Materials Horizons
·
2017
·Vol. 4
·期 2
·274-280
·
IF 10.706
Ke Zhang,Mingzeng Peng,Wei Wu,Junmeng Guo,Guoyun Gao,Yudong Liu,Jinzong Kou,Rongmei Wen,Ying Lei,Aifang Yu,Yang Zhang,Junyi Zhai,Zhong Lin Wang
Flexible functional devices based on two dimensional (2D) materials are extremely suitable for malleable, portable and sustainable applications, such as health monitoring, electronic skin and optoelectronics. In this work, we developed a flexible photodetector based on a p-CuO/n-MoS2 heterojunction with an enhancement in photocurrent and detection sensitivity. Because of the non-centrosymmetric structure in monolayer MoS2, the piezo-potential induced by applied strain adjusts the band structure at the heterojunction interface and broadens the depletion region based on the piezo-phototronic effect. The border depletion can be discreetly used to improve the photo-generated carrier separation and transport to enhance photoresponse performance. When illuminated by a 532 nm laser, the photocurrent of the heterojunction can be enhanced 27 times under a tensile strain of 0.65% compared to strain free conditions and the detection sensitivity can reach up to 3.27 × 108 Jones. As a result, our research provides a new strategy for novel design and performance optimization of 2D material heterostructures in the application of optoelectronics.
研究领域:
材料科学
·
纳米科技
·
光电子学
·
凝聚态物理
·
功能器件
✓ 已验证
DOI
高影响因子
LANGMUIR
·
2024
·
IF 3.7
Delian Yang,Shengli Yuan,Yuqi Chen,Ying Huang,Litao Ma,Deyong He,Ming Duan,Qianhui Ou,Yong Tang,Shenwen Fang,Yan Xiong
In this work, the interaction performance of zwitterionic surfactant [dodecyl dimethyl sulfopropyl betaine (DSB-12) and hexadecyl dimethyl sulfopropyl betaine (DSB-16)] at the n-octadecane oil surface is investigated from experimental and simulation insights. For a macroscopic experiment, interfacial interferometry technology was developed for real-time monitor interaction performances and to obtain the quantitative interfacial thickness and mass results. The Langmuir model was characterized by thermodynamic analysis, deducing the aggregation spontaneity of DSB-16 > DSB-12 with ΔGagg(DSB-16) = −5.94 kJ mol–1 < ΔGagg(DSB-12) = 24.08 kJ mol–1. A three-step dynamic model (adsorption, arrangement, and aggregation) was characterized by kinetic analysis, indicating arrangement process as slow-limiting step with k2(arr) < k1(ads), k3(agg). For microscopic simulation, and molecular dynamic (MD) method was utilized to theoretically investigate interaction performances and obtain the interfacial configuration and energy results. The interaction stability and interaction strength were indicated to be DSB-16 > DSB-12 with differences of final energy ΔEfin = 48–88 kcal mol–1. The interaction mechanism was explained by proposing the model of “response enhancement” and “deposition activity” for DSB-16 interactions, and “response decrease” and “elution activity” for DSB-12 interactions. The different performances can be attributed to the different interaction forms and forces of surfactants. This work provided a platform for performance and mechanism investigation between the surfactant molecule and oil surface, which is of great significance in reservoir exploitation and enhanced oil recovery (EOR).
研究领域:
化学工程
·
石油工程
·
界面科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Wei Wang,Heng Guan,Yizhuo Fan,Jian Fang,Duo Sun,Yu Chen,Shengping Ruan
Manganese tungstate (MnWO 4 ) is a novel catalytic semiconductor metal oxide with untapped potential for acetone-sensing applications. The construction of amorphous-crystalline heterojunctions shows promising prospects for developing new high-performance gas-sensitive materials. Here, an amorphous-MoS x /crystalline-MnWO 4 composite material was constructed, and the acetone-sensing properties were explored. Due to the abundant surface hanging bonds and defects of amorphous molybdenum sulfide as gas adsorption and reaction sites, the MoS x /MnWO 4 material has a richer surface adsorption oxygen and acetone sensing properties. Combined with carrier regulation effect of the p-n heterojunction, the optimum operating temperature of the MoS x /MnWO 4 composite is reduced (120 °C) and the response towards acetone is improved, reaching a value of 10.54 (100 ppm), which is approximately 4.5 times higher than that of the pure MnWO 4 material. This work is of reference significance for the application of amorphous MoS x in the field of gas sensing and the construction of high-performance acetone sensors.
