INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2019
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IF 4.084
Yunlong Zhou,Xiaoyuan Ye,Dongyao Lin
As an increasing number of photocatalysis are developed, non-noble metal photocatalysts that can be synthesized from earth-abundant and low-cost materials have received a great deal of attention. In this study, non-noble metal WS 2 /g-C 3 N 4 photocatalysts were prepared by a facile one-pot synthesis. Varying masses of tungsten disulfide (WS 2 ) were successfully loaded onto g-C 3 N 4 and characterized by X-ray diffraction (XRD), inductively coupled plasma optical emission spectrometry (ICP-OES), thermogravimetric analysis (TGA), Fourier transform infrared (FT-IR) spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). These results indicated that the WS 2 was successfully synthesized and immobilized closely on the surface of g-C 3 N 4 to form a sheet-like nanostructure . The H 2 generation results showed that the optimal photocatalyst was 0.3-WCN because it had the highest photocatalytic H 2 production of 154 μmol h −1 g −1 , which is 34 times higher than bare g-C 3 N 4 and even higher than 0.3 wt% platinum-loaded g-C 3 N 4 . Additionally, the possible mechanism of the photocatalyst was studied by photoluminescence (PL), UV–vis diffuse reflectance spectroscopy (UV–vis DRS) and photoelectrochemical tests, which showed that the WS 2 played a key role in improving the efficiency of separation and migration of the photogenerated carriers in g-C 3 N 4 .
研究领域:
材料科学
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环境科学
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化学工程
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DOI
高影响因子
Journal of Materials Chemistry B
·
2022
·Vol. 10
·期 35
·6752-6757
·
IF 7.571
Chengyi Hong,Jingjing Wang,Yuying Wang,Zhiyong Huang,Hongfen Yang,Dan Yang,Ren Cai,Weihong Tan
β-Lactoglobulin (β-Lg), a food allergen, can easily cause allergic reactions in infants and young children. Therefore, it is necessary to develop a rapid, sensitive, and selective detection method to protect individuals prone to allergies. In this paper, a fluorescence assay based on WS2 nanosheets and a fluorescent dye (FAM)-labeled β-Lg aptamer was designed to detect β-Lg rapidly with high sensitivity. In the sensing platform, the β-Lg aptamer is adsorbed on the WS2 nanosheet surface by van der Waals forces, which trigger the phenomenon of fluorescence resonance energy transfer (FRET) and suppress the fluorescence signal in the system. When β-Lg is present, the conformation of the aptamer specifically bound to β-Lg changes. Therefore, the aptamer is separated from the WS2 nanosheet surface, and the fluorescence signal is recovered. This method combines the high quenching efficiency of WS2 nanosheets and good specificity of the β-Lg aptamer. The detection range of this method for β-Lg is 0.1–100 μg mL−1. The detection limit is 20.4 ng mL−1. This method exhibits high sensitivity, selectivity and good reproducibility, and it can be used for β-Lg detection in actual samples.
研究领域:
食品科学
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分析化学
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纳米技术
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生物技术
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DOI
PubMed
高影响因子
MICROCHIMICA ACTA
·
2018
·Vol. 185
·期 10
·1-8
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IF 5.705
Zhou Yunlei,Sui Chengji,Yin Huanshun,Wang Yue,Wang Minghui,Ai Shiyun
A method is described for photoelectrochemical determination of chloramphenicol (CLOA). It is based on the use of (a) aptamers protected with photoactive WS 2 nanosheets, and (b) DNase I-assisted target recycling. The DNA aptamer without label was employed for recognition of CLOA. In the absence of CLOA, the aptamer is adsorbed on the surface of WS 2 . This leads to a decrease of photocurrent due to the steric-hindrance effect of aptamer DNA. The adsorption of WS 2 also protects the aptamer from digestion by DNase. In the presence of CLOA, the aptamer will be desorbed from the WS 2 surface due to formation of an aptamer/CLOA conjugate. This results in an increased photocurrent due to a decreased amount of aptamer DNA on the electrode surface. The increase of photocurrent can be further improved by applying DNase triggered catalytic recycling of CLOA. Under optimal experimental conditions, the response is linear 10 pM – 10 nM CLOA concentration range, with a 3.6 pM lower detection limit (at 3σ). This method is acceptably selective, accurate and stable. It was applied to the determination of CLOA in spiked milk samples and gave satisfactory results.
