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Chang Xia, Chunxiao Zhu, Xiaomei Zhao, Xu Chen, Tianqi Chen, Ting Wan, Zehua Xu, Gaofeng Wen, Yong Pei, Chaofan Zhong
To broaden the absorption spectrum, improve intramolecular electronic push-pull balance capability, enhance electron transfer and promote the photovoltaic performances of dye sensitizers, four new polymeric metal complex dyes (PBDTT-PhenCd, PBDTT-PhenCu, PPV-PhenCd and PPV-PhenCu) with donor-acceptor-π-bridge-acceptor (D-A-π-A) structure were designed and synthesized. These dyes, for the first time, used the complexes of Cd(ii) or Cu(ii) with phenanthroline as auxiliary electron acceptors (A) instead of organic electron withdrawing groups and adopted thienylbenzo [1,2-b:4,5-b'] dithiophene (BDTT) or hydroquinone (PV) derivatives as electron donors (D) and 8-quinolinol derivatives as π bridge and acceptors (A)...
February 19, 2018: Physical Chemistry Chemical Physics: PCCP
Yan Zhang, Yungen Wu, Zhe Sun, Yanan Kang, Tianyang Chen, Hui Wang, Mao Liang, Song Xue
Self-assembly of organic sensitizer layers in cobalt complex-based DSCs was studied to elucidate its role in reducing the loss of charge recombination. DSCs with various dye loadings were fabricated by dye desorption without the aid of basic solvent. The FT-IR and UV results indicate the deprotonation of the anchoring organic sensitizers, which influences the conduction band of TiO2 remarkably by changing the surface potential. Positive band edge shifts and a decrease of the recombination rate constant are demonstrated to be the main factors affecting energy loss at open circuit...
February 19, 2018: Physical Chemistry Chemical Physics: PCCP
Michael R Hamblin
Photodynamic therapy (PDT) involves the combination of non-toxic dyes called photosensitizers (PS) and harmless visible light that interact with ambient oxygen to give reactive oxygen species (ROS) that can damage biomolecules and kill cells. PDT has mostly been developed as a cancer therapy but can also be used as an antimicrobial approach against localized infections. However even the longest wavelength used for exciting PS (in the 700 nm region) has relatively poor tissue penetration, and many PS are much better excited by blue and green light...
February 16, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Jing Ma, Jing Zhao, Weihua Ren, Bin Tang
In this study, Titanium dioxide (TiO2) microspheres were synthesized by a hydrothermal method from the same precursor: titanium sulfate. Two different TiO2 microspheres with different surface and crystallinity were fabricated by adding different additives as the photoanode of dye-sensitized solar cells (DSSCs). The growth mechanisms of the TiO2 microspheres were discussed. The effect of surface status and the crystallinity of the TiO2 microspheres on the photovoltaic characteristic of DSSCs were investigated...
March 1, 2018: Journal of Nanoscience and Nanotechnology
Madsakorn Towannang, Anongnad Thiangkaew, Wasan Maiaugree, Kunthaya Ratchaphonsaenwong, Wirat Jarernboon, Samuk Pimanpang, Vittaya Amornkitbamrung
Tungsten carbide (WC) particles (~1 μm) were dispersed in DI water and dropped onto conductive glass. The resulting WC films were used as dye-sensitized solar cell (DSSC) counter electrodes. The performance of the WC DSSC based on the organic thiolate/disulfide (T-/T2) electrolyte was ~0.78%. The cell efficiency was greatly improved after decorating palladium (Pd) or platinum (Pt) nanoparticles on WC particles with a promising efficiency of ~2.15% for Pd-WC DSSC and ~4.62% for Pt-WC DSSC. The efficiency improvement of the composited (Pd-WC and Pt-WC) cells is attributed to co-functioning catalysts, the large electrode interfacial area and a low charge-transfer resistance at the electrolyte/counter electrode interface...
February 1, 2018: Journal of Nanoscience and Nanotechnology
Liguo Wei, Shishan Chen, Yulin Yang, Yongli Dong, Weina Song, Ruiqin Fan
Graphene has attracted a lot of attention because of its unique mechanical, thermal, electrical and optical properties. In this study, a double layered structured photoanode consisting of a graphene/TiO2 composite layer and a TiO2 nanoparticles (P25) underlayer was developed. The photoelectric properties of as-prepared double layer structured photoanode were studied with comparison of the anatase TiO2 photoanode. Graphene was prepared by reduction of graphene oxide (GO) under a hydrothermal conditions and graphenen/TiO2 composite semiconductor materials were prepared by mixing graphene into TiO2 paste...
