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Effects of structure and electronic properties of D-π-A organic dyes on photovoltaic performance of dye-sensitized solar cells

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Journal of Energy Chemistry 2021年第3期30卷 208-216页

作者： Min-woo Lee Jae-Yup kim hyung-Geun Lee Hyun Gil Cha Duck-hyung Lee Min Jae Ko Bio-Based Chemistry Research Center Advanced Convergent Chemistry DivisionKorea Research Institute of Chemical Technology(KRICT)Ulsan 44429Republic of Korea Department of Chemical Engineering Dankook UniversityYongin 16890Republic of Korea Department of Chemistry Sogang UniversitySeoul 04107Republic of Korea Department of Chemical Engineering Hanyang UniversitySeoul 04763Republic of Korea Institute of Nano Science and Technology Hanyang UniversitySeoul 04763Republic of Korea

Herein,we examine the performance of dye-sensitized solar cells containing five D-π-A organic dyes designed by systematic modification of π-bridge size and geometric *** dye has a simple push-pull structure with a triarylamino group as an electron donor,bithiophene-4,4-dimethyl-4 H-cyclopenta 1,2-b:5,4-b’]dithiophene(M11),4,4-dimethyl-4 H-cyclopenta[1,2-b:5,4-b’]dithiophenethiophene(M12),thiophene-4,4-dimethyl-4 H-cyclopenta[1,2-b:5,4-b’]dithiophene(M13),4,4-dimethyl-4 H-cyclopenta[1,2-b:5,4-b’]dithiophene-benzene(M14),and 4,4-dimethyl-4 H-cyclopenta[1,2-b:5,4-b’]dithiophene(M15)units asπ-bridges,and cyanoacrylic acid as an electron acceptor/*** extension of theπ-bridge linkage favors wide-range absorption but,because of the concomitant molecular volume increase,hinders the efficient adsorption of dyes on the TiO_(2) film ***,higher loadings are achieved for smaller dye molecules,resulting in(i)a shift of the TiO_(2) conduction band edge to more negative values,(ii)a greater photocurrent,and(iii)suppressed charge recombination between the photoanode and the redox couple in the ***,under one-sun equivalent illumination(AM 1.5 G,100 mW/cm^(2)),the highest photovoltage,photocurrent,and conversion efficiency(η=7.19%)are observed for M15,which has the smallest molecular volume among M series dyes.

关键词： Dye-sensitized solar cells Donor-acceptor dyes Electron-rich unit Wide-range absorption Impedance spectroscopy

Characterization and sensor application of cellulose electro-active paper (EAPap)

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Chinese Science Bulletin 2009年第15期54卷 2703-2707页

作者： LEE Sang-woo kim Joo-hyung kim Jaehwan kim Heung Soo Creative Research Center for EAPap Actuator Mechanical Engineering Department Inha University School of Mechanical and Automotive Engineering Catholic University of Daegu

As a novel piezoelectric material, the mechanical and piezoelectric properties of cellulose electro-active paper (EAPap) were studied. Young's modulus of piezoelectric EAPap was dependant on the material orientation as compared with other EAP materials. The highest Young's modulus was obtained at 0° direction, while the highest direct piezoelectric charge constant was achieved at 45°. By measuring the induced output voltage from the thin piezoelectric cellulose film under the applied impact force, we demonstrate that piezoelectric EAPap film has a potential for sensor applications.

关键词：传感器应用纤维素膜压电材料表征杨氏模量压电性能电子机械输出电压

Electrically controlled mRNA delivery using a polypyrrolegraphene oxide hybrid film to promote osteogenic differentiation of human mesenchymal stem cells

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Nano Research 2022年第10期15卷 9253-9263页

作者： Huijung kim Kübra Solak Yoojoong Han Yeon-woo Cho Kyeong-Mo Koo Chang-Dae kim Zhengtang Luo hyungbin Son hyung-Ryong kim Ahmet Mavi Tae-hyung kim School of Integrative Engineering Chung-Ang University84 Heukseuk-roDongjak-guSeoul 06974Republic of Korea Department of Nanoscience and Nanoengineering Graduate School of Natural and Applied SciencesAtatürk UniversityErzurum 25240Turkey Department of Chemical and Biological Engineering Hong Kong University of Science and TechnologyKowloonHong Kong 999077China Department of Pharmacology College of DentistryJeonbuk National UniversityJeonju 54896Republic of Korea Department of Nanoscience and Nanoengineering Institute of ScienceAtatürk UniversityErzurum 25240Turkey Department of Mathematics and Science Education Education Faculty of Kazım KarabekirAtatürk UniversityErzurum 25240Turkey