研究领域:
材料科学
·
传感技术
·
纳米技术
·
半导体物理
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2024
·
IF 8.1
Xinzhe Yan,Huyue Cao,Baolong Shi,Shuang Xiong,Yueyue Wang
By utilizing photovoltage competition between two photoelectrodes, we have successfully fabricated a photoelectrochemical (PEC) device that features switchable photocurrent polarity for wavelength-selective photodetection. Composed of distinct semiconductor materials, this device exhibits a negative photocurrent density of −1.98 μA/cm 2 under 365 nm illumination and a positive photocurrent density of 0.46 μA/cm 2 under 650 nm illumination, without requiring an external power source. The observed bidirectional photocurrent is attributed to the photovoltage competition mechanism between the photoelectrodes. Notably, the photocurrent and responsivity under 650 nm illumination are significantly enhanced following the deposition of Au nanoparticles on the MoSe 2 photoelectrode. In a three-electrode system without ZnO electrodes, the photoresponse is increased by three orders of magnitude after Au nanoparticle modification. Similarly, in a two-electrode system with ZnO electrodes, the photoresponse is enhanced by more than fifty times following Au modification. This enhancement promotes more efficient redox reactions within the device, thereby offering a novel strategy for wavelength-selective photodetection. This innovation has substantial application potential in the field of photoelectrochemistry.
研究领域:
光电化学
·
材料科学
·
纳米技术
·
半导体物理
✓ 已验证
产品关联
DOI
高影响因子
ACS Catalysis
·
2024
·
IF 11.3
Zhigao Xue,Biao Wu,Zheng Zhang,Chao Lin,Xiaopeng Li,Qiuju Zhang,Kai Tao
Creating highly effective electrocatalysts for the oxygen evolution reaction (OER) holds paramount importance in advancing carbon-neutral hydrogen production through water electrolysis. Recent research highlights the crucial role of spin effects on the OER, emphasizing that the manipulation of spin polarization is a promising strategy to augment the OER kinetics. Here, we present a core–shell heterostructure electrocatalyst, which leverages the strong coupling of the interface between antiferromagnetic Co3O4 and NiFe-layered double hydroxide (NiFe-LDH) to trigger a spontaneous magnetic response enhancement, which suggests the strong double exchange interaction at the interface of the core–shell heterostructure. This electrocatalyst displays a 26-fold increase in intrinsic OER activity compared to pristine NiFe-LDH at an overpotential of 0.25 V. Through experimental and computational analyses, we find that the strong double exchange interaction within the heterostructure creates polarized spin conduction channels at the interface, which enables efficient accumulation of electrons with appropriate spin states, thereby lowering the energy barrier for the generation of triplet O2. Our work presents a promising approach to designing high-performance OER catalysts by introducing spin selectivity in traditional metal oxide electrocatalysts.
研究领域:
电化学
·
材料科学
·
催化
·
自旋电子学
✓ 已验证
产品关联
DOI
高影响因子
Science Bulletin
·
2023
·
IF 18.9
Ziqi Zhou,Tao Shen,Pan Wang,Quanlin Guo,Qinghe Wang,Chenjun Ma,Kaiyao Xin,Kai Zhao,Yali Yu,Biao Qin,Yue-Yang Liu,Juehan Yang,Hao Hong,Kaihui Liu,Can Liu,Hui-Xiong Deng,Zhongming Wei
Polarization-sensitive photodetectors, with the ability of identifying the texture-, stress-, and roughness-induced light polarization state variation, displace unique advantages in the fields of national security, medical diagnosis, and aerospace. The utilization of in-plane anisotropic two-dimensional (2D) materials has led the polarization photodetector into a polarizer-free regime, and facilitated the miniaturization of optoelectronic device integration. However, the insufficient polarization ratio (usually less than 10) restricts the detection resolution of polarized signals. Here, we designed a sub-wavelength array (SWA) structure of 2D germanium selenium (GeSe) to further improve its anisotropic sensitivity, which boosts the polarized photocurrent ratio from 1.6 to 18. This enhancement comes from the combination of nano-scale arrays with atomic-scale lattice arrangement at the low-symmetric direction, while the polarization-sensitive photoresponse along the high-symmetric direction is strongly suppressed due to the SWA-caused depolarization effect. Our mechanism study revealed that the SWA can improve the asymmetry of charge distribution, attenuate the matrix element in zigzag direction, and the localized surface plasma, which elevates the photo absorption and photoelectric transition probability along the armchair direction, therefore accounts for the enhanced polarization sensitivity. In addition, the photodetector based on GeSe SWA exhibited a broad power range of 40 dB at a near-infrared wavelength of 808 nm and the ability of weak-light detection under 0.1 LUX of white light (two orders of magnitude smaller than pristine 2D GeSe). This work provides a feasible guideline to improve the polarization sensitivity of 2D materials , and will greatly benefit the development of polarized imaging sensors.
研究领域:
光电子学
·
纳米光子学
·
偏振成像
·
二维材料
·
光电探测器
·
半导体器件
✓ 已验证
DOI
高影响因子
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