SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Zhi-Qiang Zhou,Ren Yan,Jie Zhao,Li-Yun Yang,Ji-Lei Chen,Yan-Jun Hu,Feng-Lei Jiang,Yi Liu
The pollution of Hg 2+ is one of the most serious problems to human health due to their high toxicity, mobility, difficulty in degradation and ability of accumulation in ecological systems. Thus, it is of great importance to develop highly selective and sensitive probe for detecting Hg 2+ in aquatic ecosystems. Here we propose a new turn-on strategy for specific recognition and detection of Hg 2+ . Mn-doped ZnSe quantum dots (QDs) with small size (2.1 nm) were prepared and adopted as probe, the small size of doped QDs makes the replacement of Mn 2+ by Hg 2+ accessible, which eliminates the fluorescence quenching effect of superficial Mn 2+ on Mn-doped ZnSe QDs. Different from traditional semiconductor nanocrystals based turn-off probe for detecting Hg 2+ , we realize a turn-on strategy for the selective detection of Hg 2+ by Hg 2+ -Mn 2+ replacement using semiconductor nanocrystals (Mn-doped ZnSe QDs). This turn-on mechanism was verified by fluorescence spectra, ICP-AES and XPS. In the absence of Hg 2+ , Mn-doped ZnSe QDs possessed low fluorescence intensity. With the addition of Hg 2+ , the fluorescence intensity around 600 nm increased dramatically. Our Mn-doped ZnSe QDs exhibits excellent selectivity and sensitivity for Hg 2+ . The limit of detection is 7.0 nM, which is lower than the mercury toxic level defined by the U.S. Environmental Protection Agency (10 nM). The result of Hg 2+ detection in real samples indicates the feasibility and sensitivity of our probe for application in environmental samples.
研究领域:
环境科学
·
分析化学
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产品关联
DOI
高影响因子
Nano Research
·
2024
·
IF 9.5
He Jinhua,Wang Chenhui,Liu Mingrui,Ramzan Muhammad,Long Zhiwei,Wu Xian-gang,Chen Yu,Zhong Haizheng
The potential use of large-size ZnSe quantum dots as blue emitters for display applications has greatly inspired the colloidal synthesis. Herein, we report the negative effects of side reactions of large-size ZnSe quantum dots. The side reactions between oleic acid and oleylamine generated amidation products and H 2 O, which led to the hydrolysis of Zn(OA) 2 to Zn(OH) 2 and the subsequent formation of zinc oxide (ZnO) and zinc bis[diphenylphosphinate] (Zn(DPPA) 2 ) precipitates. These side reactions resulted in the formation of a defective surface including a Se-rich surface and oxygen-related defects. Such negative effects can be overcome by adopting an etching strategy using potassium fluoride and myristic acid in combination. By overcoating a ZnS shell, blue emissive ZnSe/ZnS quantum dots with a maximum photoluminescence quantum yield of up to 91% were obtained. We further fabricated ZnSe quantum dots-based blue light-emitting diodes with an emission peak at 456 nm. The device showed a turn-on voltage of 2.7 V with a maximum external quantum efficiency of 4.2% and a maximum luminance of 1223 cd·m −2 .
研究领域:
材料科学
·
纳米技术
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Chenyuan Zhao,Yuxiang Zhou,Tianyu Shi,Haihong Yin,Changqing Song,Lin Qin,Zhiliang Wang,Haibao Shao,Ke Yu
Although lithium sulfur batteries (LSBs) have high theoretical capacity and energy density , low conductivity of sulfur and the discharge species (Li 2 S 2 , Li 2 S), the polysulfide shuttle and the large volume change hinder the commercialization of LSBs. To tackle the problem, we hydrothermally prepared a special cocklebur-like ZnSe-VO 2 @rGO nanostructure , in which graphene oxide (GO) is active in inducing thorn-like VO 2 nanorods grown on carambola-like VO 2 nanostructures. In this structure, the polar VO 2 and ZnSe quantum dots (QDs) have strong chemical adsorption that can catalyze the polysulfide conversion and alleviate the shuttle effect; besides, the thorn-like VO 2 nanorods act like numerous tentacles that capture polysulfides by increasing the contact area, and the reduced graphene oxide (rGO) nanosheets not only buffer the volume change, but also enhance the conductivity of the framework and improve the ion and electron transfer . Boosted by the synergetic effects of VO 2 , rGO and ZnSe QDs, the ZnSe-VO 2 @rGO/S cathode achieves a high specific capacity of 1026.1 mA h g −1 at 0.2 C and 712.3 mA h g −1 at 2 C. Good cyclic stability was obtained as well, with a high reversible capacity of 820 mA h g −1 and high retention of 89.1 % after cycling at 0.5 C for 150 cycles. Such outstanding performance indicated its good potential for use in advanced LSBs.
