TALANTA
·
2018
·
IF 4.244
Qiao Liu,Xing-Li Xie,Chang-Jie Mao,Jing-Shuai Chen,He-Lin Niu,Ji-Ming Song
A highly selective DNA-based electrochemiluminescence (ECL) based biosensor is described for the detection of human IgG. It is exploiting the effect of steric hindrance that affects the strength of the ECL signal in the presence of IgG. Digoxin-linked signaling DNA was specifically bound to IgG, and this causes steric hindrance which limits the ability of DNA to hybridize with capturing DNA attached to a gold electrode. Europium (II) doped CdSe quantum dots were covalently linked to the DNA in order to generate the ECL signal. Using this steric hindrance hybridization method, the ECL signal of the biosensor were proportional to the concentration of IgG with a wide linear range and a 14 pM detection limit. Conceivably, the method can be expanded to the detection of a wide range of proteins for which homologous recognition elements are available.
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PubMed
高影响因子
POLYMER
·
2018
·
IF 3.483
Weining Du,Yong Jin,Shuangquan Lai,Liangjie Shi,Wuhou Fan,Jiezhou Pan
In this work, polyurethane/functionalized graphene oxide composites containing diselenide bonds were fabricated by covalently incorporating functionalized graphene oxide (FGO) into hydroxyl-terminated polyurethane prepolymers via in-situ polymerization. It was found that the isocyanate terminated molecules were covalently attached onto the graphene oxide surface, and the FGO could act as a multifunctional reinforcer in mechanical and photo-thermal properties of polyurethane composites. Significant enhancements of mechanical, thermal transport, and crystallization performances of composites were observed with the incorporation of 2 wt% of FGO. Due to the photo-thermal and crystallization-induced effects of FGO as well as the exchangeable characteristic of diselenide bonds, the PID-FGO2 composite exhibited both shape memory and repeatable self-healing functions upon exposure to near infrared (NIR) irradiation. In particular, the introduction of diselenide bonds could greatly improve the healing efficiency from ∼45% to ∼90%, and the healing efficiencies were maintained above 75% even after five healing cycles. Such favorable healing is acquired by the photo-thermal response, shape memory effect, and diselenide exchange reaction simultaneously, and the shape memory effect is of great importance for assisting the healing process. We expect that this work could provide a viable avenue for multifunctional composite materials.
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高影响因子
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Jia Liu,Xiaoning Ma,Yanping Tong,Meidong Lang
The diselenide-containing polycarbonate ((PTMCSe) 2 ) and diselenide-containing poly( ε -caprolactone) ((PCLSe) 2 ) were synthesized by the ring opening polymerization using a new compound of di-(1-hydroxypropyl) diselenide ((HOC 3 H 6 Se) 2 ) as initiator. The dynamic properties of these diselenide-containing polymers were revealed by a series of diselenide exchange reactions, which could be realized under visible irradiation at room temperature. As the result of the diselenide exchange between (PTMCSe) 2 and (PCLSe) 2 , a di-block polymer (PCLSeSePTMC) was formed in (PTMCSe) 2 /(PCLSe) 2 alloy. Taking advantage of the diselenide exchange, the compatibility and miscibility of (PTMCSe) 2 /(PCLSe) 2 alloy was significantly improved by the exchange product (PCLSeSePTMC) which acted as polymeric compatilizer. This novel concept may be applied in other polymer alloys containing dynamic covalent polymers.
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高影响因子
Solar RRL
·
2019
·Vol. 3
·期 10
·1900131
·
IF 0
Afei Zhang,Zhengji Zhou,Wenhui Zhou,Dongxing Kou,Yuena Meng,Yafang Qi,Shengjie Yuan,Sixin Wu
A back contact interface in a kesterite Cu 2 ZnSn(S,Se) 4 (CZTSSe) photovoltaic device plays an important role in fabricating high quality semiconducting photoactive layers and improving carrier extraction efficiency. However, uncontrolled decomposition reactions between the CZTSSe absorber layer and Mo electrode result in high series resistance and recombination at the back interface. The insertion of high work function MoO 3 as an interfacial layer is considered as a promising way to engineer the back contact. This highlights the importance of elucidating the chemistry and dynamics of MoO 3 at the Mo/kesterite interface in the CZTSSe annealing process. Herein, A detailed investigation of the elemental diffusion and chemistry of the back contact with the MoO 3 intermediate layer during selenization is carried out. The results demonstrate that the presence of the MoO 3 interfacial layer largely suppresses the chemical reaction between Mo and CZTSSe in the annealing process, inducing high quality CZTSSe absorbing films with fewer voids and reducing the thickness of MoSe 2 from 209 to 84 nm when the optimized thickness of MoO 3 is 10 nm. This finally leads to the increase in device efficiency from 9.02% to 10.92%, and the best performance where an efficiency of 11.37% is achieved.
