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Shuming Liu, Liang Zhou, Juying Lei
A new approach is developed to fabricate inverse opal TiO2-x photonic crystal (IO-TiO2-x). The whole synthesis process is simple and feasible. What's more, the reduction degree of TiO2 is very convenient to control precisely and structural controllability can also be achieved in this new approach. In addition, the low reaction temperature and inert atmosphere make it safer than the traditional H2-reduction, Al-reduction or NaBH4-reduction method. A series of IO-TiO2-x samples with different reduction degree were prepared and characterized...
December 3, 2018: Chemistry, An Asian Journal
Daiming Liu, Qingkang Wang, Qing Wang
The wastage of near-infrared light seriously restricts the photoelectric conversion efficiency of hydrogenated amorphous silicon (a-Si:H) thin film solar cells. Spectral upconversion is of great significance in reducing the wastage. Herein, the upconverting compound NaYF4 :Yb3+ /Er3+ was synthesized via a hydrothermal method. SEM and XRD results revealed the morphology and a phase transition from cubic to hexagonal NaYF4 . Photoluminescence spectra indicated that the hexagonal NaYF4 :Yb3+ /Er3+ nanorods convert near-infrared light of 980 nm to the visible light with wavelength peaks at 654, 541 and 522 nm...
2018: Beilstein Journal of Nanotechnology
Kristi M Ishihara, Fangyuan Tian
Understanding the photocurrent transportation within porphyrin-containing metal-organic frameworks (PMOFs) will be a critical step for applying these materials in light-harvesting molecular devices in the future. Two copper porphyrin paddle-wheel frameworks (Cu-PPFs) were employed to study the influence of metal ions coordinated into the porphyrin ligands on conductivity and photoelectron transfer capability. To compare the electronic and optical properties of both materials, we prepared an ultra-thin film of each PPF via a Langmuir-Blodgett method...
November 28, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Shuiyuan Wang, Chunsheng Chen, Zhihao Yu, Yongli He, Xiaoyao Chen, Qing Wan, Yi Shi, David Wei Zhang, Hao Zhou, Xinran Wang, Peng Zhou
Just as biological synapses provide basic functions for the nervous system, artificial synaptic devices serve as the fundamental building blocks of neuromorphic networks; thus, developing novel artificial synapses is essential for neuromorphic computing. By exploiting the band alignment between 2D inorganic and organic semiconductors, the first multi-functional synaptic transistor based on a molybdenum disulfide (MoS2 )/perylene-3,4,9,10-tetracarboxylic dianhydride (PTCDA) hybrid heterojunction, with remarkable short-term plasticity (STP) and long-term plasticity (LTP), is reported...
November 28, 2018: Advanced Materials
Daoyou Guo, Yuanli Su, Haoze Shi, Peigang Li, Nie Zhao, Junhao Ye, Shunli Wang, Aiping Liu, Zhengwei Chen, Chaorong Li, Weihua Tang
Ultraviolet (UV) radiation has a variety of impacts including the health of humans, the production of crops and the lifetime of buildings. Based on the photovoltaic effect, self-powered UV photodetectors can measure and monitor UV radiation without any power consumption. However, the current low photoelectric performance of these detectors has hindered their practical use. In our study, a super-high performance self-powered UV photodetector based on GaN/Sn:Ga2O3 pn junction was generated by depositing a Sn doped n-type Ga2O3 thin film onto a p-type GaN thick film...
November 28, 2018: ACS Nano
Wen-Yin Ko, Tzu-Jung Tien, Chuen-Yuan Hsu, Kuan-Jiuh Lin
A label- and amplification-free photoelectric immunosensor based on well-defined layer-by-layer sandwich-structured AuNP/TNW/AuNP composite is proposed for direct and ultrasensitive detection of α-fetoprotein (AFP). The AuNP/TNW/AuNP composite is produced by assembling an Au nanoparticle underlayer and anatase TiO2 nanowires (TNW) onto the FTO substrate, followed by decorating Au nanoparticles onto the TNW surface, through a simple sputtering and hydrothermal process. The resulting AuNP/TNW/AuNP electrode exhibits a 14-fold and 2-fold enhancement in photocurrent density under simulated sunlight compared with that of bare TNW and AuNP/TNW, respectively, which benefits from the SPR-induced photoabsorption increment and charge separation improvement in Au nanoparticle and interfacial charge transfer promotion at the TiO2 /substrate interface in the Au underlayer...
November 19, 2018: Biosensors & Bioelectronics
B I Shapiro, A D Nekrasov, V S Krivobok, V S Lebedev
We report results of experimental studies of the photoabsorption, photoluminescent and photoelectric properties of a new type of multilayer molecular nanocrystals, consisting of highly ordered J-aggregates of one anionic and two cationic J-aggregates of cyanine dyes. In contrast to conventional J-aggregated dyes the multichromic nanocrystals synthesized in this work, are capable of efficient light absorption in three excitonic bands of the visible and near-IR spectral ranges. The spectral peak positions in the absorption bands can be controlled by appropriately selecting a set of dyes a molecular crystal is made of...