研究领域:
材料科学
·
电化学
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产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2023
·
IF 6.4
Baoquan Feng,Yiran Cheng,Chengyan Liu,Jie Gao,Guojing Wu,Xiaobo Bai,Ruifan Si,Wenpei Li,Yue Guo,Lei Miao
Ag2Se-based thermoelectric (TE) materials have attracted significant attention recently due to their potential application near room temperature. Manipulating the stoichiometric ratio of Ag/Se and anion doping are usually used as effective approaches to enhance the TE properties. Here, we report a strategy to simultaneously enhance the power factor (PF) and reduce the thermal conductivity of Ag2Se by introducing ZnSe nano-precipitates. The excessive carrier concentration in the intrinsic Ag2Se is successfully reduced by the Ag interstitial inhibition due to the introduction of secondary-phase ZnSe nano-precipitates, thereby enhancing the PF up to a maximum value of ∼22.2 μW m–1 K–2 at 383 K and decreasing the electronic thermal conductivity from ∼1.2 to ∼0.8 W m–1 K–1 at 383 K. In addition, the phonon scattering at ZnSe nano-precipitates contributes to the reduction of lattice thermal conductivity from ∼0.5 to ∼0.4 W m–1 K–1 at 383 K. As a result, a high peak zT of ∼0.7 at 383 K and an average zT of 0.6 at 313–383 K are obtained in the sample Ag2Se-0.005ZnSe, which is one of the highest values amongst Ag2Se-based TE materials. This study could provide guidance to improve the TE properties of materials similar to Ag2Se.
研究领域:
材料科学
·
热电性能优化
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DOI
高影响因子
FOOD CHEMISTRY
·
2023
·
IF 8.8
Qian Wu,Li Tian,Xiangyu Shan,Huiling Li,Shuning Yang,Chao Li,Juan Lu
In this work, a novel electrochemiluminescence (ECL) sensor based on the CdSe@ZnSe and CNTs was constructed for the detection of melamine. CdSe@ZnSe acted as the co-reaction promoter for the enhancement of Ru(bpy) 3 2+ /tri- n -propylamine (TPrA) system and CNTs acted as carriers to immobilize more CdSe@ZnSe. The initial ECL signal significantly amplified due to the synergistic effect of CNTs and CdSe@ZnSe. The ECL signal decreased with the addition of melamine, and the change value of ECL intensity (ΔI) was linearly related to the logarithm of melamine concentration. The constructed ECL sensor was able to detect melamine in the range of 1.0 × 10 −11 − 1.0 × 10 −7 M, and the detection limit was 3.3 × 10 −12 M (S/N = 3). It can be used to detect melamine in milk samples.
研究领域:
分析化学
·
食品安全检测
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2019
·
IF 6.393
Li Tian,Xuerong Wang,Kexin Wu,Yue Hu,Yue Wang,Juan Lu
A ultrasensitive electrochemiluminescence (ECL) biosensor was designed for the detection of dopamine using ZnSe quantum dots and Ru(bpy) 3 2+ as the signal probes, and graphite oxide and multi-walled carbon nanotube as the supporting matrix. The biosensor exhibits efficient and stable anodic ECL signal (at 1.10 V vs. Ag/AgCl) in phosphate buffer solution (pH 9.0) containing Tripropyl amine. The ECL emission decreases with adding dopamine, which can be attributed to the quenching effect from interaction between ZnSe and dopamine. The possible reaction mechanism of the ECL system is studied, and a method for the determination of dopamine is proposed. Under the optimal experimental conditions, the ECL emission decreases linearly with the logarithm of dopamine concentration in a wide linear range from1 × 10 −9 to 1 × 10 -5 mol L −1 with a detection limit of 6 × 10 -10 mol L -1 (S/N = 3). The biosensor is also successfully applied to detect dopamine in human blood serum samples.