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ACS Applied Nano Materials
·
2019
·
IF 0
Fan Gao,Lanlan Yang,Jianguo Tang,Zhonglin Du,Yao Wang,Zhongyi Hu,Dongni Han,Linjun Huang,Laurence A. Belfiore
Pesticide residues in farm products create human health hazards. Hence, sensors that detect their existence are advantageous to address this critical problem. In this research contribution, fin-like CdSeS nanoplatelets were synthesized from solution by adjusting the selenium-to-sulfur molar ratio. Structural and photophysical properties were characterized via XPS, XRD, UV absorption, and fluorescence emission. CdSeS nanoplatelets exhibit a regular fin-like structure when the molar ratio of selenium-to-sulfur is 1:1. Fluorescence emission from these nanoplatelets occurs at two distinct wavelengths, characteristic of quantum dots. CdSeS fin-like nanoplatelets generate red-shifted fluorescence to 530 nm, which is useful to detect the popular organophosphorus pesticide dimethoate effectively at concentrations that range from 10–5 to 10–7 mol/L. Upon increasing dimethoate concentrations in solution, fluorescence intensity of CdSeS nanoplatelets decreases. Hence, direct sensing of dimethoate is feasible. Another important significance of this work is the use of low-toxicity and recyclable cadmium acetate instead of cancer-causing and nonrecyclable cadmium oxide, which will be helpful to reduce environmental pollution.
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DALTON TRANSACTIONS
·
2019
·Vol. 48
·期 23
·8279-8287
·
IF 4.052
Bo Lin,Zhiping Lin,Shougang Chen,Meiyan Yu,Wen Li,Qiang Gao,Mengyao Dong,Qian Shao,Shide Wu,Tao Ding,Zhanhu Guo
An efficient hydrogen evolution reaction (HER) depends essentially on high-performing electrocatalysts. The aggregation of catalysts normally deteriorates their activity and stability. In this study, a two-step route was used to synthesize surface intercalated well-dispersed spherical MoS2xSe2(1−x) nanocatalysts. The resulting catalysts present a highly active and stable performance towards the HER with an overpotential of −143 mV at 10 mA cm−2, and a Tafel slope of 53.8 mV dec−1. The mechanism for the enhanced HER was analyzed and was attributed to three factors: (i) large numbers of defects and edge active sites arising from the coexistence of S and Se elements; (ii) enhanced electric conductivity arising from the phase transition from the semiconducting 2H-phase to metallic 1T-phase during the intercalation process; and (iii) enlarged contact areas between active sites and electrolyte caused by the increased surface roughness due to the surface intercalation. This work not only deepens our understanding of the improved HER performance of surface intercalated catalysts, but also provides novel strategies for preparing durable electrocatalysts through surface engineering.
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PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Juan Xia,Qi Wang,Miaomiao Chen,Wenwen Li,Jie Liu,Jitang Chen,Hai Wu,Suhua Fan
To avoid the evaporation and leakage of the liquid electrolyte and increase the long-term stability of the cell, a strategy was developed to construct bifacial dye-sensitized solar cells employing quasi-solid-state electrolyte (BQDSSCs). Two metal selenides with different morphologies, Co 0.85 Se, which has a foliate structure like the structure of graphene, and Ni 0.85 Se, which has uniform nanoparticle , were synthesized by a facile one-step hydrothermal method . The proposed BQDSSCs were then constructed using the TiO 2 photoanode, polyvinylidene fluoride gel electrolyte, and Co 0.85 Se or Ni 0.85 Se as the counter electrode (CE) electrocatalysts . Cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and Tafel polarization measurements were performed to investigate the electrochemical behavior of the Co 0.85 Se, Ni 0.85 Se, and Pt CEs. The results showed that the graphene-like Co 0.85 Se material exhibited better operational stability, greater charge-transfer ability, and higher electrocatalytic activity for the reduction of I 3 − than the Ni 0.85 Se nanoparticles. Furthermore, for the BQDSSCs, Co 0.85 Se yielded the highest power conversion efficiencies (PCE) of 8.33% and 4.79% under front and rear irradiations, respectively, in comparison with the front and rear efficiencies of 7.44% and 4.05% for Pt and 7.23% and 4.16% for Ni 0.85 Se CEs, respectively. The BQDSSC device based on the Co 0.85 Se CE exhibited good long-term stability with only a 5% drop in power conversion efficiency after 1000 h of one-sun soaking. Consequently, graphene-like Co 0.85 Se was considered to be an ideal material for constructing cost-effective BQDSSCs.
