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Nan Gao, Xiaochen Lin, Jinglin Liu, Yuanzuo Li, Yanhui Yang
This paper theoretically simulated (using DFT and TD-DFT in N,N-dimethylformamide (DMF) solvent) the photodynamic properties of three non-metallic dye molecules with D-π-A₁-π-A₂ structure. The total photoelectric conversion efficiency (PCE) could be evaluated by the following parameters: the geometric structures, the electronic structures, and the absorption spectra, the analyses of charge difference density (CDD) and natural bond orbitals (NBO), the analyses of ionization potential (IP) and electron affinity (EA) from electronic contribution capacity, the reorganization energies (λh, λe, and λtotal), and the chemical reaction parameter (h, ω , ω-, and ω+) for intramolecular charge transfer (ICT) processing, the excited lifetime (τ) and the vertical dipole moment (μnormol)...
October 18, 2018: Materials
Cong Shen, Qiao Zhou, Meiyu Zhao, Xuemei Lu, Peng Song
Photoinduced electron transfers in different conjugated donor polymer containing with PC60 BM as the acceptor (X3:PC60 BM and X6:PC60 BM) were theoretically investigated. A detailed theoretical analysis of Marcus electron transfer rate in an external electric field was also performed. By discussing the effect of electric field on ΔG, λ, VDA and charge separation rate, we have come to some conclusions. The results reveal that the free energy change and electronic coupling matrix are significantly influence by the vector properties of external electric field...
October 15, 2018: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
Ruyi Wang, Xiaodong Li, Lu Wang, Xirui Zhao, Guangcheng Yang, Aidong Li, Congping Wu, Qing Shen, Yong Zhou, Zhigang Zou
ZnO/CdS-based nanorod arrays (NRs) are an excellent class of photoanode materials, which possess high photoelectric response for solar-driven water splitting. A highly efficient photoanode system consisting of Al-doped ZnO NRs as effective electron-transfer layers and CdS as a light harvesting layer was rationally designed. Al doping increased the conductivity of ZnO NRs and simultaneously coarsened the surface of ZnO due to expansion of ZnO lattice. The rough surface favoured the growth of a CdS coating layer on it through a successive ionic layer adsorption reaction...
October 16, 2018: Nanoscale
Michael Weißl, Thomas Rath, Jürgen Sattelkow, Harald Plank, Samuel Eyley, Wim Thielemans, Gregor Trimmel, Stefan Spirk
A generic procedure for the manufacturing of cellulose-metal sulfide multilayered sandwich type thin films is demonstrated at the example of copper indium sulfide. These multilayers were created by alternate spin coating steps of precursors, followed by their conversion using either acidic vapors, or heat treatment. As precursors, cellulose xanthate, a widely available cellulose derivative employed in viscose fiber manufacturing and commercial copper and indium xanthates were used. After conversion of the single layers into cellulose and copper indium sulfide, the film properties (structure, thickness, photoelectric activity) of the single and multilayer systems consisting of alternate layers of cellulose and copper indium sulfide were studied...
January 1, 2019: Carbohydrate Polymers
Xiaowan Li, Yingcheng Hu
A facile and robust strategy is required to fabricate films with highly photoluminescent for application in the field of anti-counterfeit marking. Here we report a kind of multifunctional bio-nanocomposite film with CdTe quantum dots (QDs) decorated with cellulose nanofibrils (CNFs). In this work, CNFs were introduced as nanothin film matrix, and crosslinking modification with EDC/NHS through covalent binding was used to introduce the CdTe QDs to prepare the nanoscale TEMPO-CNF/CdTe QDs nanocomposite material with uniform distribution, controllable particle size and good photoelectric properties...
January 1, 2019: Carbohydrate Polymers
Lijing Wang, Nannan Chen, Gan Jin, Tanglue Feng, Xiaohang Du, Fangyuan Liu, Henan Sun, Bai Yang, Haizhu Sun
Water soluble nanocrystals (NCs) are promising materials in aqueous-processed solar cells because of their high extinction coefficient, low-cost, and favorable photoelectric characteristics. However, the power conversion efficiency (PCE) of the present aqueous-processed NC solar cells is restricted by the short depletion region of the active layer and limited Fermi level offset between NCs and the electron transport layer. Herein, these issues are effectively addressed by preparing Cdx Zn1- x Te NCs capped with 2-aminoethanethiol hydrochloride...
October 11, 2018: Small
Pengjun Zhao, Byeong Jo Kim, Xiaodong Ren, Dong Geon Lee, Gi Joo Bang, Jae Bum Jeon, Won Bin Kim, Hyun Suk Jung
Photovoltaic technologies based on perovskite absorber materials have led this optoelectronic field into a brand-new horizon. However, the present antisolvents used in the one-step spin-coating method always encounter problems with the very narrow process window. Herein, anisole is introduced into the one-step spin-coating method, and the technology is developed to fabricate perovskite thin films with ultrawide processing window with a dimethylformamide (DMF):dimethyl sulfoxide (DMSO) ratio varying from 6:4 to 9:1 in the precursor solution, anisole dripping time ranging from 5 to 25 s, and an antisolvent volume varying from 0...
