Nanomaterials
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2019
·Vol. 9
·期 9
·1312
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IF 4.034
Feng Huang,Jing Zhou Li,Zhu Hua Xu,Yuan Liu,Ri Peng Luo,Si Wei Zhang,Peng Bo Nie,Yan Fei Lv,Shi Xi Zhao,Wei Tao Su,Wen Di Li,Shi Chao Zhao,Guo Dan Wei,Hao Chung Kuo,Fei Yu Kang
Two-dimensional (2D) tungsten disulfide (WS2) has inspired great efforts in optoelectronics, such as in solar cells, light-emitting diodes, and photodetectors. However, chemical vapor deposition (CVD) grown 2D WS2domains with the coexistence of a discontinuous single layer and multilayers are still not suitable for the fabrication of photodetectors on a large scale. An emerging field in the integration of organic materials with 2D materials offers the advantages of molecular diversity and flexibility to provide an exciting aspect on high-performance device applications. Herein, we fabricated a photodetector based on a 2D-WS2/organic semiconductor materials (mixture of the (Poly-(N,N′-bis-4-butylphenyl-N,N′-bisphenyl) benzidine and Phenyl-C61-butyric acid methyl ester (Poly-TPD/PCBM)) heterojunction. The application of Poly-TPD/PCBM organic blend film enhanced light absorption, electrically connected the isolated WS2domains, and promoted the separation of electron-hole pairs. The generated exciton could sufficiently diffuse to the interface of the WS2and the organic blend layers for efficient charge separation, where Poly-TPD was favorable for hole carrier transport and PCBM for electron transport to their respective electrodes. We show that the photodetector exhibited high responsivity, detectivity, and an on/off ratio of 0.1 A/W, 1.1 × 1011Jones, and 100, respectively. In addition, the photodetector showed a broad spectral response from 500 nm to 750 nm, with a peak external quantum efficiency (EQE) of 8%. Our work offers a facile solution-coating process combined with a CVD technique to prepare an inorganic/organic heterojunction photodetector with high performance on silicon substrate.Keywords:2D-WS2;photodetector;organic semiconductor;responsivity
研究领域:
材料科学
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光电领域
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DOI
PubMed
高影响因子
MATERIALS & DESIGN
·
2019
·
IF 5.77
Ran Cai,Meng Nie,Feng Xu
To facilitate progression from the laboratory to commercial applications, it will be necessary to develop facile and scalable methods to produce high-quality quantum dots (QDs) of layered two-dimensional materials (LTMs). In this paper, we for the first time report a turbulence-induced disintegration method to prepare ultra-small BN and WS 2 QDs, which can easily be achieved only using a household kitchen blender to directly disintegrate their bulk counterparts in liquids. The resulting ultra-small BN and WS 2 QDs exhibit excellent photoluminescence and photo-thermal converting properties, respectively. As proof-of-concept applications, these properties have great promise in cell-imaging probes and photo-thermal therapy. This work not only provides successful paradigms for preparing the QDs of other LTMs but also demonstrates potential applications for the QDs.
研究领域:
材料科学
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生物医学工程
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纳米技术
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DOI
高影响因子
ADVANCED MATERIALS
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2024
·
IF 27.4
Li Zhan,Xudong Pei,Jiachen Tang,Shuaixing Li,Shuo Li,Yuan Li,Lintao Li,Changjin Wan,Yu Deng,Yi Shi,Yufeng Hao,Songlin Li
2D transition-metal dichalcogenide (TMDC) semiconductors represent the most promising channel materials for post-silicon microelectronics due to their unique structure and electronic properties. However, it remains challenging to synthesize wide-bandgap TMDCs monolayers featuring large areas and high performance simultaneously. Herein, highly oriented WS 2 monolayers are reproducibly synthesized through a templated growth strategy on vicinal C/A-plane sapphire wafers. Various spectroscopic characterizations confirm the high crystallographic orientation and uniformity across the entire wafers. Electronic measurements for samples transferred onto SiO 2 /Si substrates reveal high average field-effect mobilities of 62 and 180 cm 2 V −1 s −1 at room temperature and 8 K, respectively. On hexagonal boron nitride substrates, these mobilities increase to 94 and 473 cm 2 V −1 s −1 , respectively. A record high saturation current density of 675 µA µm −1 is observed, outperforming the index required for high-density integration circuits in IRDS 2025. This work paves the way for the application of wide-bandgap TMDC monolayers in post-silicon electronics.