研究领域:
生物传感
·
分析化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Optical Materials
·
2025
·
IF 3.8
Lei Chen,Hui Jiang,Fanghai Liu,Syed Aamir Hussain,Hossein Chamkouri,Yang Song,Ping Chen,Asad Ali,Xianghua Wang
As an alternative to toxic Cd-based blue light-emitting quantum dots (QDs) and chemically unstable perovskite ones, heavy-metal-free and stable ZnSe QDs have great potential for quantum dot light-emitting diode (QLED) displays. Through overcoming the challenge of controllable synthesis of ZnSe QDs with desirable properties, this work reported the synthesis of super-narrow-band blue-emitting ZnSe/ZnS core/shell QDs with full width at half-maximum (FWHM) of photoluminescence/electroluminescence as narrow as 19/20 nm, peaked at 446/449 nm, respectively. The crystallization of the core/shell QDs was well controlled by systematic optimization on the molar ratios of cations to anions and the amount of precursor addition. The coating shell of ZnS, which has a wider band gap than ZnSe, could effectively suppresses the fluorescence tail in the emission spectrum that is caused by defects on the ZnSe core surface, narrowing the FWHM of the emission spectrum and increasing the fluorescence quantum yield of ZnSe/ZnS core/shell QDs. The prepared QLED using ZnSe/ZnS core/shell QDs exhibits superior color purity, particularly suitable for display applications. This work opens up a new route to synthesizing heavy-metal-free ultra-narrow-band blue-emitting QDs.
研究领域:
纳米技术
·
材料科学
·
光电子学
·
显示技术
·
量子点
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产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2018
·Vol. 20
·期 28
·4020-4024
·
IF 3.304
Xin Huang,Yu Zou,Jian Hao,Jiang Jiang
Uniform ZnSe hollow nanospheres with face-centered cubic structure were synthesized via a post-synthetic chemical transformation reaction from solid Cu2−xSe nanocrystals, with the help of tributylphosphine at room temperature under an ambient atmosphere. The formation of ZnSe hollow structure was based on the synergetic effect of isotropic cation exchange from Cu2−xSe to ZnSe and concurrent selective etching of Cu2−xSe templates through anion extraction. The degree of hollowness could be adjusted by changing the feed molar ratio of Zn/Cu and reaction temperature which determined the extent of cation exchange. These ZnSe hollow nanospheres exhibited excellent catalytic activity and stability for the photodegradation of dyes.
研究领域:
材料科学
·
化学工程
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产品关联
DOI
高影响因子
ChemSusChem
·
2024
·
IF 7.5
Guorui Ma,Haiqiang Mu,Zhenli Lv,Jiaxing Guo,Min Zhu,Yonghong Li,Xiaozhong Wang,Jing Li,Feng Li
Graphical In the work, a Bi/ZnO@ZnSe photocathode with a lattice-matching interface and long-life high-energy photoelectrons is designed for the photoelectrocatalytic conversion of CO 2 to CO, which achieves a Faradaic efficiency of 88.9 % at −0.9 V vs. RHE and demonstrates excellent stability. The key aspect of the photoelectrochemical CO 2 reduction reaction (PEC CO 2 RR) lies in designing cathode materials that can generate high-energy photoelectrons, enabling the activation and conversion of CO 2 into high-value products. In this study, a coaxially wrapped ZnO@ZnSe array heterostructure was synthesized using a simple anion exchange strategy and metallic Bi nanoparticles (NPs) were subsequently deposited on the surface to construct a Bi/ZnO@ZnSe photocathode with high CO 2 conversion capability. This array photocathode possesses a large aspect ratio, which simultaneously satisfies a low charge carrier migration path and a large specific surface area that facilitates mass transfer. Additionally, the barrier formed at the n-n heterojunction interface hinders the transfer of high-energy photoelectrons from ZnSe to lower energy levels, resulting in their rapid capture by Bi while maintaining a relatively long lifetime. These captured electrons act as active sites, efficiently converting CO 2 into CO with a Faradaic efficiency above 88.9 % at −0.9 V vs. RHE and demonstrating superior stability. This work provides a novel approach for synthesizing high-energy photoelectrode materials with long lifetimes.