October 10, 2018: Advanced Materials
Xianjun Zhu, Taiming Zhang, Daochuan Jiang, Hengli Duan, Zijun Sun, Mengmeng Zhang, Hongchang Jin, Runnan Guan, Yajuan Liu, Muqing Chen, Hengxing Ji, Pingwu Du, Wensheng Yan, Shiqiang Wei, Yalin Lu, Shangfeng Yang
Few-layer black phosphorus (BP) with an anisotropic two-dimensional (2D)-layered structure shows potential applications in photoelectric conversion and photocatalysis, but is easily oxidized under ambient condition preferentially at its edge sites. Improving the ambient stability of BP nanosheets has been fulfilled by chemical functionalization, however this functionalization is typically non-selective. Here we show that edge-selective functionalization of BP nanosheets by covalently bonding stable C60 molecules leads to its significant stability improvement...
October 9, 2018: Nature Communications
Baoqing Liu, Xuefei Lu, Ze Qiao, Liping Song, Qian Cheng, Jiawei Zhang, Afang Zhang, Youju Huang, Tao Chen
Two-dimensional (2D) gold nanoparticle (Au NP) monolayer film possesses a lot of fascinating peculiarities, and has shown promising applications in photoelectrical device, catalysis, spectroscopy, sensor and anti-counterfeiting. Due to localized surface plasmon resonance (LSPR) property predetermined by the nature structure of metal nanoparticle, it is usually difficult to realize reversible LSPR transition of 2D film. In this work, we report on fabrication of a large-area free-standing Au NP monolayer film with dual-responsive switchable plasmonic property using a pH- or thermal-responsive dendronized copolymer as stimuli-sensitive linker between neighbored NPs...
October 9, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Qianwen Liu, Mengdi Wang, Yishan He, Xuxu Wang, Wenyue Su
A series of amorphous Co-P alloy modified ZnIn2S4 composite samples were synthesized through a one-step photochemical method. The as-prepared samples were systematically characterized and the photocatalytic activity for H2 production under visible-light irradiation was investigated. It was found that the Co-P/ZnIn2S4 composite samples exhibited higher photocatalytic activity, which is 44 times higher than that of pure ZnIn2S4 and higher than that of the 1 wt% Pt/ZnIn2S4 sample. After modifying with amorphous Co-P alloy, the composite samples showed enhanced photocurrent, reduced photoelectric impedance, weakened fluorescence intensity and extended fluorescence lifetime, which accelerate the separation and transfer of photoinduced charge effectively, thus improving the catalytic activity of the composite sample...
October 18, 2018: Nanoscale
W G Xie
Effects of non-operative therapies for scar are very limited, and operative treatments are also often difficult to get satisfactory results. Safe, effective, simple, and feasible therapy for scar is urgently needed in clinic. Laser has been used for scar treatment for more than 30 years. There are many kinds of lasers, many of which have been reported to be used for scar treatment. Laser and related photoelectric therapies for scar have experienced long period of exploration, from the initial laser of continuous wavelength to the later pulsed laser, from ordinary spot laser in the early period to the present fractional laser...
September 20, 2018: Zhonghua Shao Shang za Zhi, Zhonghua Shaoshang Zazhi, Chinese Journal of Burns
(no author information available yet)
Traumatic scars not only affect local appearance and function, but also may be accompanied by pain, itching, and even psychological problems, which seriously affect the quality of patients' life. The prevention and treatment of scars are still quite challengeable for plastic and cosmetic surgery. Recently, photoelectric therapy and radio-frequency technology have brought breakthroughs in the clinical prevention and treatment of traumatic scars due to the developments of theory and practice on selective photothermolysis and fractional photothermolysis...
September 20, 2018: Zhonghua Shao Shang za Zhi, Zhonghua Shaoshang Zazhi, Chinese Journal of Burns
Yutaka Yoshida, Emi Yuda, Kiyoko Yokoyama, Junichiro Hayano
In this study, we examined whether or not the strenuous exercise in the evening change nocturnal heart rate variability (HRV) and recovers. Subjects were 8 healthy men belonging to the mature futsal team (age: 35±3 years) and Futsal was held from 5:00 p.m. to 6:30 p.m. on Sunday. Pulse waves during sleeping were measured at home on exercise day and on control day. The mean pulse interval (MPI), standard deviation pulse interval (SDPI), low frequency component (LF, 0.04-0.15 Hz), high frequency component (HF, 0...