研究领域:
材料科学
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电子工程
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半导体物理
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DOI
PubMed
高影响因子
Advanced Electronic Materials
·
2024
·Vol. 10
·期 8
·2300842
·
IF 5.3
Mingyuan Sheng,Xi Chang,Xiaojun Mao,Yang Gao,Xiaoyang Xuan,Haifen Xie,Haichuan Mu,Yueping Niu,Shangqing Gong,Min Qian
The heterostructure of two-dimensional transition metal dichalcogenide (TMDC) has garnered extensive attention, for the junction is the building block of a semiconductor device. However, the controllable synthesis of TMDC heterostructures of different transition metals and different chalcogen elements is still challenging because of the etching by atom substitution during the chemical vapor deposition (CVD) process. Here, a Mo─O transition state with lower energy is introduced to the edge of an as-grown MoSe 2 by using ultraviolet ozone treatment, to prevent the fast atom substitution of S for Se, and enable a stable growth of WS 2 /MoSe 2 lateral heterostructure. A polymer-free transfer method is developed based on capillary interaction, and atomic structure characterization confirms the high-quality WS 2 /MoSe 2 lateral heterostructure. The WS 2 /MoSe 2 lateral heterostructure photodetector exhibits superior photoresponse compared to WS 2 and MoSe 2 devices, with a responsivity of 21.87 A W −1 and a detectivity of 4.2 × 10 12 Jones at 350 nm. Kelvin probe force microscopy result reveals that the built-in electric field within the heterojunction facilitates the effective separation of photogenerated electron-hole pairs. This study carries profound implications for the CVD growth and polymer-free transfer of TMDC heterostructures in photodetector applications.
研究领域:
材料科学
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半导体物理
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光电探测器技术
✓ 已验证
DOI
高影响因子
CRYSTENGCOMM
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2021
·Vol. 23
·期 25
·4451-4458
·
IF 3.545
Wenxuan Ma,Shuhua Hao,Lei Zhang,Baoyi Lv,Gang Zhao,Jinzhao Huang,Xijin Xu
CdS is widely used in the field of photocatalysis owing to its excellent photocatalytic H2 evolution (PHE) activity, but the photocatalytic stability of CdS is inhibited because of the drawback of photocorrosion. Under light, the introduction of WS2 cocatalysts induces the growth of layered CdS on the WS2 nanosheets. Through the photocatalytic activity measurement, after adding ultrathin WS2 nanosheets, the amount of H2 released can reach 139.15 mmol g−1 after 7 h, which is 11.3 times higher than that of pure CdS nanoparticles. Furthermore, these composites illustrate excellent light absorption performance in the near-infrared region. A heterojunction is formed between WS2 and CdS under light, which greatly promotes the mobility of interface carriers and limits the recombination of photogenerated carriers. The hydrogen evolution output remains stable after 42 h, and the photocorrosion problem is effectively suppressed. In this work, we provide an effective and simple method to improve photocatalytic activity and stability, which is beneficial to the practical development of photocatalysis.
研究领域:
材料科学
·
光催化
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产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
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2022
·
IF 9.794
Hengyi Chen,Minghao Hu,Peng Jing,Baocang Liu,Rui Gao,Jun Zhang
Transition metal disulfides (TMD) are considered as promising catalysts for hydrogen evolution reaction (HER) due to their unique structural and electronic properties. However, as a representative, the tungsten disulfide (WS 2 ) shows an insufficient HER performance and is still needed to be further improved. Herein, we report the synthesis of CeO 2 -modified WS 2 nanosheets with abundant heterostructures on carbon cloth (CeO 2 /WS 2 /CC) as an efficient self-supported integral electrode for HER. Experimental results and theoretical calculations imply that the intimate electronic interaction between CeO 2 and WS 2 promotes the production of more oxygen vacancies in CeO 2 to regulate the electronic structure of WS 2 , endowing extra active sites, high electron transfer efficiency, and downshifted d-band center of W, which can lead to thermoneutral hydrogen adsorption Gibbs free energies (ΔG H* ) and thus boosts HER. The optimized CeO 2 /WS 2 /CC electrode displays an improved HER performance with an overpotential of 128 mV at 10 mA cm −2 in 0.5 M H 2 SO 4 aqueous solution, 87 mV smaller than that of the WS 2 /CC electrode. Meanwhile, it also could maintain a 20 h of stable HER activity. Our work provides an effective approach to achieve various hybrid catalysts of rare earth compounds-transition metal compounds with highly active sites for superior electrocatalysis .