Direct messenger ribonucleic acid(mRNA)delivery to target cells or tissues has revolutionized the field of ***,the applicability of regenerative medicine is limited by the technical difficulties of various mRNA-loaded ***,we report a new conductive hybrid film that could guide osteogenic differentiation of human adipose-derived mesenchymal stem cells(hADMSCs)via electrically controlled mRNA *** find optimal electrical conductivity and mRNAloading capacity,the polypyrrole-graphene oxide(PPy-GO)hybrid film was electropolymerized on indium tin oxide *** found that the fluorescein sodium salt,a molecule partially mimicking the physical and chemical properties of mRNAs,can be effectively absorbed and released by electrical stimulation(ES).The hADMSCs cultivated on the PPy-GO hybrid film loaded with pre-osteogenic mRNAs showed the highest osteogenic differentiation under electrical *** platform can load various types of RNAs thus highly promising as a new nucleic acid delivery tool for the development of stem cell-based therapeutics.

关键词： messenger ribonucleic acid(mRNA)delivery polypyrrole graphene oxide electrical release mesenchymal stem cells

Distribution of electric field for carbon nanotube assembly: Simulation (I)

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Transactions of Nonferrous Metals Society of China 2011年第A1期21卷 117-120页

作者： Soon-Geun KWON Soo-Hyun kim Kwang-Ho kim Myung-Chang KANG hyung-woo LEE Department of Mechanical Engineering Korea Advanced Institute of Science and Technology (KAIST) Daejeon 305-701 Korea National Core Research Center for Hybrid Materials Solution Pusan National University

The distribution of electric field for the alignment and attachment of carbon nanotubes (CNTs) was simulated. To be attached at the desired place, the aligned and attracted CNTs should be stayed in the desired area called the stable region or the quasi-stable region for an instant where the change of electric field is minimized. Since the conical electrode has the very narrow sized quasi-stable region, few CNTs can be attached. The rectangular electrodes have a wide stable region, so lots of CNTs can be attached. The results indicate that the round electrode which has a proper sized quasi-stable region is more effective for aligning and attaching a single CNT than the conical or rectangular shaped electrodes.

关键词： carbon nanotubes (CNTs) dielectrophoresis (DEP) round shaped electrode simulation

A Furan-Substituted Polymeric Hole-Transporting Material for Energy Level Regulation and Less Planarity in Colloidal Quantum Dot Solar Cells

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Energy & Environmental Materials 2023年第5期6卷 340-346页

作者： Jun woo Lee Duck Hoon Lee Younghoon kim Jin Young Park hyung Ryul You Taiho Park Minjun kim Jongmin Choi Department of Chemical Engineering Pohang University of Science and Technology(POSTECH)77 Cheongam-RoNam-GuPohang Gyeongbuk 37673Korea Department of Chemical and Environmental Engineering Yale UniversityNew Haven CT 06511USA Department of Energy Science and Engineering Daegu Gyeongbuk Institute of Science and Technology(DGIST)Daegu 42988Korea Department of Chemistry Kookmin UniversitySeoul 02707Korea RIKEN Center for Emergent Matter Science(CEMS) 2-1 HirosawaWako Saitama 351-0198Japan

For efficient colloidal quantum dot(CQD)solar cells(CQD-SCs),thiol-passivated p-type CQDs are generally used as a hole-transporting material(HTM);however,there are issues with the control of optoelectrical properties,low thiol passivation rate,and poor morphology with a power conversion efficiency(PCE)of approximately 11%.Although polymeric HTMs have been introduced to address these issues,maximizing efficiency and achieving green-solvent processability and thermal stability for commercialization is ***,we synthesize a novel benzodifuran(BDF)-based HTM(asy-ranPBTBDF)showing an electron-deficient state,low steric hindrance,and low planarity compared to those of a typical benzodithiophene(BDT)-based HTM(asy-ranPBTBDT).BDF properties lead to deep high occupied molecular orbital(HOMO)levels,closeπ-πstacking,excellent solubility,and amorphous properties related to efficiency,green-solvent processability,and thermal *** these benefits,the asy-ranPBTBDF-based CQD-SC showed enhanced open-circuit voltage(Voc)(0.65 V)and PCE(13.29%)compared to those of the asy-ranPBTBDT-based device(0.63 V and 12.22%)in toxic processes with *** asy-ranPBTBDF-based CQD-SC showed a PCE of 12.51%in a green-solvent process with 2-methylanisole and improved thermal stability at 80℃(83.8%retaining after 24 h)owing to less lateral crystallization than the asy-ranPBTBDT-based device(60.8%retaining after 24 h).

