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Weixin Ouyang, Longxing Su, Xiaosheng Fang
A facile chemical bath method is adopted to grow bismuth oxychloride (BiOCl) nanosheet arrays on a piece of Cu foil (denoted as BiOCl-Cu) and isolated BiOCl nanosheets are collected by ultrasonication. A self-supporting BiOCl film is obtained by the removal of Cu foil. Photodetectors (PDs) based on these BiOCl materials are assembled and the effects of morphologies and electrode configurations on the photoelectric performance of these PDs are examined. The BiOCl nanosheet PD achieves high responsivities in the spectral range from 250 to 350 nm, while it presents quite a small photocurrent and slow response speed...
August 9, 2018: Small
Miriding Mutailipu, Min Zhang, Hongping Wu, Zhihua Yang, Yihan Shen, Junliang Sun, Shilie Pan
Nonlinear optical (NLO) materials are the vital components of future photoelectric technologies as they can broaden the tunable wavelength range supplied by common laser sources. However, the necessary prerequisites for a practical NLO material are rather strict. Accordingly, considerable efforts have been focused on finding potential NLO materials. Here we report two asymmetric beryllium-free borates Pna21 - and P[Formula: see text]2m-Ba3 Mg3 (BO3 )3 F3 featuring NLO-favorable 2 ∞ [Mg3 O2 F3 (BO3 )2 ] layered structures...
August 6, 2018: Nature Communications
Yunzhou Xue, Jian Yuan, Jingying Liu, Shaojuan Li
Perovskites have recently attracted intense interests for optoelectronic devices application due to their excellent photovoltaic and photoelectric properties. The performance of perovskite-based devices highly depends on the perovskite material properties. However, the widely used spin-coating method can only prepare polycrystalline perovskite and physical vapor deposition (PVD) method requires a higher melting point (>350 °C) substrate due to the high growth temperature, which is not suitable for low melting point substrates, especially for flexible substrates...
August 3, 2018: Nanomaterials
Kai Yan, Yuhan Zhu, Weihao Ji, Fang Chen, Jingdong Zhang
Artificial photocatalytic systems have been extensively established to mimic the natural solar-energy conversion process for developing useful photoelectric devices. In this work, a membraneless, hydrogen peroxide (H2O2)-based photocatalytic fuel cell (PFC) operated under visible light was proposed and applied in self-powered sensing of 3,3',4,4'-tetrachlorobiphenyl (PCB77). The PFC was comprised of a photoanode fabricated with gold nanoparticles-decorated graphitic C3N4 nanosheet and a cathode modified with hemin-graphene nanocomposites...
August 3, 2018: Analytical Chemistry
Rongjie Zhang, Zhijian Xie, Chunhua An, Shuangqing Fan, Qiankun Zhang, Sen Wu, Linyan Xu, Xiaodong Hu, Daihua Zhang, Dong Sun, Jianhao Chen, Jing Liu
Efficient modulation of carrier concentration is of fundamental importance for tailoring the electronic and photoelectronic properties of semiconducting materials. Photo-induced doping is potentially a promising way to realize such a goal for atomically thin nanomaterials in a rapid and defect-free manner. However, the wide applications of photo-induced doping in nanomaterials are severely constrained by the low doping concentration and poor stability that it can reach. Here, we propose a novel photo-induced doping mechanism based on external photoelectric effect of metal coating on nanomaterials to significantly enhance the achievable doping concentration and stability...
July 31, 2018: ACS Applied Materials & Interfaces
Zhiliang Zhang, Tiantian Si, Jun Liu
In this work, an effective and facile strategy was developed to assemble a flexible hierarchical multiscale architecture by incorporating microscale silver nanoparticles (AgNPs) grids into random silver nanowires (AgNWs) networks combined with a room-temperature chemical sintering process. The microscale AgNPs grids was fabricated by assemble AgNPs into a series of twin lines directly on a hydrophilic PET substrate based on coffee-ring effect with inkjet printing technique. By regulating the assembly architecture, a flexible hierarchical multiscale conductor based on AgNPs grids/AgNWs was successfully fabricated and demonstrated a high transmittance of 87...
July 30, 2018: Nanotechnology
Wei Yang, Kai Hu, Feng Teng, Junhui Weng, Yong Zhang, Xiaosheng Fang
A gold-induced NH4Cl-assisted vapor-based route is proposed and developed to achieve vertically aligned Se sub-micro crystals on lattice-matched (111)-oriented silicon substrates, based on which a high-performance large-area silicon-compatible photodetector is constructed. Thanks to the energy band structure and the strongly asymmetrical depletion region, the fabricated Se/Si device maintains similar wavelength cut-off to that of selenium devices before IR region, along with high-performance broadband photo response in UV-to-visible region...