研究领域:
材料科学
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电化学
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DOI
高影响因子
Chinese Physics B
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2019
·Vol. 28
·期 3
·037803
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IF 1.469
Xinli Ma,Rongjie Zhang,Chunhua An,Sen Wu,Xiaodong Hu,Jing Liu
Transition metal dichalcogenides (TMDCs) belong to a subgroup of two-dimensional (2D) materials which usually possess thickness-dependent band structures and semiconducting properties. Therefore, for TMDCs to be widely used in electronic and optoelectronic applications, two critical issues need to be addressed, which are thickness-controllable fabrication and doping modulation of TMDCs. In this work, we successfully obtained monolayer WS2 and achieved its efficient doping by chemical vapor deposition and chemical doping, respectively. The n- and p-type dopings of the monolayer WS2 were achieved by drop coating electron donor and acceptor solutions of triphenylphosphine (PPh3) and gold chloride (AuCl3), respectively, on the surface, which donates and captures electrons to/from the WS2 surface through charge transfer, respectively. Both doping effects were investigated in terms of the electrical properties of the fabricated field effect transistors. After chemical doping, the calculated mobility and density of electrons/holes are around 74.6/39.5 cm2·V−1·s−1 and 1.0 × 1012/4.2 × 1011 cm−2, respectively. Moreover, we fabricated a lateral WS2 p–n homojunction consisting of non-doped n-type and p-doped p-type regions, which showed great potential for photodetection with a response time of 1.5 s and responsivity of 5.8 A/W at VG = 0 V and VD = 1 V under 532 nm light illumination.
研究领域:
材料科学
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电子工程
·
光学
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2024
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IF 8
Jie Lu,Xiang Xu,Hao-wen Zhang,Meng-lin Huang,Yang-sheng Wang,Zhe-sheng Feng,Yan Wang
As non-contact sensing, non-invasive medical diagnostics and environmental humidity monitoring technologies advance, the demand for high-performance humidity sensors is becoming increasingly apparent. Ti 3 C 2 T x MXene is an attractive humidity-sensitive candidate due to its excellent chemical activity and hydrophilic surface. However, achieving fast responsiveness and high sensitivity of dynamic changes in humidity is still challenging. Herein, this work introduced a WS 2 -modified Ti 3 C 2 T x MXene composite material as humidity sensing material with superior sensing performance. Then sodium carboxymethyl cellulose solution was added to the Ti 3 C 2 T x MXene/WS 2 composite material to adjust viscosity of the composite material, enabling the formulation of printable humidity-sensitive ink. Utilizing screen-printing technology, a mass-producible humidity sensor (CMXW2) was successfully fabricated. Experimental results show that the sensor has short response and recovery times of 4.65 s/1.33 s in the relative humidity of 11–97 % with a high humidity response of 1707 % and excellent mechanical properties. The efficacy of the humidity sensor for skin moisture monitoring, real-time respiration monitoring, and non-contact switch was also evaluated. The successful demonstration of multi-scenario applications using the CMXW2 humidity sensor opens up new possibilities and applications in the fields of smart healthcare and non-contact sensing.
研究领域:
材料科学
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生物医学工程
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智能医疗
✓ 已验证
产品关联
DOI
高影响因子
WEAR
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2023
·
IF 5
Guoqing Wang,Jingfu Song,Gai Zhao,Qingjun Ding,Tianqiang Yin,Hongxing Wang
Tungsten disulfide (WS 2 ) has great potential as solid lubricating coating on the metal surfaces due to its excellent wear resistance. In this study, a combination of experiments and machine learning (ML) was used to explore the friction process and predict the friction coefficient and wear rate of WS 2 coatings. Copper coated with WS 2 was prepared by spraying, and the tribological properties of the coating were studied under different loads, velocities, and environment temperatures using both experiments and simulations. Three ML algorithms were employed to investigate the correlations between multiple input parameters and output results. The results showed that the COF and wear rate increased with increasing load, velocity, and environment temperature, and that plastic deformation and adhesive wear were the dominant wear mechanisms under conditions of heavy load, high speed, and high temperature. The Extra Tree (ET) model effectively predicted the tribological properties of the WS 2 coating, with a COF accuracy of 0.899, while the Gradient Boosting Regression Tree (GBRT) model achieved excellent accuracy in predicting wear rate, with an accuracy of 0.948. Feature importance analysis indicated that load had the greatest effect on both COF and wear rate.
