APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2024
·Vol. 130
·期 6
·1-10
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IF 2.5
He Yu,Li Xin,Guo Yangyang,Mao Huibing,Chen Ye,Wang Jiqing
The ZnS: Ho 3+ , Yb 3+ , Mn 2+ nanomaterials fabricated by the co-precipitation method have the zinc-blende structure with the crystallite size about 90 ∼ 100 nm. The X-ray diffraction (XRD), the scanning electron microscope (SEM) and the transmission electron microscope (TEM) characterizations confirm that the doping of the Mn 2+ has less effect on the structure of the ZnS: Ho 3+ , Yb 3+ , Mn 2+ nanomaterials. With the excitation of a 978 nm laser, the upconversion (UC) emissions of the ZnS: Ho 3+ , Yb 3+ , Mn 2+ nanomaterials include two emission bands located at 551 and 664 nm, which correspond to the transitions 5 F 4 ( 5 S 2 )→ 5 I 8 and 5 F 5 → 5 I 8 of the Ho 3+ ions. The UC emission characterization confirms that the UC emission of the ZnS: Ho 3+ , Yb 3+ nanomaterials can be modulated by the doping of the Mn 2+ ions, the increase of the incident laser power and the change of the laser pulse-width. The red emission of the ZnS: Ho 3+ , Yb 3+ nanomaterials particle will increase significantly with the incorporation of the Mn 2+ ions. The incident laser power and the laser pulse-width also can modulate the intensity ratio G / R of the green to the red. With the increase of the incident laser power, the emission intensity ratio G / R will also increase. With the increase of laser pulse-width from 0.2 to 0.8 ms, the above intensity ratio G/R will decrease significantly. The modulation between the green and red emission is due to the energy transfer from the 5 F 4 ( 5 S 2 ) state to the 5 F 5 state of the Ho 3+ ions through the state 4 T 1 of the Mn 2+ ions.
研究领域:
材料科学
·
光学
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产品关联
DOI
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2021
·Vol. 329
·期 2
·1125-1133
·
IF 1.371
Wu Fan,Zhang Zhibin,Cheng Zhongping,Zhou Runze,Lin Yuling,Liu Yuhui,Wang Youqun,Cao Xiaohong,Liu Mingguang,Liu Yunhai
The photocatalytic reduction of soluble \({\text{UO}}_{2}^{2 + }\) from radioactive wastewater is becoming an effective method to reduce radioactive pollution, while available catalysts are considerable limitation. Herein, the ZnS@g-C 3 N 4 (ZSGCN) heterojunctions complexes were compounded as catalysts to reduce \({\text{UO}}_{2}^{2 + }\) . The results from TEM, XRD, XPS, EIS, DRS and PL showed that the ZnS nanoparticles combined with graphite carbon nitride (GCN), which is the construction of heterojunctions broadened the absorption range of sunlight. The ZSGCN-5 presented the optimal photocatalytic reduction activity to \({\text{UO}}_{2}^{2 + }\) , which was 4.34 times than that of pristine GCN. The ZSGCN-5 heterojunction becomes a promising photocatalyst for radioactive environment remediation.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
ChemNanoMat
·
2020
·Vol. 6
·期 3
·470-479
·
IF 3.384
Qingrui Luan,Qifeng Chen,Jie Zheng,Ruifang Guan,Yanfen Fang,Xun Hu
Graphical Powered by the Sun : The formation of 2D-ZnS@ZnO Z-scheme heterostructures and introduction of zinc interstitial defects into ZnO was successfully achieved through a facile in-situ ion-exchange hydrothermal method. The photocatalysts exhibited high photocatalytic activity for hydrogen evolution. Heterostructure and defects in photocatalyst play highly important role in photocatalysis. Formation of 2D-ZnS@ZnO Z-scheme heterostructure and introduction of zinc interstitial defects into ZnO were successfully achieved through a facile in-situ ion-exchange hydrothermal approach, and the photocatalysts exhibited high photocatalytic activity for hydrogen evolution. The heterointerface between the highly ordered ZnO core and disordered ZnS shell, and the zinc interstitial, facilitate the transfer and separation of charge carriers, resulting in high photocatalytic activity. The 2D-ZnS@ZnO photocatalyst with a disordered ZnS layer of about 8 nm in thickness exhibited a photocurrent density about 7.2 times than that of ZnO, which is mainly attributed to the facilitative effect on interface transfer and the increased charge density. In addition, the photocatalytic activity can be adjusted via changing the thickness of the disordered ZnS overlayer. This work provides a strategy for the design of the heterointerface photocatalysts combined with defect engineering, through which the photocatalytic activity can be remarkably improved.
