Chemical Science
·
2023
·Vol. 14
·期 37
·10308-10317
·
IF 8.4
Zhiqiang Wang,Hao Ma,Jiaxu Zhang,Yingjia Lan,Jia-Xing Liu,Shang-Fu Yuan,Xiao-Ping Zhou,Xiaohong Li,Chaochao Qin,Dong-Sheng Li,Tao Wu
The interface microenvironment of doped quantum dots (QDs) is crucial in optimizing the properties associated with the photogenerated excitons. However, the imprecision of QDs' surface structures and compositions impedes a thorough understanding of the modulation mechanism caused by the complex interface microenvironment, particularly distinguishing the contribution of surface dopants from inner ones. Herein, we investigated interface-mediated emission using a unique model of an atomically precise chalcogenide semiconductor nanocluster containing uniform near-surface Mn2+ dopants. Significantly, we discovered that Mn2+ ions can directly transfer charges with hydrogen-bonding-bound electron-rich alkylamines with matched molecular configurations and electronic structures at the interface. This work provides a new pathway, the use of atomically precise nanoclusters, for analyzing and enhancing the interface-dependent properties of various doped QDs, including chalcogenides and perovskites.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SOLID-STATE ELECTRONICS
·
2024
·
IF 1.4
Guoxiang Song,Xinan Zhang,Haoxuan Xu
Doping is a useful technique for metal oxide thin-film transistors (TFTs) to adjust the threshold voltage and charge carrier density. However, a notable drawback is the disruption of the microstructure caused by doping crystalline lattice, leading to a partial decrease in charge carrier mobility. In this work, we suggest a surface doping technique that modifies the carrier concentration and passivates the device surface while preserving the channel layer lattice structure through the use of organic dopant molecules. It is shown that tin oxide (SnO 2 ) TFTs doped in this manner typically exhibit improved electrical characteristics, particularly greater mobility and a noticeably lower threshold voltage, without negatively affecting the devices on/off current ratio. Furthermore, compared to pristine devices, bias stress stability and long-term durability are also enhanced. These findings suggest that surface doping may find use in high-performance oxide semiconductor devices and circuits.
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
Materials Chemistry Frontiers
·
2019
·Vol. 3
·期 11
·2374-2379
·
IF 0
Tao Chen,Weifang Liu,Yi Zhuo,Hang Hu,Jing Guo,Yaochi Liu,Jun Yan,Kaiyu Liu
A facile copper surface doping process is proposed to enhance the surface structural stability of manganese-rich layered oxide cathodes. Herein, the surface structure of P2-type Na0.67Mn0.6Ni0.2Co0.2O2 was stabilized via the formation of a copper-rich surface layer. This layer can reduce the dissolution of manganese in the electrolyte and inhibit side reactions at the electrode/electrolyte interface. Expanded surface lattice channels induced by copper doping contributed to the improvement of Na+ mobility. In addition, it can be deduced from scanning transmission electron microscopy (STEM) images that copper surface doping resulted in a surface transition from the P2 phase to P3 phase. Electrochemical impedance spectroscopy (EIS) measurements confirmed that both the irreversible reaction resistance and charge transfer resistance of the copper surface-doped Na0.67Mn0.6Ni0.2Co0.2O2 (Cu-MNC) were significantly reduced. More importantly, the Cu-MNC electrode delivered an initial specific capacity of 122.2 mA h g−1 with retention of up to 83.3% after 150 cycles at 0.2C. After refreshing the sodium metal anode and electrolyte, it showed a high specific capacity of 102.4 mA h g−1 with retention of 84.14% after 200 cycles. These results open up a new method to optimize manganese-rich oxide materials for SIBs.
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
DOI
CRYSTENGCOMM
·
2022
·Vol. 24
·期 36
·6392-6399
·
IF 3.756
Yuhan Kong,Gongguo Zhang,Chunyu Wang,Yanyun Ma,Yiqun Zheng
Noble metal Janus nanocrystals involving components with the same crystal structure and close lattice constants are technically difficult to produce as anisotropic growth is not favored under general deposition conditions. Herein, taking Au and Ag, we describe a feasible synthetic strategy to create Au–Ag Janus nanoparticles (JNPs) with tunable sizes, which exhibit multiple plasmonic absorptions in the UV-vis range. The success of the current synthesis lies in the surface doping of trisoctahedral (TOH) Au seeds with limited amount of Pt/Ag atoms to introduce a relatively large lattice strain during the seeded growth, which is found crucial to facilitate the anisotropic deposition of Ag. In contrast, the use of undoped Au seeds leads to the formation of Au@Ag core–shell nanoparticles. The size of resulting products could be tuned by varying the amount of the added Ag precursor or the size/quantity of Au seeds. Compared to core–shell counterparts, the current Au–Ag Janus nanoparticles exhibit more plasmonic absorption peaks. Owing to such advantages, the current Au–Ag Janus nanoparticles show enhanced catalytic properties in the reduction of 4-nitrophenol under UV-vis light irradiation. The current study provides a feasible strategy that allows the fabrication of Janus bimetallic nanocrystals with elements having a close lattice constant and validates the promising use as plasmonic catalysts, which could be potentially extended to other metals or alloys.