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高影响因子
Nanomaterials
·
2019
·Vol. 9
·期 4
·506
·
IF 4.034
Shuquan Chang,Xian Wu,Jianzhang Lan,Zheng Li,Xiaohong Zhang,Haiqian Zhang
Quantum dots (QDs) have attracted great attention due to their unique optical properties. High fluorescence efficiency is very important for their practical application. In this study, we report a simple and efficient strategy to enhance the photoluminescence of water-dispersed thiol-capped QDs using γ-radiation. Three kinds of QDs with different surface ligands and cores (MPA-CdTe, MPA-CdSe and Cys-CdTe) were fabricated and irradiated by high-energy γ-ray in an aqueous solution. Their photoluminescence intensities were significantly enhanced after irradiation, which were closely related to the radiation dose and the structure of QDs. The positions of the fluorescence emission peaks did not shift obviously after irradiation. The mechanism of photoluminescence enhancement was discussed based on the results of photoluminescence (PL) spectra, UV-visible light absorption (UV-vis) spectra, transmission electron microscope (TEM), X-ray diffraction (XRD) patterns, Fourier transform infrared (FT-IR) spectra and X-ray photoelectron spectroscopy (XPS). This method can be employed to uniformly treat large batches of QDs at room temperature and without other chemicals.Keywords:quantum dots;luminescence enhancement;γ-radiation;thiol-capped
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PubMed
高影响因子
Nano Energy
·
2019
·
IF 15.548
Bangsen Ouyang,Cheng Chang,Li-Dong Zhao,Zhong Lin Wang,Ya Yang
Self-powered photodetectors (PDs) have attracted great attentions due to energy shortage and the upcoming internet of things . However, the bottleneck of traditional methods to enhance the output performances of self-powered PDs are largely limited. Here, we report a dramatic coupling enhancement ("1 + 1>2") of the output signals in a bromine doped tin selenide (SnSe:Br) single crystal due to the thermo-photoelectric coupled effect for enhanced self-powered PDs. As compared with that of individually illuminating the device, both the output current and voltage signals of the PD can be enhanced by 38.1% and 81.9% under the simultaneous illumination at the top surface and cooling at the bottom surface, respectively. The coupling enhancement mechanism is associated with the same polarities of photoelectric and thermoelectric signals during the cooling process, where the photo-generated electrons can be accelerated by the driving force of the thermoelectric field under the cooling condition. This work offers a novel approach to enhance the output performances of self-powered PDs.
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高影响因子
Journal of Materials Chemistry C
·
2019
·Vol. 7
·期 35
·10777-10782
·
IF 6.641
Fuqiang Fan,Cheng Liu,Sha Wang,Jinqiu Lv,Wenze Li,Yu Fu,Huaping Xu
An ordered pattern or a distinct texture on surfaces endows materials with specific applications, such as oil–water separation, advanced anticounterfeiting and optical devices. Conventional photolithography and surface patterning methods can form only 2D patterns, and they are also limited by the shape of a material and the required equipment. In this study, a swelling-induced 3D photopatterning (SPP) method is demonstrated to manipulate both the shape and surface pattern of a material. Under the irradiation of visible light, metathesis of diselenide bonds induces different swelling behaviors between irradiated and nonirradiated regions. Based on the differences, various programmable 3D patterns are obtained. Notably, the SPP method is not limited by the size and shape of the material; therefore, this method can be applied to thin film materials, bulk materials and cylindrical materials. In addition, this strategy has potential applications in advanced anticounterfeiting.
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高影响因子
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2019
·
IF 2.752
Jingfeng Wang,Fei Jiao,Di Zhang,Meixia Chang,Lingbo Cai,Yunlong Li,Cao Wang,Shugang Tan,Qiang Jing,Bo Liu,Dong Qian
The relationship between the doping position of Nb in Bi 2 Se 3 and its superconductivity is investigated by XPS, magnetic measurement and transport measurement. It is found that for Nb x Bi 2 Se 3 , the main impurity phase comes from BiNbSe 3 . Superconducting volume fraction of Nb doped Bi 2 Se 3 increases with the ratio of Nb inserted in the van der Waals layers. The van der Waals-layer-position doped Nb may lead to superconductivity in Bi 2 Se 3 . This work may stimulate further investigation on topological superconductivity mechanism of Nb x Bi 2 Se 3 .
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Qiuyan Hao,Guoliang Cui,Yongguang Zhang,Jingde Li,Zisheng Zhang
Despite their high theoretical capacity (1672 mAh g −1 ) and energy density (2600 Wh kg −1 ), the commercialization of lithium/sulfur (Li/S) batteries is hindered by the polysulfide shuttle phenomenon and sluggish electrode kinetics. Herein, we demonstrate a novel MoSe 2 /MoO 2 heterostructure via water-steam etching as an effective sulfur host for high-performance Li/S batteries. The as-prepared flower-like MoSe 2 /MoO 2 heterostructure exhibited strong affinity toward polysulfide intermediates with a strong adsorption energy of −3.46 eV, rendered by MoO 2 , and enhanced the redox kinetics significantly. Consequently, S/MoSe 2 /MoO 2 electrode, with 66% sulfur content, delivered a high initial capacity of 1100 mAh g −1 and high capacity retention of 77.1% after 500 cycles at 0.5 C. The synthesis of MoSe 2 /MoO 2 heterostructure presents a promising strategy to design sulfur hosts for high-performance Li/S batteries.
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高影响因子
危险品化学品经营许可证（带存储）