关键词： colloidal quantum dot green-solvent photovoltaics semiconducting polymers stability

Highly efficient and stable solid-state fiber dye-sensitized solar cells with Ag-decorated SiO_(2) nanoparticles

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Nano Research 2021年第8期14卷 2728-2734页

作者： Jae Ho kim Seok-Ju Yoo Daseul Lee Jin woo Choi Sang-Cheol Han Tae In Ryu hyung woo Lee Myunghun Shin Myungkwan Song Materials Center for Energy Convergence Korea Institute of Materials Science(KIMS)797Changwon-daeroSungsan-guChangwonGyeongsangnam-do51508Republic of Korea CEN Nano.Co.Ltd. Nano Convergence CenterMuan-roBuduk-myeonMiryang-siGyeongsangnam-do50404Republic of Korea Accident Coordination and Training Division National Institute of Chemical Safety(NICS)90Gajeongbuk-roYuseong-guDaejeon34114Republic of Korea Department of Nanoenergy Engineering and Research Center of Energy Convergence Technology Pusan National UniversityBusandaehak-ro 63-2Geumjeong-guBusan 46241Republic of Korea School of Electronics and Information Engineering Korea Aerospace University Goyang-cityGyeonggi-do10540Republic of Korea

Fiber-shaped dye-sensitized solar cells(FDSSCs)represent promising futuristic flexible or wearable power sources,owing to their simple fabrication process,light weight,weavability,and *** with strategies on changing the properties of semiconductor materials,the effects of incorporating silver-embedded SiO_(2) nanoparticles(Ag@SiO_(2)NPs)on the photoanodes of solid-state FDSSCs(SS-FDSSCs)are *** power conversion efficiency(PCE)of SS-FDSSCs with Ag@SiO_(2) NPs reaches 5.38%,which is comparable to the reference(3.98%).The PCEs remain at 95%between-16.9 and 91.7℃,indicating the operational stability of SS-FDSSCs within this temperature *** fabricated SS-FDSSCs,whose radii were 2 mm,maintains more than 90%of their efficiency over 500 bending cycles and 10 washing cycles.

关键词： dye-sensitized solar cells fiber-shaped solar cells SiO_(2)nanoparticles plasmonic effect solid-state electrolyte

Outcome after gastrectomy in gastric cancer patients with type 2 diabetes

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World Journal of Gastroenterology 2012年第1期18卷 49-54页

作者： Jong Won kim Jae-Ho Cheong woo Jin hyung Seung-Ho Choi Sung Hoon Noh Department of Surgery Gangnam Severance Hospital Yonsei University College of Medicine Department of Surgery Severance Hospital Yonsei University College of Medicine