A simple and sensitive photoelectrochemical apta-biosensor was fabricated for chloramphenicol detection. In this work, WS 2 nanosheets were employed as photoactive material, and DNase I catalytic chloramphenicol recycling strategy was adopted to amplify the detection signal.
研究领域:
分析化学
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生物传感器
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环境科学
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食品安全
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DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF PHARMACEUTICS
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2023
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IF 5.8
Zheng Chen,Xiaoyi Zheng,Jiulong Zhao,Jingwen Tang,Lianghao Hu,Shige Wang
Glucose is used as an important nutrient to support cell growth. The glucose oxidase (GOx) can transform glucose into gluconic acid and toxic H 2 O 2 , which can be used for tumor starvation therapy. However, the leakage of GOx may cause severe side effects to the normal tissue. To prevent the accidental leakage of GOx, this study proposes the chemical modification of GOx on the photothermal transducing agent surface, to realize the safe and combined starvation and photothermal therapy of colorectal tumors . Polyvinylpyrrolidone (PVP)-modified WS 2 nanobowls (WS 2 -PVP) as a photothermal transducing agent were produced using a one-pot preparation method. Then, α-lipoic acid (LA) molecules were immobilized at the sulfur-deficient sites on the surface of WS 2 nanobowls to afford the chemical loading of GOx through amide bonds. Under the irradiation of a near-infrared laser (808 nm), thermal energy is generated by WS 2 to kill colorectal cancer cells locally. The photothermal conversion efficiency of WS 2 -PVP-LA was 27.2%. This study is anticipated to open up an alternative avenue for the rational design of multifunctional nanotherapeutics for tumor therapy.
研究领域:
生物医学工程
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肿瘤学
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纳米医学
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DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Jiapeng Xu,Chaoqiang Liu,Lijuan Fu,Qingyu Liu,Seeram Ramakrishna,Wei Tang
In this work, CuO nanosheets are synthesized by one-step hydrothermal method and CuO/WS 2 heterostructures are fabricated by introducing CuO doping into WS 2 , the preparation method was employed to enhance the performance of the gas sensor. The CuO/WS 2 heterostructure nanocomposite sensor, doped with 5 % CuO, exhibited a pronounced enhancement in its response to 30 ppm of ammonia gas at ambient temperature, increasing the response value from 3.8 observed in pure WS 2 -based sensors to 4.7. Specifically, the response time of the CuO/WS 2 heterostructure-based gas sensor decreased to 180 s, whereas the WS 2 -based sensor required 350 s for NH 3 detection at room temperature. Furthermore, the CuO/WS 2 sensor demonstrated outstanding selectivity for ammonia, maintaining stability over a 90-day test with a response fluctuation of less than 5 %. The heterojunction formed by CuO and WS 2 showed superior sensitivity to NH 3 compared to pristine WS 2 , owing to a notable enhancement in the surface catalytic effect. It also displayed sensitivity to humidity, with a response value of 6.25 at a 71 % relative humidity. At last, the gas sensing and enhanced gas sensing performance mechanisms of the composites for NH 3 were elucidated. This remarkable multi-functional performance offers valuable insights for the advancement of room temperature gas sensors with diverse sensing functionalities.
