NANO
·
2020
·
IF 1.566
Jieqiong Wang,Jie Yang,Jian Fang,Yuhang Li,Hongyuan Zhang,Zhenbo Zhao,Yuhui Ao
The WSe 2 /g-C 3 N 4 (graphite carbon nitride) composite with photocatalytic properties was synthesized using a hydrothermal method. This synthesis pathway can be characterized by being simple, inexpensive and nonpolluting, integrating the concept of green chemistry. The WSe 2 /g-C 3 N 4 composite could effectively degrade methyl orange solution under visible light irradiation. The decolorization experiment of methyl orange solution shows that the degradation rate of the 30 wt.% WSe 2 /g-C 3 N 4 composite can reach 98.7% after 100 min of illumination, while the degradation rate of pure g-C 3 N 4 was only 87.6% under the same conditions. This can be attributed to the fact that the combination of WSe 2 and g-C 3 N 4 nanosheets can increase the number of active binding sites, increasing the rate of charge separation and transport ability, decreasing the recombination rate of the photogenerated electron–hole pairs. Therefore, the WSe 2 /g-C 3 N 4 composite will have potential development as a new material with low cost, easy synthesis and excellent performance in photocatalytic degradation of water pollution.
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高影响因子
Advanced Electronic Materials
·
2020
·Vol. 6
·期 5
·2000035
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IF 6.593
Ruiqi Guo,Linxing Zhang,Jie Meng,Aqiang Liu,Jifeng Yuan,Kaibo Zheng,Jianjun Tian
Compared to analogous bulk materials, colloidal nanocrystals have presented a powerful platform for building up electronic devices on the nano/micrometer scale and flexible portable electronic apparatus with the benefits of solution-based processing approach at room temperature. Herein, memristors based on CuInSe 2 (CISe) colloidal nanocrystals prepared using a solution-based process at room temperature are constructed. The memristors exhibit obvious bipolar resistive switching performance with a high–low resistance ratio larger than 5.7 and a steady retention time over 10 4 s. This is attributed to the copper ion redox reaction and the migration of these ions under an applied electric field. When the SET voltage is reached, the ions are separated from one of the electrodes, and the memristor changes from a low-resistance state (LRS) to a high-resistance state (HRS). Conversely, when the voltage reaches the RESET voltage, the memristor switches from a HRS to a LRS. In addition, the flexible memristor can be fabricated by spincoating nanocrystal solution onto polyethylene terephthalate (PET) at room temperature, showing excellent reproducibility of the performance including 100 times of continuous operation, 10 4 s of reproducible reading, 600 times of antifatigue testing, and thermal stability up to 95 °C. The flexible devices demonstrate promising applications for portable electronic devices.
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高影响因子
Journal of Materials Chemistry A
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2020
·Vol. 8
·期 11
·5699-5708
·
IF 11.301
Xin Qian,Dongyang Wang,Yang Zhang,Haijun Wu,Stephen J. Pennycook,Lei Zheng,Pierre F. P. Poudeu,Li-Dong Zhao
The metallic elements with a small atomic radius can not only compensate for the intrinsic vacancies to improve the carrier mobility, but also can form interstitials to reduce lattice thermal conductivity. In this work, we investigate the contrasting roles of three different metallic elements with small atomic radius on the thermoelectric properties of n-type PbM0.01Se (M = Cu, Zn, Ni). We find that all the metallic elements can increase the carrier concentration as electron donors and improve the electrical transport properties. In addition, the lattice thermal conductivity of PbSe can be significantly decreased through the formation of interstitials by the incorporated extra metallic elements. We also find that the PbCu0.01Se sample exhibits a unique and complex behavior compared with the other samples due to the diffusion and the thermally activated oxidation of Cu+ ions. When the temperature increased to 673 K, the carrier concentration of PbCu0.01Se sample increases suddenly and continues to increase by nearly two folds, which we ascribe to the release of 3d orbital electrons in Cu+ ions. This results in a strong decoupling of the charge and heat transport in the material, which can be manifested by the overestimation of the electronic thermal conductivity when assuming strong electron–phonon coupling in Wiedemann–Franz law. A maximum ZT of ∼1.6 can be reached at 773 K and the average ZT of ∼0.96 can be achieved in PbCu0.01Se. Our results demonstrate the exceptional contrasting behavior of Cu in PbSe by comparing with Zn and Ni, and the thermoelectric performance of n-type PbSe can be enhanced through the introduction of extra metallic elements with small radius.