AIM: To evaluate the prognosis of type Ⅱ diabetes mellitus (T2DM) after gastrectomy and related factors in gastric cancer patients. METHODS: 403 gastric cancer patients with T2DM were studied, who underwent gastrectomy between May 2003 and September 2009. A review of medica records and telephone interviews was performed in this cross-sectional study. The factors included in the statistical analysis were as follows: gender, age, type of surgery, preoperative body mass index (BMI), current BMI, BMI reduction ratio, preoperative insulin or oral diabetic medicine requirement, follow-up duration, and current state of diabetes. Assessment of diabetes status after surgery was classified into four categories according to the change in hypoglycemic agents after surgery and present status of T2DM: resolution, improvement, same, and worse.(± 20.6 mo), preoperative BMI was 24.7 kg/m2 (± 3.0 kg/m2), and BMI reduction ratio was 9.8% (± 8.6%). After surgery, T2DM was cured in 58 patients (15.1%) and was improved in 117 patients (30.4%). According to the type of surgery, the BMI reduction ratio was signif icantly higher in the total gastrectomy and Roux-en-Y reconstruction group [14.2% ± 9.2% vs 9.2% ± 7.7% (Billroth Ⅱ group), P < 0.001] and signif icantly lower in the subtotal gastrectomy and Billroth Ⅰ reconstruction group [7.6% ± 8.0%, 9.2% ± 7.7% (Billroth Ⅱ group), P < 0.001]. The BMI reduction ratio, follow-up duration after surgery, type of surgery, extent of gastrectomy, and performance of duodenal bypass were signif icantly correlated to the course of T2DM (P < 0.05). The BMI reduction ratio was the most influential factor on T2DM status. In a subgroup analysis of patients with a BMI reduction ratio of 10% or less (n = 206), T2DM was cured in 15 (7.6%) patients and was improved in 57 (28.8%) patients after surgery, and only the duration of surgery was signif icantly correlated to T2DM status (P = 0.022).

关键词： Gastric cancer Diabetes mellitus Metabolic surgery Bariatric surgery

Laparoscopic cholecystectomy in patients with anesthetic problems

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World Journal of Gastroenterology 2013年第29期19卷 4832-4835页

作者： Bum-Soo kim Sun-hyung Joo Jin-Hyun Joh Jae-woo Yi Department of Surgery School of Medicine Kyung Hee University Seoul 134-727 South Korea Departments of Surgery and Anesthesiology and Pain Medicine School of Medicine Kyung Hee University Seoul 134-727 South Korea

Laparoscopic cholecystectomy is a standard operation for benign gallbladder disease. As experience with laparoscopic cholecystectomy has increased, the procedure has become possible in patients with anesthetic problems. Patients with ankylosing spondylitis or severe kyphosis represent a challenging group to anesthesiologists and laparoscopic surgeons since these diseases are associated with difficult intubation, restrictive ventilatory defects, and cardiac problems. The relatively new approach of awake fiberoptic intubation is considered to be the safest option for patients with anticipated airway difficulties. Laparoscopic cholecystectomy is usually performed under general anesthesia but considerable difficulties in anesthetic management are encountered during laparoscopic surgery; for example, hemodynamic instability may develop in patients with cardiopulmonary dysfunction due to pneumoperitoneum and position changes during the operation. Nonetheless, regional anesthesia can be considered as a valid option for patients with gallbladder disease who are poor candidates for general anesthesia due to cardiopulmonary problems. We report three cases of laparoscopic cholecystectomy successfully performed in patients with anesthetic problems that included cardiopulmonary disease, severe kyphosis, and ankylosing spondylitis.

关键词： Laparoscopic cholecystectomy Kyphosis Ankylosing spondylitis Anesthetic problems

Treatment outcome of localized Helicobacter pylori-negative low-grade gastric MALT lymphoma

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World Journal of Gastroenterology 2010年第17期16卷 2158-2162页

作者： hyung Soon Park Yu Jin kim woo Ick Yang Chang Ok Suh Yong Chan Lee Department of Internal Medicine Yonsei University College of Medicine120-752 SeoulSouth Korea Department of Pathology Yonsei University College of Medicine120-752 SeoulSouth Korea Department of Radiation Oncology Yonsei University College of Medicine120-752 SeoulSouth Korea

AIM: To investigate treatment outcome of Helicobacter pylori (*** )-negative low-grade gastric mucosaassociated lymphoid tissue (MALT) ***: In this study,we retrospectively reviewed the clinical outcome and clinicopathologic factors of stage Ⅰ E *** -negative low-grade gastric MALT lymphoma cases from August 1998 to June ***: A total of eleven patients with *** -negative low-grade gastric MALT lymphoma were enrolled in the study and received *** eradication treatment and/or radiotherapy or excisional *** remission (CR) of gastric MALT lymphoma was achieved in all *** time to CR was 1-66 mo (median,1 mo).CONCLUSION: Eradication therapy may be offered as an initial treatment option even in cases of localized *** -negative gastric MALT lymphoma.

关键词： Anti-bacterial agents Helicobacter pylori Mucosa-associated lymphoid tissue lymphoma Radiotherapy Stomach