研究领域:
材料科学
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传感器技术
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产品关联
DOI
高影响因子
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
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2017
·
IF 1.342
Li-li ZHENG,Xin-yan XIAO,Yang LI,Wei-ping ZHANG
TiO 2 /WS 2 /g-C 3 N 4 composite photocatalysts were synthesized by a liquid-exfoliation-solvothermal method. In this process, the WS 2 /g-C 3 N 4 nano-sheets were prepared by liquid-exfoliation method from the bulk WS 2 and C 3 N 4 in the alcohol system, and then the TiO 2 nanoparticles (NPs) grew on the WS 2 /g-C 3 N 4 nano-sheets by in-situ synthesized technique. The photocatalytic activity of the as-prepared samples was evaluated by photocatalytic degradation of methyl orange (MO). The results showed that the as-prepared samples exhibited higher photocatalytic activities as compared to the pure TiO 2 , g-C 3 N 4 and TiO 2 /g-C 3 N 4 composite. The enhanced photocatalytic activities of TiO 2 /WS 2 /g-C 3 N 4 photocatalysts could be attributed to the synergistic effect of heterostructure between TiO 2 NPs and WS 2 /g-C 3 N 4 nano-sheets, which could efficiently improve the separation of photogenerated electron/hole pairs and utilization efficiency of photons. The quenching tests of radicals indicated that ·O − 2 had crucial effect on degradation of MO, which demonstrated that ·O − 2 was the main active radical in photocatalytic reaction process.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2022
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IF 14.224
Xiaojie Wei,Chengbin Liu,Hehe Qin,Ziwei Ye,Xinru Liu,Boyang Zong,Zhuo Li,Shun Mao
Antibiotic residues cause increasing concern in environmental ecology and public health, which needs efficient analysis strategy for monitoring and control. In this study, a fast, specific, and ultrasensitive sensor based on field-effect transistor (FET) has been proposed for the detection of ampicillin (AMP). The sensor involves monolayer tungsten disulfide (WS 2 ) nanosheet as the sensing channel, single-stranded DNA (ssDNA) as the sensing probe, and gold nanoparticle (Au NP) as the linker. The WS 2 /Au/ssDNA FET sensor responds rapidly to AMP in a wide linear detection range (10 −12 –10 −6 M) and has low limit of detection (0.556 pM), which meets the permissible standards of AMP in water and food. The sensing mechanism study suggests that the excellent sensor response results from the increased number of negative charges in the Debye length and the consequent accumulation of holes in WS 2 channel after the addition of AMP. Moreover, satisfactory sensing performance was confirmed in real water samples, indicating the potential application of the proposed method in practical AMP detection. The reported FET sensing strategy provides new insights in antibiotic analysis for risk assessment and control.
研究领域:
环境科学
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生物医学工程
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产品关联
DOI
PubMed
高影响因子
Frontiers in Materials
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2021
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IF 3.515
Wen Shiya,Deng Shiyu,Chen Kun,Chen Huanjun,Deng Shaozhi
Resonance coupling between plasmonic resonances in metallic nanostructures and excitons in two-dimensional (2D) semiconductors has attracted much recent attention. The 2D semiconductor excitons are sensitive to external stimulus, enabling active tuning on the resonance couplings by physical, such as applying electrostatic gating, thermal scanning, etc., or chemical approaches. Among the others, chemical tuning approach has the advantage of facile implementation, high efficiency, and being capable of large-area tuning. Here, we report on chemical tuning of resonance coupling in heterostructures consisted of individual gold nanorods integrated with monolayer WS2. We showed that by incubating the heterostructures into a bis (trifluoro-methane) sulfonimide (TFSI) solution, the exciton transition strength of the WS2 will be enhanced significantly. As a result, the resonance coupling in the heterostructures evolved from a weak coupling regime to a strong coupling one, with the mode splitting energy increases from 94.96 to 105.32 meV. These findings highlight the potential of chemical treatment as an efficient technique for tailoring the interactions between plasmonic nanostructures and 2D semiconductors.
研究领域:
材料科学
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纳米技术
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光学
·
化学
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DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2023
·
IF 8.4
Qiyilan Guang,Jianwei Zhang,Baoyu Huang,Nan Wang,Xiaogan Li
The WS 2 microflakes heterostructured with n-type Fe 3 O 4 have been explored herein for chemiresistive-type NH 3 sensors at room temperature . The microjunctions formed between the two heteromaterials WS 2 and Fe 3 O 4 effectively modulate the response of the sensor to ammonia. The Fe 3 O 4 /WS 2 heterostructured sensor found a three times higher response relative to the single WS 2 based one. The optimized concentration of Fe 3 O 4 in the heterostructure sample is 0.2 at%. The sensor also indicates an excellent selectivity to several volatile organic compounds (VOCs) such as formaldehyde, toluene, methanol, ethanol, and acetone . The sensing mechanism of the sensor to NH 3 at room temperature were examined using in-situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). It reveals that the redox reactions of NH 3 on Fe 3 O 4 /WS 2 were more prominent compared to the WS 2 alone. The enhanced sensitivity of the Fe 3 O 4 /WS 2 based sensor could thus be attributed to the joint effects of both electronic and chemical sensitizations induced by the Fe 3 O 4 /WS 2 heterostructures.