November 12, 2018: Optics Express
Han Dai, Pengfei Fu, Zhutie Li, Junfeng Zhao, Xinxiang Yu, Jie Sun, Hongjie Fang
An electricity-mediated plasmonic engineering was applied on a single Ag nanowire to engineer its tip for surface-enhanced Raman scattering (SERS). Under this constant photoelectric field treatment, a significant sharpening of the tip and reduction of the surface fluctuation was observed for the Ag nanowire tip via in situ atomic force microscopy. A significant SERS signal enhancement was thus obtained after the tip engineering. The relevant dynamic mechanisms of the tip engineering, including the light-induced plasmonic phase transition and electrostatic force driven flow on the Ag nanowire tip are discussed in detail...
September 17, 2018: Optics Express
Yannan Jiang, Wenbing Chen, Jiao Wang
In this paper, a broadband absorber utilizing monolayer molybdenum disulfide (MoS2 ) is proposed, and a generalized interference theory (GIT) is derived to investigate this absorber. Using the hybrid Lorentz-Drude and Gaussian model of monolayer MoS2 and the dyadic Green's functions, the propagation properties of monolayer MoS2 are first investigated. Then, a sandwich-like MoS2 -based absorber design is proposed in the visible regime. The sandwich-like structure is mounted on a fully reflective gold mirror, which forms a Fabry-Perot resonator to strengthen light-matter interactions and enhance the absorption...
September 17, 2018: Optics Express
Seong Gwan Shin, Hyung Wook Choi
A uniform compact layer is essential for obtaining high-efficiency perovskite solar cells (PSCs). This is because direct contact between the FTO glass substrate and the perovskite layer should be blocked to suppress electron recombination and to collect electrons. In the present study, PSCs were fabricated using sputtered TiO₂ compact layers prepared at different deposition times. The structure, morphology, and electrical properties of the sputter deposited TiO₂ compact layer were compared to those of a spin coated TiO₂ film...
March 1, 2019: Journal of Nanoscience and Nanotechnology
Zhongchen Bai, Man Peng, Zhengping Zhang, Shuijie Qin
The enhanced and broadened fluorescence of ZnSe quantum dots (QDs) were studied by using a fluorescence energy transfer system (FETS) of ZnSe QDs and gold nanoparticles (NPs). The FETS were prepared via uniformly dispersing the gold nanoparticles into ZnSe QD solution in the condition of magnetic stirring. Enhanced and broadened fluorescence was observed on the film of the FETS due to the transfer of photo-generated carriers between the ZnSe QDs and the gold NPs, instead of the surface plasma resonance effect...
October 1, 2018: Applied Optics
Li Xu, Ji-Xing Gao, Xiao-Gang Chen, Xiu-Ni Hua, Wei-Qiang Liao
Bistable optical-electrical duplex switches represent a class of highly desirable intelligent materials because of their potential applications in the fields of next-generation flexible devices. However, controllable photoelectric switchable materials with high-performance dielectric-switching and optical-switching properties are still scarce, with triplex bistable switches being rarely reported. Herein, a novel optoelectronic triple-functional organic-inorganic material, 5-azonia-spiro[4,4]nonane tetrabromomanganese (1, [ASN]2[MnBr4], ASN = (CH2)4N(CH2)4), which undergoes a reversible solid-state phase transition around 327 K and exhibits a recognizable second harmonic generation (SHG) effect between SHG-on and SHG-off states, has been successfully synthesized and grown as block crystals...
November 21, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Mingfa Peng, Xinkai Xie, Hechuang Zheng, Yongjie Wang, Qi-Qi Zhuo, Guotao Yuan, Wanli Ma, Mingwang Shao, Zhen Wen, Xuhui Sun
Two-dimensional (2D) non-layered nanomaterials have attracted extensive attention for electronic and optoelectronic applications recently due to their distinct properties. In this work, we firstly employed a facile one-step method to synthesize 2D non-layered cadmium sulfide selenide (CdSx Se1-x , x=0.33) nanosheets with highly crystalline structure and then we introduced a generic spin-coating approach to fabricate PbS quantum dots (QDs)/2D CdSx Se1-x nanosheets hybrid nanostructure and demonstrate their potential for high-performance broadband photodetectors...
November 20, 2018: ACS Applied Materials & Interfaces
Kefeng Pan, Ying Li, Jiawei Zhang, Qing Zhao
As one of the critical raw materials, very pure gallium is important for the semiconductor and photoelectric industry. Unfortunately, refining gallium to obtain a purity that exceeds 99.99999% is very difficult. In this paper, a new, facile and efficient continuous partial recrystallization method to prepare gallium of high purity is investigated. Impurity concentrations, segregation coefficients, and the purification effect were measured. The results indicated that the contaminating elements accumulated in the liquid phase along the crystal direction...
