Micro & Nano Letters
·
2015
·Vol. 10
·期 5
·236-240
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IF 0.853
Yaping Zhong,Chun Deng,Yu He,Yili Ge,Gongwu Song
Hexamethylene-1,3-bis(cetyldimethylammonium bromide) (G 16-6-16 ) protected low-toxicity ZnSe quantum dots (QDs) were successfully synthesised and used as fluorescence probe to detect proteins such as bovine serum albumin (BSA). This method is simple, fast, selective and sensitive. Surfactant G 16-6-16 can interact with proteins through hydrophobic effect, thus leading to the fluorescence quenching of G 16-6-16 protected ZnSe QDs nanometre material. The fluorescence intensity of G 16-6-16 protected ZnSe QDs was linearly proportional to BSA over a concentration range from 0 to 80 nM with a correlation coefficient of 0.993. The detection limit was 0.04 nM. This method was successfully applied to determine BSA in urine samples which shows the good application value of this nanometre material.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2023
·
IF 6.2
Yun Xing,Shan Zhao,Jiaying Wu,Xin Tang,Yu Zhang,Zhirong Zou,Ke Huang,Xiaoli Xiong
Designing non-noble metal oxygen evolution catalysts with outstanding catalytic activity is crucial for realizing cost-effective water splitting. In this paper, nitrogen-doped carbon-encapsulated polyhedral yolk-shell nanostructure bimetallic selenide (ZnSe@CoSe 2 /N-C) electrocatalyst was successfully prepared by high-temperature selenization strategy using ZIF-8 @ZIF-67 as the framework. The specially designed nitrogen-doped core-shell structure has the advantages of high specific surface area and rough porous surface, which can expose more active sites and facilitate the transfer of electrons and ions on the electrode surface. The high conductivity of ZnSe, CoSe 2 nanoparticles and the synergistic effect of bimetal increase the electrochemical activity and electron mobility of the composite. ZnSe@CoSe 2 /N-C catalyst exhibits outstanding oxygen evolution reaction performance at 1.0 M KOH, which the overpotential is down to 170 mV at 10 mA cm −2 . Furthermore, ZnSe@CoSe 2 /N-C also shows well durability and long-term stability (>113 h). This experiment might open a new path for fabrication of low-cost non-noble metal selenide electrocatalysts for oxygen evolution.
研究领域:
材料科学
·
电化学
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Nanoscale
·
2023
·Vol. 15
·期 46
·18920-18927
·
IF 6.7
Yaru Chen,Rixin Wang,Yanmin Kuang,Yangyang Bian,Fei Chen,Huaibin Shen,Zhen Chi,Xia Ran,Lijun Guo
Understanding the influence of the inner shell on fluorescence blinking and exciton dynamics is essential to promote the optical performances of InP-based quantum dots (QDs). Here, the fluorescence blinking, exciton dynamics, second-order correlation function g2(τ), and ultrafast carrier dynamics of InP/ZnSe/ZnS QDs regulated by the inner ZnSe shell thickness varying from 2 to 7 monolayers (MLs) were systematically investigated. With an inner ZnSe shell thickness of 5 MLs, the photoluminescence quantum yield (PL QY) can reach 98% due to the suppressed blinking and increased probability of multiphoton emission. The exciton dynamics of InP/ZnSe/ZnS QDs with different inner shells indicates that two decay components of neural excitons and charged trions are competitive to affect the photon emission behavior. The probability density distributions of the ON and OFF state duration in the blinking traces demonstrate an effective manipulation of the inner ZnSe shell in the non-radiative processes via defect passivation. Accordingly, the radiative recombination dominates the exciton deactivation and the non-radiative Auger recombination rate is remarkably reduced, leading to a QY close to unity and a high PL stability for InP/ZnSe/ZnS QDs with 5 MLs of the ZnSe shell. These results provide insights into the photophysical mechanism of InP-based QDs and are significant for developing novel semiconductor PL core/shell QDs.
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ACS Nano
·
2023
·
IF 17.1
Qing Li,Hu Hong,Jiaxiong Zhu,Zhuoxi Wu,Chuan Li,Donghong Wang,Pei Li,Yuwei Zhao,Yue Hou,Guojin Liang,Funian Mo,Huilin Cui,Chunyi Zhi
Uncontrollable dendrite formation in the Zn anode is the bottleneck of the commercialization of rechargeable aqueous zinc-based batteries (RAZBs). Interface, the location of the charge transfer process occuring, can significantly affect the further morphology evolution in ways that have not yet been fully comprehended, for example, the crystal facet and orientation of the coating layer. In this study, we demonstrated that the morphology and kinetics of the Zn anode could be tuned by the crystal facet. The fabricated textured ZnSe (T-ZnSe) layer can significantly enhance the reaction kinetics and induce uniform (0002)Zn deposition. In stark contrast, the polycrystalline P-ZnSe coating hinders the charge transfer process at the interface. With this T-ZnSe@Zn as the anode, the full cell with an I2 cathode and a practical areal capacity (2 mAh cm–2) can work well for 900 cycles. The effectiveness of this anode has also been testified by a pouch cell with an overall capacity of 150 mAh. This research contributes to the understanding of the interface and the feasible strategy for the practical application of the Zn anode.
