resulting soluble portion

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Chinese Journal of Chemical Engineering 2020年第2期28卷 548-555页

作者： Xiaoli Xue Zhimin Zong Guanghui Liu XianyongWei Key Laboratory of Coal Processing and Efficient Utilization Ministry of EducationChina University of Mining&TechnologyXuzhou 221116China Key Laboratory of Changbai Mountain Animal and Plant Resource Utilization and Protection of Universities in Jilin Province Jilin Agricultural Science and Technology UniversityJilin 132101China State Key Laboratory of High-efficiency Coal Utilization and Green Chemical Engineering Ningxia UniversityYinchuan 750021China

Spent auricularia auricular substrate(SAAS)was oxidatively degraded with aqueous hydrogen peroxide(AHPO)/acetic anhydride(AAH)to produce carboxylic acids(CAs)under mild *** results show that up to 53.6%of the organic matter in SAAS was converted to the soluble species(SSs).In total 122 CAs were detected in the SSs by the analysis with a gas chromatograph/mass spectrometer,which can be classified into 29 group components,mainly being aliphatic acids and along with small amount of aromatic *** the aliphatic acids,normal alkanedioic acids are the most *** detected aromatic acids include benzoic acids,phthalic acids,trimellitic acids,pyromellitic acids,and their *** synergistic oxidation and the released·OH,CH3COO·,and HOO·induced by AHPO/AAH play crucial roles in oxidatively degrading SAAS.

关键词： Spent auricularia auricular substrate Mild oxidation Aliphatic acids Aromatic acids

Direct synthesis of high-quality perovskite nanocrystals on a flexible substrate and deterministic transfer

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Science Bulletin 2018年第23期63卷 1576-1582页

作者： Yilun Wang Xing Cheng Kai Yuan Yi Wan Pan Li Yuhao Deng Haoran Yu Xiaolong Xu Yi Zeng Wanjin Xu Yanping Li Renmin Ma Kenji Watanabe Takashi Taniguchi Yu Ye Lun Dai State Key Laboratory for Artificial Microstructure & Mesoscopic Physics School of PhysicsPeking UniversityBeijing 100871China Collaborative Innovation Center of Quantum Matter Beijing 100871China National Institute for Materials Science 1-1NamikiTsukuba 305-0044Japan

Solid-state perovskite nanocrystals are promising coherent light sources, as there is optical feedback within the crystal structure. In order to utilize the high performance of perovskites for on-chip applications, or observe new physical phenomena, these crystals must be integrated with pre-fabricated electronic or photonic structures. However, the material's fragility has made the deterministic transfer a great challenge thus far. Here, we report the first deterministic transfer of perovskite nanocrystals with sub-micron accuracy. Cesium lead halide(CsPbI_3) nanocrystals were directly synthesized on flexible polydimethylsiloxane(PDMS) stamps via chemical vapor deposition(CVD) and subsequently transferred onto arbitrary substrates/structures. We demonstrated the transfer of a CsPbI_3 crystalline nanoplate(NP)onto an 8 mm fiber core and achieved single-mode whispering gallery mode lasing. Our method can be extended to a variety of other arbitrary substrates(e.g., electrodes, photonic structures, micromechanical systems), laying the foundations for previously unattainable opportunities in perovskites-based devices.

关键词： Deterministic transfer CsPbI3 nanocrystals PDMS substrate CVD

An inverse problem in film/substrate indentation:extracting both the Young's modulus and thickness of films

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Acta Mechanica Sinica 2018年第6期34卷 1061-1071页

作者： Yin Zhang Feifei Gao Zhiyue Zheng Zhihai Cheng State Key Laboratory of Nonlinear Mechanics(LNM) Institute of MechanicsChinese Academy of SciencesBeijing 100190China School of Engineering Science University of Chinese Academy of SciencesBeijing 100049China Department of Physics and Beijing Key Laboratory of Optoelectronic Functional Materials and Micro-Nano Devices Renmin University of ChinaBeijing 100872China

In an indentation test,the effective Young's modulus of a film/substrate bilayer heterostructure varies with the indentation depth,a phenomenon known as the substrate *** previous studies investigating this,only the Young's modulus of the film was *** the effective Young's modulus of a film/substrate structure is determined at a given contact depth,the Young's modulus of the film can be uniquely determined,i.e.,there is a one-to-one relation between the Young's modulus of the film and the film/substrate effective Young's ***,at times it is extremely challenging or even impossible to measure the film ***,the precise definition of the layer/film thickness for a two-dimensional material can be *** the current study,therefore,the thickness of the film and its Young's modulus are treated as two unknowns that must be *** the case with one unknown,there are infinite combinations of film thickness and Young's modulus which can yield the same effective Young's modulus for the film/*** inverse problem is formulated and solved to extract the Young's modulus and thickness of the film from the indentation depth-load *** accuracy and robustness of the inverse problem-solving method are also demonstrated.

关键词： Indentation test Film substrate Inverse problem