February 1, 2018: Journal of Nanoscience and Nanotechnology
Woranan Lekphet, Shih-Yu Ho, Chaochin Su, Pedaballi Sireesha, Sasipriya Kathirvel, Ya-Fen Lin, Wen-Ren Li
TiO2 nanocubes were synthesized via hydrolysis condensation of titanium tetra-isopropoxide (TTIP) in aqueous media, followed by hydrothermal treatment with ammonium salts. Various ammonium salts with different alkyl chain such as ammonium hydroxide (NH4OH), tetramethylammonium hydroxide (TMAH), tetraethylammonium hydroxide (TEAH) and tetrabutylammonium hydroxide (TBAH) were investigated. The crystalline phase, shape, and morphology of TiO2 nanocubes were studied by XRD, TEM, and SEM analysis. These TiO2 nanocubes were pure anatase phase and tended to assemble with well-ordered and close-packed domains...
February 1, 2018: Journal of Nanoscience and Nanotechnology
Liliana A A N A Truta, Felismina T C Moreira, M Goreti F Sales
Monitoring cancer biomarkers in biological fluids has become a key tool for disease diagnosis, which should be of easy access anywhere in the world. The possibility of reducing basic requirements in the field of electrochemical biosensing may open doors in this direction. This work proposes for this purpose an innovative electrochemical immunosensing system using a photovoltaic cell as an electrical reading box. Immunosensing ensures accuracy, the electrochemical-ground of the device ensures sensitivity and detectability, and the photovoltaic cell drives the system towards electrical autonomy...
February 7, 2018: Biosensors & Bioelectronics
Tao Liu, Xianmin Mai, Haijun Chen, Jing Ren, Zheting Liu, Yingxiang Li, Lina Gao, Ning Wang, Jiaoxia Zhang, Hongcai He, Zhanhu Guo
The carbon nanotube aerogel (CNA) with an ultra-low density, three-dimensional network nanostructure, superior electronic conductivity and large surface area is being widely employed as a catalytic electrode and catalytic support. Impressively, dye-sensitized solar cells (DSSCs) assembled with a CNA counter electrode (CE) achieved a maximum power conversion efficiency (PCE) of 8.28%, which exceeded that of the conventional platinum (Pt)-based DSSC (7.20%) under the same conditions. Furthermore, highly dispersed CoS 2 nanoparticles endowed with excellent intrinsic catalytic activity were hydrothermally incorporated to form a CNA-supported CoS 2 (CNA-CoS 2 ) CE, which was due to the large number of catalytically active sites and sufficient connections between CoS 2 and the CNA...
February 15, 2018: Nanoscale
Jiajia Xiao, Po Li, Xiaogang Wen
Novel jujube-like hierarchical TiO2 microspheres (HTM) were synthesized by an alkali corrosion process of titanium phosphate (Ti2O3(H2PO4)2·2H2O) microspheres. The hierarchical titanium phosphate microspheres (HTPM) intermediates consisting of nanoflakes with a thickness of 20 nm were prepared firstly by a facile hydrothermal method. After reacting with diluted NaOH at low temperature and atmospheric pressure,following by subsequent acid washing and calcination process, the HTPM intermediates transformed to TiO2 with well remained microsphere morphology, while the nanoflakes became porous, and some new nanowires formed between the nanoflakes...
February 15, 2018: Nanotechnology
Ahmad Umar, Ahmed A Ibrahim
Herein, we report a facile synthesis, characterization and dye sensitized solar cell (DSSC) application of flower-shaped ZnO nanostructures. The flower-shaped ZnO nanostructures were synthesized by low-temperature hydrothermal process and characterized in detail by several techniques. The detailed morphological studies confirmed that the flower-shaped structures are formed by the accumulation of several nanoneedles which are axially arranged through their bases in a special fashion that they made flower-like morphologies...
May 1, 2018: Journal of Nanoscience and Nanotechnology
Jinzhao Huang, Nannan Yao, Xiaolong Deng, Ke Fu, Siyuan Chen
In this paper, graphene modified by Ag nanoparticles was successfully applied into dye sensitized solar cells. The morphologies and compositions of graphene and graphene-Ag nanoparticles were characterized by scanning electron microscope and energy dispersive X-ray spectroscopy. The optical and electrical properties were evaluated by UV-vis-NIR absorption spectroscopy, electrochemical impedance spectroscopy and current-voltage curve. The results indicated that the incorporation of graphene or graphene-Ag nanoparticles can improve the light absorption and decrease the charge recombination...
May 1, 2018: Journal of Nanoscience and Nanotechnology
Pan Yang, Zi-Jun Hu, Hong Lin, Xin-Chun Lai, Xiao-Chong Zhao, Li-Jun Yang
Low-cost carbon materials (carbon black and graphite power) were applied as substitution of platinum (Pt) in counter electrodes (CEs) for dye-sensitized solar cells (DSSCs). Three fabrication methods, such as ball-milled, pulp-refined, and ultrasonic-crushed, were applied to remove the particle aggregation in the carbon pastes. Then the carbon based pastes were printed on fluorine-doped transparent conducting oxide (FTO) glasses, used as the CEs for DSSCs. Under illumination of 100 mW/cm2, DSSCs with ultrasonic-crushed CEs (U-CEs) show an energy conversion efficiency of 3...