November 17, 2018: Materials
Li Chen, Wei-Lin Chen, Xin-Long Wang, Yang-Guang Li, Zhong-Min Su, En-Bo Wang
Dye-sensitized solar cells (DSSCs) are the third generation of photovoltaic cells developed by Grätzel and O'Regan. They have the characteristics of low cost, simple manufacturing process, tunable optical properties, and higher photoelectric conversion efficiency (PCE). With an ever increasing energy crisis, there is an urgent need to develop highly efficient, environmentally benign, and energy-saving cell materials. Polyoxometalates (POMs), a kind of molecular inorganic quasi-semiconductor, are promising candidates for use in different parts of DSSCs due to their excellent photosensitivity, redox, and catalytic properties, as well as their relative stability...
November 19, 2018: Chemical Society Reviews
Wei Zhai, Jing Lin, Chun Li, Shouming Hu, Yang Huang, Chao Yu, Zhikai Wen, Zhenya Liu, Yi Fang, Chengchun Tang
One-dimensional (1D) inorganic perovskite nanowires (NWs) have attracted promising attention for application in the fields of photodetection, lasers and lighting due to their outstanding optoelectronic properties. However the direct synthesis of highly pure all-inorganic perovskite NWs with well-defined morphologies and compositions still remains challenging. Here we report the controllable synthesis of brightly emitting cesium lead halide CsPbX3 (X = Cl, Br) NWs and their assembly into high-performance photodetector nanodevices...
December 7, 2018: Nanoscale
Hui Xie, Xing Yang, Dexi Du, Yuzhen Zhao, Yuehui Wang
We synthesized silver nanowires (AgNWs) with a mean diameter of about 120 nm and 20⁻70 μm in length using a polyol process. The flexible transparent conductive AgNWs films were prepared using the vacuum filtration-transferring process, in which random AgNWs networks were transferred to a polyethylene terephthalate (PET) substrate after being deposited on mixed cellulose esters (MCEs). Furthermore, the photoelectric and mechanical properties of the AgNWs films were studied. The scanning electron microscopy images show that the AgNWs randomly, uniformly distribute on the surface of the PET substrate, which indicates that the AgNWs structure was preserved well after the transfer process...
June 13, 2018: Micromachines
Sang-Soo Chee, Dongpyo Seo, Hanggyu Kim, Hanbyeol Jang, Seungmin Lee, Seung Pil Moon, Kyu Hyoung Lee, Sung Wng Kim, Hyunyong Choi, Moon-Ho Ham
2D transition metal dichalcogenides (TMDCs) have emerged as promising candidates for post-silicon nanoelectronics owing to their unique and outstanding semiconducting properties. However, contact engineering for these materials to create high-performance devices while adapting for large-area fabrication is still in its nascent stages. In this study, graphene/Ag contacts are introduced into MoS2 devices, for which a graphene film synthesized by chemical vapor deposition (CVD) is inserted between a CVD-grown MoS2 film and a Ag electrode as an interfacial layer...
November 9, 2018: Advanced Materials
Jae Kun Jeon, Jong Ki Kim
The emission of fluorescent X-rays and low-energy electrons by mid-/high-Z nanoparticles upon irradiation with either X-ray photons or high-energy ion beams is referred to as the nanoradiator effect (NRE). A track analysis of NRE was performed using reactive oxygen species (ROS) gels, to which macrophages containing gold nanoparticles (AuNPs) were attached, together with single-cell irradiation of the intracellular nanoparticles from a microbeam of synchrotron X-rays, and the range and distribution of ^\bulletOH and O2 ^{ \bullet - } produced were compared with those of the Fe-nanoradiator by magnetite nanoparticles (FeONP, Fe3 O4 )...
November 1, 2018: Journal of Synchrotron Radiation
Chuanmin Ding, Kaijing Song, Hongyun Meng, Bing Zhang, Zhihuan Zhao, Honghong Chang, Wenlong Wei
The authors describe an amplified photoelectrochemical immunoassay for the tumor marker carbohydrate antigen 724 (CA724). The method employs a C3 N4 -MoS2 semiconductor as the photoelectric conversion layer. The nanocomposite was characterized by transmission electron microscopy, Fourier transform infrared spectroscopy, X-ray powder diffraction, and UV-vis diffuse reflectometry. The dye eosin Y was encapsulated into CaCO3 nanospheres which then were used as labels for antibody against CA724. In addition, Fe3 O4 nanospheres were employed as magnetic platform for constructing photoelectrochemical sandwich immunoassay...
November 6, 2018: Mikrochimica Acta
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