研究领域:
材料科学
·
能源化学
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产品关联
DOI
高影响因子
ACTA PHYSICO-CHIMICA SINICA
·
2024
·
IF 10.8
Asif Hassan Raza,Shumail Farhan,Zhixian Yu,Yan Wu
This work illustrates the novelty of double S-scheme ZnS/ZnO/CdS ternary heterojunction photocatalyst with efficient photocatalytic activity. The sample with optimal CdS content, ZnS/ZnO/CdS-14% (ZZC14%), displayed the maximum H 2 evolution rate of 4.1 mmol·g ‒1 ·h ‒1 . The maximum photocatalytic performance was approximately 2 and 13 times higher than their corresponding counterparts, ZnS/CdS and ZnO/ZnS, respectively. A high AQE of 19.8% under 420 nm was obtained. Additionally, the slight changes in H 2 evolution activities and retentions of crystal structures after six successive cycles indicate the stability of the photocatalyst. In accordance with the theoretical calculations and experimental results, the remarkable enhancement in photocatalytic activity is attributed to fast electron transfer and separation as well as the intimate contact due to mutual interaction between S-scheme. This work highlights an innovative approach to constructing a dual S-scheme photocatalytic system with high separation and fast migration capabilities of photogenerated charge carriers for splitting water to produce hydrogen. Download: Download high-res image (131KB) Download: Download full-size image
研究领域:
材料科学
·
能源科学
·
环境科学
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Xiaohong Ma,Jiajia Zheng,Huacheng Jin,Xi Zeng,Danyang Li,Feifei You,Jian Qi,Fangli Yuan
The utilization of solar energy to convert CO 2 into small energy molecules is a potential “carbon neutral” technology for CO 2 emission reduction. However, the industrial application is significantly constrained due to the low reduction efficiency, complexity of the synthesis methods, and limitations in scaling up the catalyst materials. In this work, we have successfully designed and synthesized a series of hollow tubular ZnO@ZnS core-sheath heterostructured materials, by combining radio-frequency thermal plasma and hydrothermal treatment technologies. The S:Zn molar ratio, reaction time, and temperature were systematically investigated, and the morphology of intermediate products was successfully captured, which provided conclusive evidence for the proposed formation mechanism. Notably, the photocatalytic CO yield of the ZS 0.5 O hollow nanotube core-sheath composite is not only 3.20 or 4.03 times higher than that of the pure ZnO or ZnS, respectively, but also possesses excellent stability. By in-depth characterization, we found that the hollow core-sheath heterostructure enhances light capture and absorption, exposes more effective active sites, and builds a type-II heterojunction between ZnO and ZnS to enhance the separation efficiency of charge carriers. The synergy of these factors significantly improves the catalytic performance, offering new insights for photocatalytic, electrocatalytic, and photoelectrocatalytic CO 2 reduction.
研究领域:
材料科学
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环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Yong Zhang,Lifa Zhang,Jingdu Bian,Mingcong Tang,Zijian Wang,Qingdong Chen,Dongzhi Zhang
In this paper, the Co/Zn-based zeolite imidazole framework (Co/Zn-ZIF) was synthesized by an etching method. Then, a certain amount of sulfur powder was doped into it and annealed to synthesize ZnS/Co9S8 composites with a core–shell structure mechanism (CS-ZnS/Co9S8). Compared with the single-metal ZIF, which is more studied at present, the application of a bimetallic ZIF shows remarkable excellent performance in gas sensing. The test results show that the sensor with a CS-ZnS/Co9S8 film has ultrahigh sensitivity to ammonia. At its optimal operating temperature of 240 °C, the detection limit of ammonia concentration can be detected to be 0.2 ppm. At the same time, the response of the CS-ZnS/Co9S8 thin-film sensor to 5 ppm concentration of ammonia is 4.56, which is 2.85 times and 3.26 times that of the single ZnS and Co9S8 thin-film sensors. In addition, the CS-ZnS/Co9S8 thin-film sensor has a response/recovery time of 7 s/9 s and has excellent repeatability, long-term stability, selectivity, and antihumidity interference. In addition to the polyhedral core–shell mechanism formed by ZnS/Co9S8, the p–n heterojunction directly formed by ZnS and Co9S8 is also a very important factor for the substantial improvement of its sensing performance.
