NANOTECHNOLOGY
·
2023
·Vol. 34
·期 19
·195201
·
IF 3.5
Xiufeng Song,Yuxuan Jian,Xusheng Wang,Jiawei Chen,Qingsong Shan,Shengli Zhang,Zhanyang Chen,Xiang Chen,Haibo Zeng
Perovskites have showed significant potential for the application in photodetectors due to their outstanding electrical and optical properties. Integrating two-dimensional (2D) materials with perovskites can make full use of the high carrier mobility of 2D materials and strong light absorption of perovskite to realize excellent optoelectrical properties. Here, we demonstrate a photodetector based on the WTe2/CsPbI3 heterostructure. The quenching and the shortened lifetime of photoluminescence (PL) for CsPbI3 perovskite confirms the efficient charge transfer at the WTe2/CsPbI3 heterojunction. After coupled with WTe2, the photoresponsivity of the CsPbI3 photodetector is improved by almost two orders of magnitude due to the high-gain photogating effect. The WTe2/CsPbI3 heterojunction photodetector reveals a large responsivity of 1157 A W−1 and a high detectivity of 2.1 × 1013 Jones. The results pave the way for the development of high-performance optoelectronic devices based on 2D materials/perovskite heterojunctions.
研究领域:
材料科学
·
光电子学
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DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2021
·Vol. 31
·期 13
·2008116
·
IF 18.808
Li Yang,Hao Wu,Liang Zhang,Wenfeng Zhang,Luying Li,Tappei Kawakami,Katsuaki Sugawara,Takafumi Sato,Gaojie Zhang,Pengfei Gao,Younis Muhammad,Xiaokun Wen,Boran Tao,Fei Guo,Haixin Chang
The discovery of type-II Weyl semimetal states in layered transition metal dichalcogenides Td-WTe 2 indicates great potential for novel electronic, spintronic, and quantum devices. Theoretically, the interaction between the topological states and the magnetic ordered states of Td-WTe 2 enables the modulation of Weyl semimetal states by an external magnetic field. However, currently, ferromagnetism in layered Td-WTe 2 is still elusive and rarely observed. In this research, ferromagnetic order into WTe 2 using magnetic chromium (Cr) doping with a two-step Te flux strategy is introduced. The Curie temperature ( T c ) and the ferromagnetic moment are well tuned with a Cr doping concentration. The T c of the Cr-doped layered Td-WTe 2 could be regulated from 182 to 283 K, which is close to room temperature. The saturation magnetic moment could be changed from 2.26 to 4.20 emu g –1 , which is stronger than most values reported for these materials. Most intriguingly, the Cr-doped layered Td-WTe 2 single crystals still exhibit semimetallic behavior and they possess very large magnetoresistance with obvious Shubnikov de Haas (SdH) quantum oscillations and an anomalous Hall effect. The findings offer feasible ways to induce and tune ferromagnetic orders in layered Td-WTe 2 and thus to control its topological phase with external magnetic fields.