August 2018: Journal of Exercise Rehabilitation
Xiaojiao Yu, Song Kou, Junkun Nie, Jian Zhang, Yuchen Wei, Jinfen Niu, Binghua Yao
A constant current electrodeposition approach was employed to prepare Cu2 O/TiO2 nanocomposite thin film. X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), Raman, ultraviolet visible light spectrophotometer (UV-Vis), and photoluminescence (PL) measurements were used to characterize and analyze the thin film microstructure, surface morphology, and photoelectric properties. The effect of annealing treatment on the thin film properties is discussed. The response surface methodology (RSM) was employed to optimize the Rhodamine B (RhB) photocatalytic degradation by thin films, and the quadratic multinomial mathematical model was established...
September 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
Songjie Du, Lin Jing, Xiaohua Cheng, Ye Yuan, Jianxu Ding, Tianliang Zhou, Xiaoyuan Zhan, Hongzhi Cui
Organic-inorganic hybrid methylammonium lead iodide perovskite (MAPbI3 ) has attracted extensive attention in a series of optoelectronic devices. The photoelectric properties of the MAPbI3 single crystal have been revealed to be much better than those of it polycrystalline counterparts. However, its poor moisture and heat resistance severely limited further development. The introduction of Cs+ into polycrystalline films has shown to be an effective way to enhance its moisture resistance through a passivation effect...
October 4, 2018: Journal of Physical Chemistry Letters
Zheng Yang, Qian Xu, Xiandi Wang, Junfeng Lu, Hui Wang, Fangtao Li, Li Zhang, Guofeng Hu, Caofeng Pan
Stability is a key problem that hinders the practical application of lead halide perovskite. Therefore, all-inorganic perovskite CsPbX3 monocrystalline films are urgently needed to fabricate photoelectric devices. Herein, a low-temperature and substrate-independent growth method is demonstrated to grow millimeter-level inorganic perovskite monocrystalline thin films. These films present good optical and electrical properties comparable to bulk ones. What is more, they exhibit excellent long-term stability toward humidity and thermal treatment...
September 24, 2018: Advanced Materials
Yulu Chen, Zuoru Dong, Bingbing Wang, Zuimin Jiang, Xiaodong Wang
In this work, the photoelectric response properties of the graphene/GeSi QDs hybrid structure were demonstrated by measuring the I-V curve, and the incident photon-to-current conversion efficiency (IPCE). The maximal on-off ratio of the current value reaches 1500 at 10K, due to the competition between the carrier freeze-out effect and the recombination center effect. The IPCE of the hybrid structure under different incident light indicated that the photoelectric response of hybrid structure is most sensitive to the ultraviolet light (325nm), which is attributed to the enhanced ultraviolet absorption of graphene surface plasmon in the hybrid structure...
September 24, 2018: Nanotechnology
Peng Li, Zhun Bao, Guanghui Wang, Pengfei Xu, Xuegang Wang, Zhipeng Liu, Yadan Guo, Jing Deng, Weimin Zhang
The development of ultra-efficient, sustainable, and easily accessible anode with relative non-precious semiconducting metal oxides is highly significant for application in the practical treatment of organically polluted water. Herein, we report SnO2 , TiO2 , and Ag2 O ternary semiconductor metal oxide blend grafted Ag@AgCl hybrids, prepared with the one-step sol-gel method and applied as a dimensionally stable anode (DSA)-active layer on a SnO2 -Sb/Ti electrode. Factors affecting crystal formation, including the presence or absence of O2 during calcination, the calcination temperature, and Ag@AgCl additive dosage were discussed...
January 15, 2019: Journal of Hazardous Materials
Keisaku Fujimoto, Haruna Yamazaki, Akikazu Uematsu
Objective/background: This study was performed to evaluate the association of nocturnal autonomic nerve (AN) dysfunction, especially parasympathetic nerve (PN) function instability, and nocturnal oxygen desaturation (NOD) in patients with chronic lung diseases (CLD). Patients and methods: Twenty-nine stable CLD patients with irreversible pulmonary dysfunction and mild-to-moderate daytime hypoxemia, 13 CLD patients receiving long-term oxygen therapy (LTOT) with maintained SpO2 >90%, and 17 senior healthy volunteers underwent two-night examinations of nocturnal AN function by pulse rate variability (PRV) instead of heart rate variation using a photoelectrical plethysmograph simultaneously monitoring SpO2 and the presence of sleep disordered breathing at home...
2018: International Journal of Chronic Obstructive Pulmonary Disease
M Ossiander, J Riemensberger, S Neppl, M Mittermair, M Schäffer, A Duensing, M S Wagner, R Heider, M Wurzer, M Gerl, M Schnitzenbaumer, J V Barth, F Libisch, C Lemell, J Burgdörfer, P Feulner, R Kienberger
Photoemission spectroscopy is central to understanding the inner workings of condensed matter, from simple metals and semiconductors to complex materials such as Mott insulators and superconductors1 . Most state-of-the-art knowledge about such solids stems from spectroscopic investigations, and use of subfemtosecond light pulses can provide a time-domain perspective. For example, attosecond (10-18 seconds) metrology allows electron wave packet creation, transport and scattering to be followed on atomic length scales and on attosecond timescales2-7 ...
September 2018: Nature
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