研究领域:
材料科学
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机械工程
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数据科学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Yunqi Fang,Yang Sun,Bing Guo,Hangyan Shen,Ruirui Yang
Materials with oriented structures exhibit excellent mechanical, electrical, and tribological properties. In this study, WS 2 films with a preferred orientation along the (002) plane were prepared using shear flow technology, and the influence of polyvinyl alcohol (PVA) concentration and wedge angle on the oriented structure of the WS 2 films was systematically studied. The results indicated that the diffraction peak intensity ratio of the (002) and (103) planes of the WS 2 films (I (002) /I (103) ), increased from 46.68 to 116.11 when the PVA concentration increased from 5 to 25 g/L. When the wedge angle increased from 5° to 40°, I (002) /I (103) showed a similar trend, increasing from 80.99 to 347.22. Thus, the higher I (002) /I (103) value confirmed a preferred (002) plane orientation of WS 2 in the films, indicating that an increase in PVA concentration and wedge angle significantly enhanced the shear stress of the slurry. Under shear stress, the WS 2 particles had a tendency to orient along the shear stress direction, forming a preferred (002) plane-oriented structure. Therefore, this research may provide theoretical and technical support for preparing preferred orientation 2D materials .
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Jixue Zhou,Guochen Zhao,Jinshang Li,Jie Chen,Suqing Zhang,Jin Wang,Frank C. Walsh,Shuncai Wang,Yanpeng Xue
Weak hierarchical rough structures on superhydrophobic surfaces hinder their practical industrial applications. This paper reports a strategy to fabricate robust nickel-based superhydrophobic coatings via the codeposition of nanosized WS 2 and WC particles. The Ni/WC/WS 2 composite coatings were synthesized on mild steel substrates by one-pot electroplating followed by the adsorption of stearic acid self-assembled monolayers to modify the surface wetting. The particle concentration in the bath was investigated and the maximum water contact angle of approx. 170° was achieved by optimizing the particle contained. Hardened by WC and lubricated by WS 2 inclusions the superhydrophobic coatings showed remarkable abrasive resistance with a bearing capacity ≥10,000 mm abrasion length. The coatings also showed aerophilic behavior and good environmental stability over >6 months.
研究领域:
材料科学
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Chao Yue Zhang,Zhong Wei Lu,Yu Hai Wang,Zhe Dai,Hao Zhao,Geng Zhi Sun,Wei Lan,Xiao Jun Pan,Jin Yuan Zhou,Er Qing Xie
Many heterostructures containing two types of strong polar bonds were often designed to synergistically increase the chemical confining for soluble lithium polysulfide in lithium-sulfur batteries (LSBs). To make maximum use of the two chemical interactions on confining the polysulfides, a novel structure of 2D hexagonal WS 2 -rimmed Co 9 S 8 heterostructure nanoflakes was designed on the surface of carbon nanofiber (CNF) skeletons via a simple technique. The composite nanoflakes are ~50 nm in diameter and ~5 nm in thickness, and comprised of a ~40-nm Co 9 S 8 core and a 3–4 WS 2 edge. In this design, the Co 9 S 8 core and WS 2 edge can confine the polysulfides and catalyze the electrochemical progresses at the same time. Electrochemical tests indicated that the CNF@WS 2 @Co 9 S 8 -S cathodes show a high capacity (1175 mAh g −1 at 0.1 C), an excellent rate capability (keep 77.85% at 2.0 C), and a superior cycling stability (a low decay rate of 0.061% per cycle at 2.0 C, even lower at 7.0 C and 12.0 C).
研究领域:
材料科学
·
电化学
✓ 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）