研究领域:
凝聚态物理
·
材料科学
·
自旋电子学
·
量子材料
·
拓扑物态
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Ziheng Wei,Yongping Liu,Qi Ding,Yuena Zhang,Yu Ren,Jihu Chen,Mingming Si,Yuchi Fan,Wan Jiang
Conductive two-dimensional (2D) materials exhibit excellent electromagnetic wave (EMW) absorption properties at high frequencies due to their high conductivity loss. However, their unsatisfactory EMW absorption at low frequencies, attributed to impedance mismatch, remains a significant challenge. In this work, high-conductivity 1T′ WTe 2 nanosheets were incorporated into insulating mesoporous channels of Santa Barbara Amorphous-15 (SBA-15) via chemical vapor deposition (CVD), resulting in the formation of 1T′ WTe 2 /SBA-15 composites. These mesoporous channels restrict the growth of 1T′ WTe 2 and hinder carrier migration cross the channels, reducing their conductivity. Meanwhile, heterogeneous interfaces were formed between 1T′ WTe 2 nanosheets and mesoporous channels of SBA-15, accompanied by defects within the 1T′ WTe 2 nanosheets. This interaction promotes dipole polarization losses, significantly enhancing the attenuation of incident EMW, particularly at low frequencies. Consequently, the effective absorption bandwidth (EAB) of 1T’ WTe 2 /SBA-15 composites within the S band reached to 0.72 GHz, ranging from 3.28 GHz to 4.0 GHz, with a minimum reflection loss (RL min ) of −26.5 dB at 3.68 GHz. Furthermore, the EAB of the composites extended to 3.92 GHz at 1.5 mm in the high-frequency range. This work introduces a novel strategy for enhancing EMW absorption performance in the S band through heterogeneous interfaces and defect engineering, driven by the limiting effects of mesoporous channels.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2025
·Vol. 15
·期 10
·762
·
IF 4.3
Mingkun Zheng,Wancheng Zhang,You Lv,Yong Liu,Rui Xiong,Zhenhua Zhang,Zhihong Lu
The low-symmetry Weyl semimetallic Td-phase WTe2exhibits both a distinct out-of-plane damping torque (τDL) and exceptional charge–spin interconversion efficiency enabled by strong spin-orbit coupling, positioning it as a prime candidate for spin–orbit torque (SOT) applications in two-dimensional transition metal dichalcogenides. Herein, we report on thickness-dependent unconventional out-of-planeτDLin chemically vapor-deposited (CVD) polycrystalline Td-WTe2(t)/Ni80Fe20/MgO/Ti (Td-WTN-t) heterostructures. Angle-resolved spin-torque ferromagnetic resonance measurements on the Td-WTN-12 structure showed significant spin Hall conductivities ofσSH,y= 4.93 × 103(ℏ/2e) Ω−1m−1andσSH,z= 0.81 × 103(ℏ/2e) Ω−1m−1, highlighting its potential for wafer-scale spin–orbit torque device applications. Additionally, a detailed examination of magnetotransport properties in polycrystalline few-layer Td-WTe2films as a function of thickness revealed a marked amplification of the out-of-plane magnetoresistance, which can be ascribed to the anisotropic nature of charge carrier scattering mechanisms within the material. Spin pumping measurements in Td-WTN-theterostructures further revealed thickness-dependent spin transport properties of Td-WTe2, with damping analysis yielding an out-of-plane spin diffusion length ofλSD≈ 14 nm.
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产品关联
DOI
PubMed
高影响因子
Journal of Energy Chemistry
·
2024
·
IF 14
Xiaoyue Zhang,Yong Yang,Yingjie Hu,Lijun Xiong,Tianyu Wang,Panjie Li,Jinyou Shen
Photothermal catalytic CO 2 conversion provides an effective solution targeting carbon neutrality by synergistic utilization of photon and heat. However, the C–C coupling initiated by photothermal catalysis is still a big challenge. Herein, a three-dimensional (3D) hierarchical W 18 O 49 /WTe 2 hollow nanosphere is constructed through in-situ embodying of oxygen vacancy and tellurium on the scaffold of WO 3 . The light absorption towards near-infrared spectral region and CO 2 adsorption are enhanced by the formation of half-metal WTe 2 and the unique hierarchical hollow architecture. Combining with the generation of oxygen vacancy with strengthened CO 2 capture, the photothermal effect on the samples can be sufficiently exploited for activating the CO 2 molecules. In particular, the close contact between W 18 O 49 and WTe 2 largely promotes the photoinduced charge separation and mass transfer, and thus the *CHO intermediate formation and fixedness are facilitated. As a result, the C–C coupling can be evoked between tungsten and tellurium atoms on WTe 2 . The ethylene production by optimized W 18 O 49 /WTe 2 reaches 147.6 μmol g − 1 with the selectivity of 80%. The in-situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) and density functional theory (DFT) calculations are performed to unveil the presence and significance of aldehyde intermediate groups in C–C coupling. The half-metallic WTe 2 cocatalyst proposes a new approach for efficient CO 2 conversion with solar energy, and may especially create a new platform for the generation of multi-carbon products.