研究领域:
材料科学
·
电化学
·
能源转换
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Jianguang Jia,Chunmei Liu,Yuan Lin,Xiaowen Zhou
Charge recombination is an important factor that limits the cell efficiency of quantum dot sensitized solar cells (QDSSCs). Herein, we report a facile way to improve the cell performance of CdSe sensitized ZnO QDSSC by overcoating a thin layer of ZnSe on CdSe/ZnO film through a successive ionic layer adsorption and reaction (SILAR) procedure. Photovoltaic investigations indicate that ZnSe overcoating can increase photocurrent and photovoltage of the cell, resulting in significant enhancement of the cell efficiency, which is much better than the widely used traditional ZnS material. The superior role of ZnSe overcoating is ascribed to its large inhibition of charge recombination loss owing to its suitable band structure, efficient passivation of ZnO and CdSe QDs as well as its small lattice mismatch with CdSe that leads to the large decrease of surface/interface defects in CdSe/ZnO photoanode . This finding provides an alternative efficient way to enhance the cell performance of ZnO based QDSSC by suppressing the charge recombination.
研究领域:
材料科学
·
纳米科技
·
能源化学
·
半导体物理
·
光伏技术
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS CHEMISTRY
·
2011
·Vol. 21
·期 18
·6736-6741
·
IF 5.101
Xiwei Zhang,Jiansheng Jie,Zhi Wang,Chunyan Wu,Li Wang,Qiang Peng,Yongqiang Yu,Peng Jiang,Chao Xie
Single-crystal p-type ZnSe nanowires (NWs) with zinc blende structure and [21–1] growth direction were synthesized by using bismuth (Bi) as dopant via a thermal co-evaporation method. The ZnSe : Bi NWs showed evident p-type conductivity with hole concentration up to 4.1 × 1018 cm−3 after the acceptor activation. Negative photoconductivity was first investigated in the p-ZnSe NWs, i.e., the conductivity of the NWs under light was dramatically lower than that in the dark. Surface effects arising from oxygen absorption and photo-desorption were suggested to be responsible for this. By using Al as the Schottky gate, high-performance nano-metal-semiconductor field-effect transistors (nanoMESFETs) were constructed, and measurements on the Al/p-ZnSe NW Schottky diode also revealed the bias-dependent photoresponse. It is expected that the p-type ZnSe : Bi NWs will have great potential in nano-optoelectronic applications.
研究领域:
材料科学
·
半导体物理
·
纳米技术
·
光电子学
·
凝聚态物理
✓ 已验证
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2014
·
IF 2.129
Chang Shu,Li Ding,Wenying Zhong
In the current work, using ZnSe ZnS quantum dots (QDs) as representative nanoparticles, the affinities of seven anticancer drugs for bovine serum albumin (BSA) were studied using fluorescence resonance energy transfer (FRET). The FRET efficiency of BSA–QD conjugates can reach as high as 24.87% by electrostatic interaction. The higher binding constant (3.63 × 10 7 L mol −1 ) and number of binding sites (1.75) between ZnSe ZnS QDs and BSA demonstrated that the QDs could easily associate to plasma proteins and enhance the transport efficacy of drugs. The magnitude of binding constants (10 3 –10 6 L mol −1 ), in the presence of QDs, was between drugs–BSA and drugs–QDs in agreement with common affinities of drugs for serum albumins (10 4 –10 6 L mol −1 ) in vivo. ZnSe ZnS QDs significantly increased the affinities for BSA of Vorinostat (SAHA), Docetaxel (DOC), Carmustine (BCNU), Doxorubicin (Dox) and 10-Hydroxycamptothecin (HCPT). However, they slightly reduced the affinities of Vincristine (VCR) and Methotrexate (MTX) for BSA. The recent work will not only provide useful information for appropriately understanding the binding affinity and binding mechanism at the molecular level, but also illustrate the ZnSe ZnS QDs are perfect candidates for nanoscal drug delivery system (DDS).
研究领域:
生物化学
·
药理学
·
纳米医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）