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高影响因子
ACS Sustainable Chemistry & Engineering
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2020
·
IF 7.632
Wei Li,Yanli Niu,Xiuju Wu,Fawang Wu,Tianhao Li,Weihua Hu
Metal selenides attract great research interest as oxygen evolution reaction (OER) electrocatalysts. Herein, we report heterostructured bimetallic cobalt–iron diselenide nanoparticles with abundant vacancies and strong electronic coupling supported on carbon nanorod (CoSe2/FeSe2@C) as a highly efficient OER electrocatalyst. It is synthesized with a facile templating-engaged synthetic strategy and exhibits outstanding OER catalytic performance including high activity and good durability in alkaline medium. It affords a current density of 10 mA cm–2 at a low overpotential of 291 mV with small Tafel slope of 62 mV dec–1, which significantly outperforms the benchmarking RuO2 catalyst. The outstanding OER performance is found to be arising from its integrated advantages of the modulated electronic structure, abundant active sites, high electric conductivity, and large surface area endowed by its unique heterostructure and composition. This work exemplifies a feasible route to designing heterogeneous nanomaterials and enriches the OER electrocatalytic application of transition metal selenide-based hybrid materials.
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高影响因子
Journal of Materials Chemistry C
·
2020
·Vol. 8
·期 19
·6358-6363
·
IF 7.059
Rui Cheng,Kangzhe Ma,Hong-Gang Ye,Luting Ling,Guan Wu,Cai-Feng Wang,Su Chen
Quantum dots (QDs) have gained extensive attention owing to their outstanding photoelectric properties. However, the fast and continuous synthesis of QDs remains a challenge. Herein, for the first time, we develop a magnetothermal microfluidic technique (MMT) to rapidly synthesize CdSe and CdSe@ZnS QDs with higher optical performance and continuous production. The as-prepared CdSe@ZnS QDs exhibit relatively high photoluminescence quantum yields (PL QYs) (∼70%). Meanwhile, by manipulating the fluid rate and reaction temperature of the MMT, the emission wavelengths can be tuned in the visible region from 515 to 625 nm. Furthermore, the red emissive CdSe@ZnS QDs are used as fluorescent conversion materials in a backlight display, which shows a wide color gamut around 112%. Our purpose is to highlight a new powerful platform of the MMT for rapid, accurate, and continuous fabrication of photoluminescent nanomaterials, which will guide the substantial progress of backlight displays and light emitting diodes (LEDs).
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高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Xiaogong Lv,Chengjun Zhu,Huimin Hao,Ruijian Liu,Yiming Wang,Junzhen Wang
In this work, Cu 2 ZnSn 1- x Ge x S 4 (CZTGS) precursor thin films with varied Ge composition ( x = 0, 0.2, 0.4, 0.6, 0.8, and 1) were prepared by using a water-based solution approach. After selenizing at 550 °C for 10 min in a graphite box containing selenium powder, the as-fabricated kesterite Cu 2 ZnSn 1- x Ge x (S,Se) 4 (CZTGSSe) thin films were systematically investigated for phase structure, morphology, valence states of elements, optical properties , and electrical properties. The results showed that the Ge element was successfully incorporated into the host lattice of Cu 2 ZnSn(S,Se) 4 (CZTSSe), and kesterite CZTGSSe films were formed. As the Ge content increased, the crystal grains in the films grew larger and showed uniform morphology on the sample surfaces. The band gap in the CZTGS(Se) thin films could be engineered in the range of 1.21 eV–2.00 eV by tuning the relative compositions of the Ge elements. Furthermore, it was confirmed that the doping of Ge improved the mobility, resistivity, and photoelectric performance of the films. Finally, the Cu 2 ZnSn 0.8 Ge 0.2 (S,Se) 4 solar cell device with an efficiency of 5.39% was prepared. The results indicate that non-toxic water solution-based CZTGSSe films showed potential for application in solar cells.