研究领域:
材料科学
·
传感技术
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纳米技术
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产品关联
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2014
·
IF 1.968
Xin Zhou,Xianghua Zeng,Xiaoqing Yan,Weiwei Xia,Yuxue Zhou,Xiaoshuang Shen
Single-crystalline ZnS nanoparticles with a zinc-blende crystal structure have some microdefects such as stacking faults and nanotwins. In contrast, ZnS nanorods have a wurtzite crystal structure, which grows along the [0 0 0 1] direction, although some nanorods display the intergrowth of a minor zinc-blende phase and the major wurtzite phase, which forms stacking faults or zinc-blende/wurtzite ZnS nanotwins. Raman spectroscopy measurements reveal surface phonons and longitudinal optical phonons in the nanoparticles, nanorods and doublet phonons that are associated with the transversal optical phonons of the A1 and E1 modes in only the nanorods. The first-order longitudinal optical phonon mode exhibits a blueshift of 6 cm −1 when the particle size increases from 5 to 15 nm, but there is no shift in the range of 15–30 nm because of quantum confinement and microdefects.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Analytical Methods
·
2013
·Vol. 5
·期 21
·6094-6099
·
IF 1.855
Jing Ma,Fang Wang,Meng Fan,Tianyi Wang,Wei Bian,Shaomin Shuang
The room temperature phosphorescence (RTP) of quantum dots (QDs) offers many advantages compared with fluorescence, such as a longer emission lifetime, wider gap between excitation and emission spectra and minimal interference. Hence, the RTP properties of QDs and their potential for phosphorescence detection have drawn more and more attention. In this paper, N-acetyl-L-cysteine (NAC)-capped Mn-doped ZnS QDs were synthesized by a hydrothermal method. The QDs displayed a strong phosphorescence emission peak at 590 nm upon excitation at 315 nm. Because their RTP was efficiently quenched by hydrochlorothiazide (HCT), a novel RTP method for determination of HCT was developed. The results showed that under the optimized conditions, the changes of RTP intensity showed a good linear relationship with the concentration of HCT in the range of 2.5 to 95 μM, with a limit of detection of 1.25 μM and relative standard deviation of 0.44%. The related theories preliminarily demonstrated the dynamic quenching mechanism. In addition, this method was successfully applied to the analysis of practical samples. The recovery of spiked solutions ranged from 94–104%.
研究领域:
分析化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2025
·
IF 7.7
Yujun Guo,Jiayi Qu,Zhenkai Zhang,Zhenyue Liu,Chen Yue,Qiuying Chen,Zhiguo Yang,Yang Mu,Xiaoning Wang,Davoud Dastan,Xi-Tao Yin,Xiaoguang Ma
In this paper, ZnS/NiO p-n heterojunction microspheres were fabricated via a two-step hydrothermal approach. The sensing properties of composites with different ZnS contents were investigated by regulating the ratio of Zn. When containing 25 mol% ZnS, the ZnS/NiO nanosphere sensor achieved a response of 125. The response was improved by a factor of about 83.3 compared to pure NiO. The sensor functions optimally at a temperature of 225 ℃, and it possesses excellent selectivity, a rapid response/recovery time (49/44 s), and long-term stability. Therefore, this paper provides a hydrothermal method to prepare ZnS/NiO nanocomposites with heterojunction, specifically designed to detect n-butanol. After performing a series of characterizations, it was determined that the enhancement of the gas-sensitive properties could be related to the construction of ZnS/NiO heterojunctions and the increase in oxygen vacancies.