研究领域:
材料科学
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传感器技术
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纳米材料
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产品关联
DOI
高影响因子
FUEL
·
2023
·
IF 7.4
Rongxin Cao,Hui Yuan,Ning Yang,Qihong Lu,Yuxiong Xue,Xianghua Zeng
Two-dimensional sulfide is considered as one of the best alternative for noble metal cocatalyst, whereas few-layered 1T WS 2 structure is very helpful to promote the photocatalytical activity for hydrogen generation. Herein, few-layered 1T-WS 2 /g-C 3 N 4 composites have been prepared via a facile one-step calcination route and used as a noble metal-free catalyst for H 2 evolution. The results showed that the optimized 1T-WS 2 /g-C 3 N 4 has a H 2 evolution rate of 10.08 mmol∙g −1 h −1 , which is 180 and 2.44 times larger than that of pure pristine g-C 3 N 4 and g-C 3 N 4 (Pt), respectively. The enhanced photocatalytic activity can be explained as the optimized 1T-WS 2 /g-C 3 N 4 sample has an increased light absorption (from visible to infrared region), better electrical conductivity and high density of active sites. The studies will be helpful for constructing high efficient heterostructured catalysts by loading 1T phase metal dichalcogenides 2D of material onto a two-dimensional material surface.
研究领域:
材料科学
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能源化学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Junhao Huang,Qingyong Tian,Huajian Feng,Chao Xue,Jun Li,Qun Xu
Construction of photocatalysts with efficient light-harvesting and charge separation properties for boosting photocatalytic hydrogen (H 2 ) evolution is still a challenge. Herein, a three-dimensional (3D) porous WS 2 @C@ZnIn 2 S 4 skeleton heterojunction is successfully synthesized by epitaxial growth of ZnIn 2 S 4 nanosheets on the WS 2 @C skeleton. The optimal WS 2 @C@ZnIn 2 S 4 photocatalyst exhibits considerable photocatalytic H 2 evolution rate (11.15 mmol·g −1 ·h −1 ) and CO 2 -to-CH 4 production performance (43.29 μmol·g −1 ), respectively. The high photocatalytic performance can be ascribed to the fact that multiple light reflection and scattering behaviors originated from 3D architecture facilitates to prolong the interaction length between photons and catalyst, which significantly enlarging the light-harvesting ability and utilization efficiency. Importantly, highly conductive WS 2 @C skeleton can drive photo-induced charge transportation from ZnIn 2 S 4 to WS 2 co-catalyst via the interfacial charge-transfer pathways. The DFT calculations further demonstrate the promotional effects of multiple diffuse reflection and separation of photo-generated carriers in photocatalytic H 2 evolution.
研究领域:
材料科学
·
能源科学
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产品关联
DOI
高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 8
·1267
·
IF 5.719
Gang Lu,Changgeng Shuai,Yinsong Liu,Xue Yang,Xiaoyang Hu
To adapt to the complex application of polyurethane bearings, it is feasible to improve the tribological performance of single polyurethane-based friction materials through the synergistic effect produced by multi-component-lubricating fillers. In this context, rather than using tungsten disulfide (WS2), which has demonstrated excellent self-lubricating performance as a lubricating oil additive, this paper proposes that WS2and single-walled carbon nanotubes (SWNTs) can be designed for addition into a polyether 4,4′-diphenylmethane diisocyanate (MDI) polyurethane matrix as self-lubricating fillers so as to explore the synergistic effect of micro- and nano-lubricating fillers on the tribological performance of polyurethane matrix materials. Through a series of characterizations and tests, it was found that the dispersion of two-component-lubricating additives in a polyurethane matrix is improved when the ratio of WS2to SWNTs is roughly 2:1. In this case, the tribological performance of polyurethane matrix composites is more satisfactory than at other ratios. In addition, compared with the blank sample, the tribological performance of the synergistically modified polyurethane composites under dry friction is more significantly improved with the increase in contact load, while there is no significant improvement under water lubrication. Aside from contributing to the idea of exploring the synergistic effect of WS2and other micro or nanofillers, this method also opens up the possibility of practically applying WS2in the field of friction.Keywords:polyurethane elastomer;WS2;SWNTs;synergistic effect;tribological performance
研究领域:
材料科学
·
摩擦学
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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）