研究领域:
材料科学
·
催化
·
化学工程
·
环境科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Physical Chemistry C
·
2021
·
IF 4.126
Luji Li,Gaojie Zhang,Hao Wu,Li Yang,Pengfei Gao,Shanfei Zhang,Xiaokun Wen,Wenfeng Zhang,Haixin Chang
Weyl semimetals haveattracted extensive research interests due to their unique topological properties. However, photoelectric devices based on pristine semimetals with large electrical conductivity are hard to detect especially under weak light. Here, with the help of MoS2, a stable van der Waals semiconductor, WTe2/MoS2 van der Waals heterojunctions are designed to successfully realize stable photoresponse from visible light to near-infrared. Tunable photocurrent is observed compared to pristine MoS2 with faster response under the effect of semimetal WTe2. Our study illustrates the great potential of WTe2 and other topological semimetals in photodetectors.
✓ 已验证
DOI
高影响因子
Nanomaterials
·
2024
·Vol. 14
·期 2
·226
·
IF 4.4
Xinhao Zhang,Shuo Chen,Heqi Ma,Tianyu Sun,Xiangyong Cui,Panpan Huo,Baoyuan Man,Cheng Yang
Field-effect transistor (FET) biosensors can be used to measure the charge information carried by biomolecules. However, insurmountable hysteresis in the long-term and large-range transfer characteristic curve exists and affects the measurements. Noise signal, caused by the interference coefficient of external factors, may destroy the quantitative analysis of trace targets in complex biological systems. In this report, a “rectified signal” in the output characteristic curve, instead of the “absolute value signal” in the transfer characteristic curve, is obtained and analyzed to solve these problems. The proposed asymmetric Schottky barrier-generated MoS2/WTe2FET biosensor achieved a 105rectified signal, sufficient reliability and stability (maintained for 60 days), ultra-sensitive detection (10 aM) of the Down syndrome-related DYRK1A gene, and excellent specificity in base recognition. This biosensor with a response range of 10 aM–100 pM has significant application potential in the screening and rapid diagnosis of Down syndrome.Keywords:Schottky junction;field-effect transistor;biosensor;rectified signal;ultra-sensitive detection
研究领域:
材料科学
·
生物医学工程
·
基因检测
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Small
·
2025
·Vol. 21
·期 33
·2500838
·
IF 12.1
Hang Wang,Tianyu Wang,Yongjia Zheng,Shanhe Xue,Abid,Yige Zheng,Qingyun Lin,Afzal Khan,Qi Zhang,Rong Xiang
The recent development of 1D van der Waals (vdW) crystals enables the exploration of new physics and new designs in photonic and electronic devices. However, because of the large variation in the material library, synthesizing and understanding these 1D vdW crystals are still in an early stage compared to their 2D counterparts. Here, a chemical vapor transport (CVT) synthesis route is proposed to produce 1D WTe 2 vdW crystals with controlled small diameters ranging from 2 to 20 nm. These 1D crystals exhibit high crystallinity, high phase purity and strong anisotropic optical responses. We also systematically studied the stability of these materials in the ambient environment and observed that 1D WTe 2 vdW crystals undergo rapid oxidation within 10 min. The ambient-generated oxide layer on a 1D WTe 2 formed a natural WTe 2 /O-WTe 2 heterojunction, which gave rise to a negative photoconductive effect, resulting in two different transport properties in the temperature range of 40–300K. These findings shed light on the suppression of photoexcitation conductivity and offered a framework for studying other 1D vdW materials, particularly these interesting but less explored Te-group crystals.