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高影响因子
JOURNAL OF LUMINESCENCE
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2020
·
IF 3.28
Yue Lu,Yong Yang,Li Guan,Dawei Wang,Jinxin Zhao,Jingfa Yang,Zhiren Wei,Fenghe Wang,Zhiping Yang,Xu Li
ZnS coating with oleic acid nano-particles have been successfully synthesized through the oil-phase thermal injection method. As-prepared samples are characterized by powder X-ray diffraction, transmission electron microscopy and spectra analysis. The emission color of ZnS NPs changes from blue to cyan with different ratio of Zn/S. ZnS: x Eu 3+ NPs with different doping concentrations of Eu 3+ ions have different emission intensities and CIE coordination. The emission peaks vary with the change of y value of ZnSe y S 1- y NPs, and the chromaticity coordinate transit from green to yellow region. The emission color and mechanism of the luminescent properties of ZnS, ZnS: x Eu 3+ and ZnSe y S 1- y NPs are studied in detail. The results indicate that the thermal mixture injection without toxic is an effective and green method for synthesizing metal sulphitde, and the energy level structure, particle size, photoluminescence of ZnS can be achieved by forming different defect or doping of Eu or Se ions .
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高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Dongxu Zhu,Lijin Wang,Zheming Liu,Aiwei Tang
Cubic Cu 2−x Se nanocrystals (NCs) exhibit a strong localized surface plasmon resonance (LSPR) absorption in the near-infrared (NIR) region, in which the LSPR wavelength and stability are significant for the NIR-region applications in photo-thermal therapy and photoacoustic imaging. Herein, we have systematically studied the effects of surface ligands with varying the feeding ratio of oleylamine (OM) to oleic acid (OA) on LSPR behavior and stabilization of Cu 2−x Se NCs, which were synthesized by using a typical hot-injection method. The LSPR wavelength of the as-obtained Cu 2−x Se NCs could be tuned from 1260 to 1030 nm with an increase of the feeding ratio of OM to OA. Furthermore, these Cu 2−x Se NCs showed different LSPR stability with varying feeding ratios of OM to OA. For the Cu 2−x Se NCs synthesized in the presence of only OM, the LSPR could keep stable basically after exposure to air for 60 days. However, in the feeding ratio of OM to OA of 7:3 and 5:5 cases, the LSPR extinction spectra showed an obvious blue-shift in the wavelength. The characterized results indicated the different surface ligands had significant effects on the LSPR behavior and stabilization, and the LSPR change was in good agreement with the calculated results based on the Mie-Drude model. This work provides a new research idea for tuning the LSPR behavior of copper chalcogenide NCs.
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高影响因子
ACS Applied Bio Materials
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2020
·
IF 0
Tianyu Li,Shuojiong Pan,Hao Zhuang,Shiqian Gao,Huaping Xu
Developing multifunctional carrier-free nanomedicine with high efficacy attracts tremendous attention in cancer treatment. Here, we develop selenium-containing carrier-free assemblies with aggregation-induced emission (AIE) property, which achieve the combination of cancer radiotherapy with chemotherapy. Under γ-radiation, diselenide bonds in the assemblies can be cleaved to form seleninic acid, which exhibits anticancer activity by upregulating the reactive oxygen species (ROS) levels in cancer cells. The incorporation of AIE groups further endows the selenium-containing assemblies with the ability of bioimaging. Their self-assembly behavior change under γ-radiation can be consequently observed in situ. The system combines cancer radiotherapy with chemotherapy, which exhibits improved anticancer activity.