June 1, 2018: Journal of Nanoscience and Nanotechnology
Sara Freund, Antoine Hinaut, Nathalie Marinakis, Edwin C Constable, Ernst Meyer, Catherine E Housecroft, Thilo Glatzel
The properties of metal oxides, such as charge-transport mechanisms or optoelectronic characteristics, can be modified by functionalization with organic molecules. This kind of organic/inorganic surface is nowadays highly regarded, in particular, for the design of hybrid devices such as dye-sensitized solar cells. However, a key parameter for optimized interfaces is not only the choice of the compounds but also the properties of adsorption. Here, we investigated the deposition of an organic dye precursor molecule on a NiO(001) single crystal surface by means of non-contact atomic force microscopy at room temperature...
2018: Beilstein Journal of Nanotechnology
Samantha Husmann, Lucas Lima, Lucimara Roman, Aldo Jose Gorgatti Zarbin
Most of the dye-sensitized solar cells (DSSC) developed so far use organic electrolytes and water-sensible sensitizers. The search for aqueous DSSC, a promising technology for solar energy conversion, implies the finding of stable materials in aqueous solution. Herein we report the innovative utilization of Prussian blue (PB) as a sensitizer in a photoanode for DSSC. In this work, we describe a novel synthetic approach to a carbon nanotubes/TiO2/PB nanocomposite thin film. The photo-response is evaluated in a total aqueous electrolyte, achieving photocurrents of 600 μA cm-2...
February 13, 2018: ChemSusChem
Themmila Khamrang, Marappan Velusamy, Madhavan Jaccob, Mohan Ramesh, Murugavel Kathiresan, Arunkumar Kathiravan
The geometry (twist vs. planar) of a dye is one of the most pivotal factors for determining intramolecular charge transfer (ICT), light harvesting and photovoltaic properties of dye-sensitized solar cells. In order to comprehend the role of dye geometry on the above properties, we have devised the pyrene based D-π-A dyes namely 2-cyano-3-(5-pyren-1-yl-furan-2-yl)-acrylic acid (PFCC) and 2-cyano-3-(5-pyren-1-ylethynyl-furan-2-yl)-acrylic acid (PEFCC). The synthesized pyrene dyes were well characterized by NMR and EI-MS spectrometry...
February 12, 2018: Physical Chemistry Chemical Physics: PCCP
Sang Il Seok, Michael Grätzel, Nam-Gyu Park
A perovskite solar cell (PSC) employing an organic-inorganic lead halide perovskite light harvester, seeded in 2009 with power conversion efficiency (PCE) of 3.8% and grown in 2011 with PCE of 6.5% in dye-sensitized solar cell structure, has received great attention since the breakthrough reports ≈10% efficient solid-state PCSs demonstrating 500 h stability. Developments of device layout and high-quality perovskite film eventually lead to a PCE over 22%. As of October 31, 2017, the highest PCE of 22.7% is listed in an efficiency chart provided by NREL...
February 12, 2018: Small
Mohaddeseh Afshari, Mohammad Dinari, Mohamad Mohsen Momeni
In this research, polyaniline/graphitic carbon nitride (PANI/g-C3N4) nanocomposites were synthesized via in-situ electrochemical polymerization of aniline monomer whit different number of cyclic voltammetry scans (10, 20 and 30 cycles) after electrode surface pre-preparation using a potential shock under ultrasonic irradiation. PANI/g-C3N4 nanocomposites with two values of g-C3N4 (0.010 wt% and 0.015 wt%) were deposited on the surface of the transparent conducting film (FTO glass) by immersing FTO into the aniline solution and g-C3N4 during the electro-polymerization...
April 2018: Ultrasonics Sonochemistry
Aditya Ashok, S N Vijayaraghavan, Gautam Unni, Shantikumar Nair, Mariyappan Shanmugam
The present study elucidates dispersive electron transport mediated by surface states in tin oxide (SnO2) nanoparticles based dye sensitized solar cells (DSSCs). Transmission electron microscopic studies on the SnO2 showing a distribution of ~10 nm particles exhibiting (111) crystal planes with inter-planar spacing of 0.28 nm. The dispersive transport, experienced by photo-generated charge carriers in the bulk of SnO2, is observed to be imposed by trapping and de-trapping processes via SnO2 surface states present close to the band edge...
February 9, 2018: Nanotechnology
Feng Gao, Chuan-Lu Yang, Mei-Shan Wang, Xiao-Guang Ma, Wen-Wang Liu
The feasibility of nanocomposites of cir-coronene graphene quantum dot (GQD) with phthalocyanine, tetrabenzoporphyrin, tetrabenzotriazaporphyrins, cis-tetrabenzodiazaporphyrins, tetrabenzomonoazaporphyrins and their Cu-metallated macrocycles as a sensitizer of dye-sensitized solar cells (DSSC) are investigated. Based on the first principles density functional theory (DFT), the geometrical structures of the separate GQD and 10 macrocycles, and their hybridized nanocomposites are fully optimized. The energy stabilities of the obtained structures are confirmed by harmonic frequency analysis...
January 31, 2018: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
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