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Daming Gong,Shouwu Xu,Kaili Zhang,Lili Du,Ping Qiu
Photocathodic protection (PCP) performance is restricted by the photogenerated charges separation efficiency. This study reported a facile approach to enhance PCP performance. Na 2 S, Na 2 SO 3 , Na 2 S 2 O 3 , Na 2 SO 4 , and NaCl was selected as sacrificial agents, in which the PCP performance is characterized by coupling TiO 2 and TiO 2 /ZnSe composites with 304 stainless steel. TiO 2 /ZnSe photoanode presented the best PCP performance in Na 2 S media. The maximum potential drop is 466.7 mV, which is about 3.5 times higher than that of in NaCl media. The corresponding photocurrent density is 270.7 μA/cm 2 , which is about 10 times higher than that of in NaCl media. Based on circle voltammetry and ultraviolet photo-electron spectroscopy characterization, it was found that the redox potential of the sacrificial reagent governs the migration and consumption of photogenerated holes of the photoanode.
研究领域:
材料科学
·
电化学
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Journal of Materials Chemistry C
·
2017
·Vol. 5
·期 8
·2107-2113
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IF 5.256
Xiwei Zhang,Jie Mao,Zhibin Shao,Senlin Diao,Dan Hu,Zhenjie Tang,Haihua Wu,Jiansheng Jie
For solar cells, high open circuit voltage is necessary for their high output voltage. Usually, two methods are used to increase the open circuit voltage: using suitable and matched large band-gap materials and reduction of saturation current. Herein, large band-gap p-type ZnSe nanowires and n-type CdS films are used to construct core–shell p–n heterojunctions with high open circuit voltage. Furthermore, a 4 nm Si3N4 layer is inserted between the ZnSe core and the CdS shell in order to passivate the interface defects and to reduce recombination and the saturation current. Additionally, a fast annealing process is employed to reduce the series resistance for improved performance. For a typical device, an optimum high open circuit voltage of ∼1.3 V and an energy conversion efficiency of ∼5.27% were achieved for its photovoltaic operation. Moreover, tens of devices were fabricated to demonstrate their stable and consistent performance.
研究领域:
材料科学
·
光伏技术
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纳米技术
·
半导体器件
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APPLIED SURFACE SCIENCE
·
2015
·
IF 2.711
Xiwei Zhang,Dan Hu,Zhenjie Tang,Dongwei Ma
Single ZnSe–ZnO nanowire axial p–n junction was fabricated by regioselectively oxidizing the p-type ZnSe NW in air. Pronounced current rectification behavior with on/off ratio of ∼50 and ideality factor of ∼1.7 were presented. The axial p–n junction also exhibited high sensitivity to UV light . A high performance UV light photodetector with a responsibility of ∼0.67 × 10 4 A W −1 , a gain of ∼2.3 × 10 4 and a detectivity of ∼4.1 × 10 13 cm Hz 1/2 W −1 were elucidated based on this axial p–n junction. This new method is expected to construct more nano-devices based on one-dimensional semiconductor nanostructures.
研究领域:
纳米材料
·
半导体物理
·
光电子学
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纳米器件
·
光电探测
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Optical Materials Express
·
2017
·Vol. 7
·期 11
·3875-3884
·
IF 2.591
Qin Zhang,Chao Nie,Chun Chang,Chenyang Guo,Xiao Jin,Yuancheng Qin,Feng Li,Qinghua Li
Alloyed CdZnSe/ZnSe quantum dots with a spectral region from 620 to 690 nm are synthesized by a facile one-pot method. The core shell structure for CdZnSe/ZnSe quantum dots are prepared through two Se precursor injections without any purification steps and Zn precursor injections. The emission color is tuned by reaction time, reaction temperature, and the amount of Se. The CdZnSe/ZnSe quantum dots (QDs) show narrow size distribution, wide absorption spectrum, and a high photoluminescence (PL) quantum yield (QY) of up to 50% at room temperature. Electroluminencent light emitting diodes based on the resultant QDs deliver an external quantum efficiency as high as 6.8%.