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PubMed
MACROMOLECULAR BIOSCIENCE
·
2021
·Vol. 21
·期 12
·2100229
·
IF 4.979
Fangqin Song,Siqi Li,Chuanhao Sun,Ying Ji,Yan Zhang
The integration of hypoxia-activated chemotherapy with photodynamic therapy (PDT) has newly become a potent strategy for tumor treatment. Herein, a reactive oxygen species (ROS)-responsive drug carriers (PS@AQ4N/mPEG- b -PSe NPs) are fabricated based on the amphiphilic selenium-containing methoxy poly(ethylene glycol)-polycarbonate (mPEG- b -PSe), the hydrophobic photosensitizer (PS), and hypoxia-activated prodrug Banoxantrone (AQ4N). The obtained nanoparticles are spherical with an average diameter of 100 nm as characterized by transmission electron microscope (TEM) and dynamic laser scattering (DLS) respectively. The encapsulation efficiency of the PS and AQ4N reaches 92.83% and 51.04% at different conditions, respectively, by UV–vis spectrophotometer. It is found that the drug release is accelerated due to the good ROS responsiveness of mPEG- b -PSe and the cumulative release of AQ4N is up to 89% within 30 h. The cell test demonstrates that the nanoparticles dissociate when triggered by the ROS stimuli in the cancer cells, thus the PS is exposed to more oxygen and the ROS generation efficiency is enhanced accordingly. The consumption of oxygen during PDT leads to the increased tumor hypoxia, and subsequently activates AQ4N into cytotoxic counterpart to inhibit tumor growth. Therefore, the synergistic therapeutic efficacy demonstrates this drug delivery has great potential for antitumor therapy.
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PubMed
高影响因子
Journal of Materials Chemistry C
·
2021
·Vol. 9
·期 30
·9599-9609
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IF 7.393
Cong Shen,Yanqing Zhu,Zixiao Li,Jingling Li,Hong Tao,Jianhua Zou,Xueqing Xu,Gang Xu
InP quantum dots (QDs) are considered as the most promising alternative to Cd-based QDs with lower toxicity, and emission spectrum tunability ranging from the visible to near-infrared region. Although high-quality fluorescent InP QDs have been successfully synthesized by several groups, the rigorous synthesis conditions hinder its practical use in display devices. In this work, for the first time, we introduce Zn2+ into the growth stage of the InP QDs to prepare an InP–In(Zn)P core, and then the as-grown InP–In(Zn)P cores were consecutively coated with typical double shells of inner ZnSe and outer ZnS. The final InP–In(Zn)P/ZnSe/ZnS core/shell/shell QDs exhibited a maximum photoluminescence (PL) quantum yield (QY) of 94.3% and have tunable emissions from yellow (569 nm) to red (630 nm), showing a potential application in display devices. Above all, compared with other related studies, the excellent PL properties were obtained in relatively milder conditions (ultimate vacuum level of 400 mTorr). The results of this study provide guidance for the commercial application of InP QDs as a viable alternative to Cd-based QDs.
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高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2021
·
IF 3.498
Fang-Yu Yuan,Chen-Sheng Lin,Yi-Zhi Huang,Hao Zhang,An-Yi Zhou,Guo-Liang Chai,Wen-Dan Cheng
In this work, we chose to explore the infrared (IR) nonlinear optical (NLO) materials centering on Cd and Ge elements, and finally synthesized a new IR NLO quaternary selenide BaCdGeSe 4 . Compound BaCdGeSe 4 crystallizes in non-centrosymmetric (NCS) space group Fdd 2 (No. 43), and it is built by parallel two-dimensional (2D) anionic [CdGeSe 4 ] 2- layers with the cation Ba 2+ embedded between the layers. Under the 2050 nm laser excitation, compound BaCdGeSe 4 appears type-I phase-matchable behavior and its second-harmonic generation intensities is about 0.5 times of AgGaS 2 .
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高影响因子
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