July 27, 2018: Nano Letters
L Benatto, C F N Marchiori, M G E da Luz, M Koehler
Through theoretical analysis, we study relevant properties of some molecular structures formed by oligothiophenes (T) and dioctylfluorenes (F) units, commonly employed in the fabrication of different kinds of optical and electronic devices. For so, we first consider F-(T)n-F molecules with different numbers of thiophene rings (n). Among other characteristics, we calculate the dipole moment change between the ground and excited state (Δμge), a quantity that greatly influences the exciton dissociation and charge carrier mobility...
August 8, 2018: Physical Chemistry Chemical Physics: PCCP
Xiangyang Liu, Shun Wang, Haiwu Zheng, Xiuying Cheng, Yuzong Gu
Correction for 'Comprehensive insights into the charge dynamics process and excellent photoelectric properties of heterojunction solar cells' by Xiangyang Liu et al., Phys. Chem. Chem. Phys., 2016, 18, 24299-24306.
August 1, 2018: Physical Chemistry Chemical Physics: PCCP
Jinhui Feng, Faying Li, Xiaojian Li, Yaoguang Wang, Dawei Fan, Bin Du, Yueyun Li, Qin Wei
A new, photoelectrochemical immunosensor was proposed on the basis of the La-CdS/3D ZnIn2 S4 /Au@ZnO sensitization structure for detection of aminoterminal pro-brain natriuretic peptides (NT-proBNP). The Au@ZnO-modified electrode was first assembled with 3D ZnIn2 S4 , and then further deposited with lanthanum doped cadmium sulfide (La-CdS) via successive ionic layer adsorption and reaction strategy. The Au@ZnO has excellent photoelectric activity and electrical conductivity. The ZnIn2 S4 with 3D architectures not only exhibit high photocurrent intensity under visible-light irradiation but also have large surface for the La-CdS deposition...
October 15, 2018: Biosensors & Bioelectronics
Diya Alsafadi, Fawwaz I Khalili, Hassan Juwhari, Bashar Lahlouh
Bacteriorhodopsin (BR) is an exciting photo-active retinal protein with many potential industrial applications. In this study, BR from the extremely halophilic archaeon Haloarcula marismortui (HmBR) was purified successfully using aqueous two phase extraction method. Absorption spectroscopy analysis showed maximum absorption peak of HmBR retinal protein (λmax ) at 415 nm. The purified HmBR was visualized by SDS-PAGE, with a subunit molecular mass of 27 kDa, and its identity was confirmed by resonance Raman spectroscopy, Fourier transform infrared spectroscopy and atomic force microscopy...
July 12, 2018: International Journal of Biological Macromolecules
Ruyan Li, Wenwen Tu, Huaisheng Wang, Zhihui Dai
Under near-infrared (NIR) light of 810 nm wavelength for irradiation, a very simple and highly sensitive photoelectrochemical (PEC) biosensing platform has been established using the localized surface plasmon resonance effect of Au nanoparticles (NPs) as signal amplification for the nondestructive analysis of living cells. The water-dispersible Ag2 S quantum dots (QDs) synthesized by a one pot method were employed as photoelectrochemically active species, and they exhibited excellent PEC properties irradiated with NIR light which was chosen due to the obvious absorption and fluorescent emission in the NIR light region...
July 24, 2018: Analytical Chemistry
Di Huang, Quanfeng He, Jie-Jie Shan, Matthew Sartin, Ran Pang, Fang-Zu Yang, Yongliang Zhou, Bin Ren, Zhong-Qun Tian, Dongping Zhan
Recently, the photoelectric effect in metals in electrolyte environments has aroused the interest of researchers. However, direct evidence for surface plasmons-enhanced electrochemical reactions involving classic outer-sphere reactions of reversible redox couples is seldom reported. We used a surface plasmons-active gold-mushroom-array as a working electrode and observed enhanced faradaic current from ferrocenemethanol following illumination with a xenon lamp. The photoelectric current behaved differently in the presence and absence of oxygen in the solution...