研究领域:
材料科学
·
化学传感器
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2022
·
IF 6.14
Liangliang Zhou,Bin Yu,Lilin Huang,Huiqun Cao,Danying Lin,Yingying Jing,Faiz Wali,Junle Qu
Colloidal quantum dots (QDs) are vital fluorescent probes with several optical features superior to those found in organic dyes for microscopy imaging. However, the emission blinking behavior of a single QD is an intrinsic drawback for stimulated emission depletion microscopy (STED) or structured illumination microscopy techniques. Herein, we present a rational strategy for the synthesis of a type of deterministic, environmentally friendly, small nonblinking core–multishell InP/ZnSe/ZnS QD using a hydrofluoric acid (HF) etching passivation. The strategy includes four steps: synthesis of the InP core, synthesis of oil-phase core–multishell InP/ZnSe/ZnS QDs using hydrogen fluoride and trioctylphosphine etching passivation, promotion of the water solubility of QDs modified by 3-mercaptopropionic acid (MPA), and enhanced biotargeting of core–multishell InP/ZnSe/ZnS QDs by surface coupling technology. The suppressed blinking mechanism was primarily attributed to surface wrapping shells and HF etching passivation of surface dangling bonds, which reduced surface nonradiative recombination. Nonblinking QDs exhibit high fluorescence efficiency (∼90%), good photostability (>20 min), a large Stokes shift (>135 nm), biocompatibility of the cell viability (>90%), and high targeting. Furthermore, super-resolution multifocal structured illumination microscopy imaging of subcellular structures labeled using these QDs confirmed a resolution improvement of greater than 2.6-fold compared to wide-field microscopy. The results indicate that the nonblinking QDs can function as excellent probes for use in the long-term super-resolution visualization of subcellular dynamics.
研究领域:
生物成像
·
材料科学
·
光学
✓ 已验证
DOI
高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2021
·Vol. 413
·期 8
·2207-2215
·
IF 4.157
Yin Min,Wang Yan,Gao Xuwen,Du Shichao,Cheng Yan,Yu Shuai,Zou Guizheng,Xue Fumin
We developed a near-infrared (NIR) electrochemiluminescence (ECL) immunosensor for sensitively and selectively determining carbohydrate antigen 125 (CA125) with toxic-element-free and environmental-friendly AgInS 2 /ZnS nanocrystals (NCs) as tags. The core/shell-structured AgInS 2 /ZnS NCs not only can be conveniently prepared via an aqueous synthetic procedure, but also has high photoluminescence quantum yield (PLQY) of up to 61.7%, highly monodispersed, water-soluble, and desired biological compatibility. As AgInS 2 /ZnS NCs can be oxidized via electrochemically injecting holes into their valence band at + 0.84 V, both the monodispersed AgInS 2 /ZnS NCs in solution and the surface-confined AgInS 2 /ZnS NCs immobilized in sandwich-typed immuno-complexes with CA125 as analyte can exhibit efficient oxidative-reduction ECL around 695 nm under physiological conditions with the presence of tri-n-propylamine (TPrA). The ECL intensity from the AgInS 2 /ZnS NCs immobilized in sandwich-typed immuno-complexes increases linearly and selectively with an increased concentration of CA125 from 5 × 10 −6 to 5 × 10 −3 U/mL, and limit of detection (LOD) was 1 × 10 −6 U/mL (S/ N = 3). This reliable platform can provide an effective detection method in the early diagnosis and treatment of ovarian cancer. Graphical abstract
研究领域:
生物医学工程
·
免疫分析
·
纳米材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Mengnan Nie,Chao Zhou,Weiwei Feng,Changhui Xin,Xin Yu,Qian Li
Self-doped Ti 3+ -TiO 2 and amorphous ZnS layers-coated Ti 3+ -TiO 2 nanostructures were successfully fabricated for via a calcination-ultrasonic synthesis strategy for organic pollutant degradation under visible-light illumination. The experimental results revealed that the synthesized Ti 3+ -TiO 2 clusters displayed efficient visible-light absorption and photocatalytic performance. It was also found that amorphous ZnS layers were formed on the coral-like Ti 3+ -TiO 2 clusters via an ultrasonic synthesis method, and the strongly combined interfaces greatly boosted the charge separation between ZnS layers and self-doped Ti 3+ -TiO 2 clusters. The synthesized Ti 3+ -TiO 2 @ZnS-15% heterojunction presented the highest photocatalytic activity with a rate constant of 0.03197 min −1 , approximately 9.87 times of commercial TiO 2 . In addition, the prepared Ti 3+ -TiO 2 @ZnS composites also exhibited highly boosted photocatalytic performance towards ciprofloxacin and tetracycline degradation under visible-light illumination compared with those of commercial TiO 2 , Ti 3+ -TiO 2 , and ZnS samples. Finally, the norfloxacin degradation pathways and visible-light photocatalytic mechanism over nanostructured Ti 3+ -TiO 2 @ZnS heterojunctions were suggested.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）