研究领域:
材料科学
·
光学工程
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MATERIALS RESEARCH BULLETIN
·
2024
·
IF 5.3
Asad Ali,Farhana Akbar Mangrio,Bingyan Qu,Amin ur Rashid,Syed Aamir Hussain,Lixin Zhu,Yuxian Shen,Lei Chen
The selenide-based Van der Waals heterojunctions show great potential for the next generation of photoelectronic nanodevices. Herein, we construct a 2D photoanode nanocatalyst that consists of ZnSe nanocrystals with exposed active surfaces coupled with few-layered InSe nanosheets decorated by Au nanoparticles. The resultant ZnSe/AuNPs@InSe multi-heterojunction photoanode demonstrates an outstanding photocurrent density of 4.86 mAcm −2 under AM 1.5 G simulated sunlight (100 mWcm −2 ), which is 8 times greater than that of the pristine InSe photoanode (0.61 mAcm −2 ). Moreover, the lifetime of photogenerated charge carriers is extended by a factor of 3. This significant enhancement in photoelectrochemical water splitting in the near-infrared region is attributed to the surface plasmonic effect produced by the modification of Au NPs when bulk InSe is exfoliated into multi-layered flakes. The interfacial coupling effects on carrier transfer dynamics, as revealed by impedance spectroscopy assisted with the First-Principal calculations, show that this photoanode significantly minimizes the internal resistance, boosts the charge carrier separation efficiency, and promotes water oxidation.
研究领域:
材料科学
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纳米技术
·
能源科学
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ACS Applied Materials & Interfaces
·
2026
·
IF 7.8
Weng Yuda,Su Yuxian,Kang Dongdong,Lu Jiakai,Yu Shirong,Chen Yi,Kang Yongyin
Environmentally friendly ZnSeTe QDs are attractive candidates for next-generation display and lighting due to their excellent luminescence and composition tunability. However, the substantial reactivity disparity between Se and Te precursors often leads to inhomogeneous Te distribution within ZnSeTe QDs, limiting the color purity and luminescence stability. To overcome these challenges, we developed ZnSeTeS/ZnSe/ZnS gradient alloy QDs to alleviate lattice mismatch and reduce defects, improving the stability and color purity of QDs. The optimized green-emitting QDs exhibit a narrow size distribution (∼5.6 nm), a full width at half maximum (FWHM) of 33 nm, and a photoluminescence (PL) peak at 532 nm, closely approaching the green primary defined by the BT.2020 standard. By adjusting the Te and S incorporation ratios, the PL peaks of the QDs are widely tuned from 420 to 670 nm. Furthermore, through the combination of thiol-ligand exchange and UV lithography, high-precision patterning of the ZnSeTeS/ZnSe/ZnS QDs was achieved with a single pixel size of 20 µm × 20 µm × 2.5 µm, demonstrating broad application prospects in next-generation microdisplay applications such as AR/VR.
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高影响因子
Journal of Nanomaterials
·
2019
·
IF 2.233
Tingting Zhang,Xugu Zhang,Peizhi Yang,Jinke Bai,Chun Chang,Xiao Jin,Feng Zhao,Yan Huang,Feng Li
Stable luminance properties are essential for light-emitting devices with excellent performance. Thermal photoluminescence (PL) quenching of quantum dots (QDs) under a high temperature resulting from a surface hole or electron traps will lead to unstable and dim brightness. After treating CdZnSe/ZnSe QDs with TBP, which is a well-known passivation reagent of the anions, the excess Se sites on the surface of the QDs were removed and their PL quantum yields (QYs) was improved remarkable. Furthermore, after TBP treatment, the CdZnSe/ZnSe QDs exhibit no quenching phenomena even at a high temperature of 310°C. The electroluminescent light-mitting diodes based on the QDs with TBP treatment also demonstrated satisfied performance with a maximum current density of 1679.6 mA/cm2, a peak luminance of 89500 cd/m2, and the maximum values of EQE and luminescence efficiency are 15% and 14.9 cd/A, respectively. The performance of the fabricated devices can be further improved providing much more in-depth studies on the CdZnSe/ZnSe QDs.
研究领域:
材料科学
·
光学工程
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Shuaiqiang Liu,Yu Li,Yan Yue,Huazhao Yang,Chuanmin Ding,Junwen Wang,Donghong Duan,Qinbo Yuan,Xiaogang Hao,Shibin Liu
Development of low-cost, efficient, and stable oxygen evolution electrocatalysts is crucial for the conversion and storage of renewable energy. Therefore, an effective integrated heterostructure catalyst is needed to achieve a lower overpotential during oxygen evolution process. In this paper, cobalt-zinc bimetallic MOF precursors are used as templates to prepare bimetallic cobalt-based selenides with good oxygen evolution catalytic activity and stability on carbon fiber paper. Due to the high specific surface area and porous structure of the coupling structure of nanorods and polyhedra, and the strong electronic coupling between CoSe 2 and ZnSe on nanorods. CoSe 2 -ZnSe/CP exhibits excellent electrocatalytic activity in 1 M KOH solution. It only requires an overpotential of 275 mV to reach the current density of 10 mA cm -2 , and the Tafel slope is 68.9 mV dec -1 . In addition, after 12 h of continuous operation of CoSe 2 -ZnSe/CP, the activity decay of the catalyst is negligible. This work provides a method for the design of heterogeneous bimetallic selenide integrated oxygen evolution electrocatalysts.
研究领域:
材料科学
·
电化学
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