July 12, 2018: Faraday Discussions
Xuemin Li, Jinwu Bai, Bo Zhou, Xianfeng Yuan, Xiao Zhang, Lu Liu
Antimony sulfide (Sb2 S3 ) is an important chalcogenide belonging to Group V-VI that is suitable for application as a photoelectric material in the fields of photocatalysis, photoconductive detectors, ion conductor materials, and solar energy conversion materials. Herein, a facile, one-step hydrothermal method is used to synthesize a 3D, symmetric, flowerlike Sb2 S3 nanostructure. The structure was composed of numerous nanoneedles, which provided a large void fraction and specific surface area. Characteristic mesoporous structures of the samples contribute to excellent performance...
July 9, 2018: Chemistry: a European Journal
Lu You, Fan Zheng, Liang Fang, Yang Zhou, Liang Z Tan, Zeyu Zhang, Guohong Ma, Daniel Schmidt, Andrivo Rusydi, Le Wang, Lei Chang, Andrew M Rappe, Junling Wang
Ferroelectric materials for photovoltaics have sparked great interest because of their switchable photoelectric responses and above-bandgap photovoltages that violate conventional photovoltaic theory. However, their relatively low photocurrent and power conversion efficiency limit their potential application in solar cells. To improve performance, conventional strategies focus mainly on narrowing the bandgap to better match the solar spectrum, leaving the fundamental connection between polar order and photovoltaic effect largely overlooked...
July 2018: Science Advances
Shi Ye, Jia-Yi Sun, Yu-Hong Han, Ya-Yun Zhou, Qin-Yuan Zhang
CsPbX3 (X = Cl, Br, I) perovskite quantum dots (QDs) have emerged as competitive candidate luminescent materials in the photoelectric fields due to their superior luminescence properties. However, the major drawback such as poor resistance to temperature, moisture, and irradiation of light, especially for the red QDs with I- , hinders their practical applications. Herein, we synthesized Mn2+ -doped CsPbCl3 embedded in the cage of zeolite-Y as a new orange-red phosphor for the white light-emitting diode (WLED)...
July 25, 2018: ACS Applied Materials & Interfaces
Damian Czarnecki, Björn Poppe, Klemens Zink
In 2016 the ICRU published a new report dealing with key data for ionizing radiation dosimetry (ICRU Report 90). New recommendations have been made for the mean excitation energies I for air, graphite and liquid water as well as for the graphite density to use when evaluating the density effect. In addition, the ICRU Report 90 discusses renormalized photoelectric cross sections, but refuses to give a recommendation on the use of renormalization factors. However, the Consultative Committee for Ionizing Radiation recommends to use renormalized photoeffect cross sections...
August 1, 2018: Physics in Medicine and Biology
Yuanzuo Li, Chaofan Sun, Peng Song, Fengcai Ma, Nawee Kungwan, Mengtao Sun
Two series of novel dyes were designed based on the multipolar structures of the red dye D35 and blue dye DB, by introducing the furan (F), benzene ring (B) and benzo[c]thiophene (BT) groups into the conjugated bridge of D35 in proper order and adjusting the position of diketopyrrolopyrrole(DPP) unit and the incorporation of fluorine in the conjugated bridge of DB, respectively. We performed the quantum chemistry calculation to investigate the ground state and excited properties in a direct correlation with the spectra properties and abilities of losing or accepting electron for the original and designed molecules...
July 4, 2018: Scientific Reports
He Jiang, Gelei Jiang, Weiwei Xing, Weiming Xiong, Xiaoyue Zhang, Biao Wang, Huiyan Zhang, Yue Zheng
We propose a doped method by using [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) as dopant to stuff the pure iodine base perovskite (CH3NH3PbI3) surface grain boundary. PCBM is established on TiO2 as an additional layer to improve the interface contact. These methods demonstrate its superior in very low hysteresis effect (LHE) as well as high current density (HCD) in perovskite solar cell because of the improvement of interface contact at TiO2/perovskite and impressive compactness with pinhole-free and few grain boundaries perovskite surface...
July 3, 2018: ACS Applied Materials & Interfaces
J Y Dong, M Yao
Traumatic scar is a common complication of skin injury, such as burn, trauma, and surgery. The mechanism for scar formation still remains unclear. Traumatic scar has a negative impact on the quality of patients' life, due to the appearance of scar always causes physical or/and psychological problems to patients. The treatments for scar include surgery, chemotherapy, radiotherapy, and pressure, depending on the kind of scar present. Recently, a great progress in treating scar has been achieved by novel techniques with laser, intense pulsed light, micro-plasma radiofrequency, and ultrasound...
June 20, 2018: Zhonghua Shao Shang za Zhi, Zhonghua Shaoshang Zazhi, Chinese Journal of Burns
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