研究领域:
材料科学
·
纳米技术
·
光学
✓ 已验证
DOI
高影响因子
TALANTA
·
2025
·
IF 6.1
Tingting Wang,Xinhua Zhao,Zhenxu Li,Yi Zhang,Zhu Zhang,Dachi Yang
The newly-emerged gas sensing detection of 1-octen-3-ol biomarker is expected to indirectly monitor foodborne illnesses caused by Salmonella-contaminated meat, which requires high selectivity and a ppb-concentration detection limit. Here, surface-doped ruthenium over tungsten oxide nanocubes (Ru/WO 3 NCBs) have been synthesized by a wet-chemical approach for highly selective and ppb-concentration 1-octen-3-ol sensing. As-prepared Ru/WO 3 NCBs exhibit a polycrystalline structure and consist of NCBs that have an average side length of ∼131 nm, and the Ru/WO 3 NCBs show a high sensing response toward 5 ppm 1-octen-3-ol (R a /R g = 406), excellent selectivity, 50 ppb detection limit, 70% relative humidity tolerance, and 54 days stability at 220 o C. The excellent sensing performance might be attributed to the electronic and chemical sensitization of Ru, which thickens the electron depletion layer and increases adsorbed oxygen to promote interfacial electron transfer and 1-octen-3-ol oxidation. Practically, Ru/WO 3 NCBs have been integrated into a sensing device to simulate detecting 1-octen-3-ol, which has the potential for Salmonella detection in the future.
研究领域:
生物传感
·
食品安全
·
纳米材料
·
环境监测
·
分子诊断
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Surfaces and Interfaces
·
2024
·
IF 5.7
Ping Lu,Zixing Gu,Zihan Zhang,Huaneng Su,Qiang Ma,Chunsheng Li,Lei Wei,Qian Xu
The all-in-one E-fueled solar flow battery system that can be recharged with liquid fuel is a new type of power system. It can continuously convert solar energy into liquid fuel without relying on external power supply equipments. However, the interface between the photoanode and the electrolyte often exhibits unsteady behavior, resulting in poor performance of the system. In this work, the {201} facets are selected and the impact of two doping treatment strategies for TiO 2 {201} photoanode on the performance of the E-fueled solar flow battery system is systematically studied through the I-t curve, linear sweep voltammetry, Mott-Schottky plot. The results show that the un-biased photocharging current of bulk-doped TiO 2 can reach 2.7 mA·cm −2 in the battery system test, only relying on the self-built electric field at the interface, and the energy conversion efficiency approaches 2.67 %. In addition, the performance is analyzed by the combination of transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy and other characterizations, with the aim of distinguishing the effects of bulk- and surface-doped Mn and accurately revealing the mechanism of their influences from the outside to the inside. Finally, the optimization rules of the un-biased light charging mode of the system are explored.
研究领域:
材料科学
·
电化学
·
太阳能转化
·
电池技术
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2022
·Vol. 33
·期 5
·2208055
·
IF 19.924
Yizhe Guo,Fan Wu,Guan-Hua Dun,Tianrui Cui,Yanming Liu,Xichao Tan,Yancong Qiao,Mario Lanza,He Tian,Yi Yang,Tian-Ling Ren
Biological synapses are the operational connection of the neurons for signal transmission in neuromorphic networks and hardware implementation combined with electrospun 1D nanofibers have realized its functionality for complicated computing tasks in basic three-terminal field-effect transistors with gate-controlled channel conductance. However, it still lacks the fundamental understanding that how the technological parameters influence the signal intensity of the information processing in the neural systems for the nanofiber-based synaptic transistors. Here, by tuning the electrospinning parameters and introducing the channel surface doping, an electrospun ZnO nanofiber-based transistor with tunable plasticity is presented to emulate the changing synaptic functions. The underlying mechanism of influence of carrier concentration and mobility on the device's electrical and synaptic performance is revealed as well. Short-term plasticity behaviors including paired-pulse facilitation, spike duration-dependent plasticity, and dynamic filtering are tuned in this fiber-based device. Furthermore, Perovskite-doped devices with ultralow energy consumption down to ≈0.2554 fJ and their handwritten recognition application show the great potential of synaptic transistors based on a 1D nanostructure active layer for building next-generation neuromorphic networks.
研究领域:
材料科学
·
纳米技术
·
神经形态工程
·
电子器件
✓ 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）