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产品关联
DOI
PubMed
高影响因子
Advanced Optical Materials
·
2024
·Vol. 12
·期 25
·2400776
·
IF 8
Yu Yu,Zhiyuan Dai,Haibiao Guan,Ruowen Wang,Tao Ye,Yonghao Bu,Jie Deng,Mengdie Shi,Liaoxin Sun,Rui Xin,Tianxin Li,Haibo Shu,Xiaoshuang Chen,Jing Zhou
Blackbody-sensitive uncooled infrared photodetectors with ultra-broadband and ultrafast photoresponse have a profound impact on many areas of modern science and technology. However, it is a big challenge for both traditional photodetectors and emerging low-dimensional ones to simultaneously have all the above characteristics. Here, this challenge is addressed by establishing a Te/WTe 2 heterostructure photodetector. The built-in field of the heterostructure and the crossing conduction and valence bands of WTe 2 jointly result in a high responsivity and a visible-to-long-wavelength-infrared photoresponse range. The peak responsivity (at the 3.3 µm wavelength) reaches 914 mA W −1 at zero bias and 8.51 A W −1 at 2 V bias. Further, the joint action coupled with the high mobility of Te and WTe 2 promotes the 3-dB bandwidth to 153 kHz. The self-powered blackbody responsivity and specific detectivity reach 235.7 mA W −1 and 1.1 × 10 8 cm Hz 1/2 W −1 , respectively. The former increases to 5.82 A W −1 at 1 V bias. Moreover, this device is polarization-sensitive with a contrast ratio of 2. This work reveals the potential of the Te/WTe 2 heterostructure for high-performance room-temperature infrared photodetectors.
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DOI
高影响因子
Journal of Materials Chemistry A
·
2023
·Vol. 12
·期 2
·923-931
·
IF 11.9
Xiaoyue Zhang,Chaoran Dong,Yong Yang,Yingjie Hu,Lizhi Wu,Yu Gu,Kan Zhang,Jinyou Shen
It is of significance to convert CO2 into value-added carbon compounds under solar light. Here, we report a WTe2 photothermal catalyst for the highly selective conversion of CO2 into a commercially valuable chemical, ethylene (C2H4), by using the dual sites of W and Te under light illumination. It is found that (1) WTe2 offers favorable formation of a *CHO intermediate at the W site, a lower energy barrier for the transfer of the *CHO intermediate from the W to the Te site, and a suitable W–Te distance for the C–C coupling to produce C2H4; (2) the photocatalysis and thermocatalysis synergistically cooperate with each other on WTe2, significantly facilitating the CO2 conversion. As a result, by designing a WTe2 nanostructure with an enhanced photothermal effect, the reaction temperature can reach 185 °C under a 300 W Xe lamp, enabling a C2H4 production rate of 115.51 μmol g−1 with a selectivity of C2H4 up to 88%, which exceeds all reported values of solar-driven C2H4 production.
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产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2022
·
IF 6.14
Wanying Lin,Biao Zhang,Jun Jiang,Enzuo Liu,Junwei Sha,Liying Ma
The design of transition metal dichalcogenides that satisfies the essential requirements of the hydrogen evolution reaction (HER) in alkaline solutions remains a challenge. The study gives a description of sulfur atoms into both anionic and cationic sites of WTe2, which is deliberately designed and has been rarely reported. Herein, we report 3D self-supported anionic and cationic S-substituted WTe2 nanosheet arrays constructed on a carbon cloth by a three-step synthesis method at elevated temperatures. Experimental and theoretical analysis are both executed to investigate S-WTe2/CC nanocomposites for efficient alkaline HER, and the results attest to its excellent electrocatalytic performance. The optimized S-WTe2/CC exhibits an enhanced HER activity with an overpotential of 195 mV at the current density of 10 mA cm–2, which is 2.3 and 1.7 times lower than that of WO3/CC (451 mV) and WTe2/CC (327 mV), respectively. According to density functional theory calculations, such improvement of alkaline HER is attributed to the optimized p-band electron configuration of Te atoms, higher H* intermediate adsorption, and lower H2O dissociation energy barrier by anionic and cationic co-substitution of S, which accelerate the Volmer–Heyrovsky process. The present study paves a way to the modification strategy of WTe2 electrocatalysts.
研究领域:
材料科学
·
电化学
·
理论计算
✓ 已验证
产品关联
DOI
高影响因子
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