Nanomanufacturing and Metrology
·
2024
·Vol. 7
·期 1
·1-16
·
IF 0
Wang Tao,Tian Yanling,Lu Zhilai,Wang Weijie,Zhang Zhao,Zhu Guangwei,Tang Hui,Zhang Dawei
As a promising micro/nanofabrication method, electrical-assisted nanomachining has obtained substantial attention due to its high material removal rate and attainable superior surface quality. In this study, a rectangular wave electrical signal was applied for nanomachining by a customized tungsten tip. Owing to the coupling effect between the electric field and mechanical force, the cutting depth of the machined grooves can be expanded. In electrical-assisted groove processing, a depth of 270 nm and an aspect ratio of 0.6 on the copper sample can be achieved. The influence of operation parameters including applied voltage, frequency, duty ratio, normal force and cutting speed on the machining performance was investigated in terms of the groove depth, width, aspect ratio, and surface roughness. The potential machining mechanisms should be a combination of electric field force, nanoscale electric discharge, electric contact thermal effects, possible annealing behavior, and scraping and plowing actions induced by mechanical forces.
研究领域:
纳米制造
·
精密工程
·
材料科学
·
机电加工
✓ 已验证
DOI
Advanced Materials Technologies
·
2022
·Vol. 8
·期 5
·2201682
·
IF 8.856
Yulu Cai,Biao Yang,Junpeng Ji,Fuchang Sun,Yiqian Zhao,Lirong Yu,Changbin Zhao,Manyu Liu,Mingqiang Liu,Yaowu He,Chaohong Zhang,Hong Meng
With the development of modern technology, the functions of smart windows are expected to be more abundant apart from reducing energy consumption. A viable and popular solution is to develop a versatile product. Here a multi-functional tandem device enabled by ionic gels to form a smart glass that can be applied in manifold scenarios, is reported. The ionic gels successfully fulfill the multiple tasks of simultaneously being electrolytes, ion storage medium, as well as transparent electrodes, and help heighten the overall transparency of the devices. The novel tandem configuration simply consists of five stacking functional layers and is universal for DC-driven electrochromic and AC-driven electroluminescent sub-devices. The newly-developed devices demonstrate magnificent characteristics of high and tunable transparency (0–77%), selective infrared shielding ability, diversified displaying and decoration, excellent stability (3000 cycles), and even flexibility. Multifarious application scenarios of the structure in diversified device forms are proposed and presented. The proposed device architecture provides a facile methodology to fabricate functional devices and will provoke infinite novel ideas for developing the next-generation smart windows.
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2023
·
IF 22.1
Wanli Liang,Mengyan Zhou,Xinyi Lin,Jinchang Xu,Pengyu Dong,Zhichen Le,Muzi Yang,Jian Chen,Fangyan Xie,Nan Wang,Yanshuo Jin,Hui Meng
Hydrogen is considered as an efficient energy alternative, and the use of offshore wind power to electrolyze seawater to produce hydrogen will become the future model. Here, nickel-doped tungsten oxide is proposed to realize hydrogen production from seawater. Ni-WO x @NF was prepared experimentally, in which Ni was doped into WO x to replace part of the W sites. There is a volcanic relationship between the amount of Ni doping and the activity of the hydrogen evolution reaction. Particularly in alkaline seawater, Ni-WO x @NF only needs an overpotential of 45.69 mV to reach a current density of 10 mA cm −2 and exhibits stability over 120 h. In addition, theoretical calculations confirmed that Ni doping can optimize the activity of hydrogen evolution reaction. This work proposes that nickel doping can enhance the hydrogen evolution reaction activity of tungsten oxide with excellent corrosion resistance, enabling it to work efficiently and stably in alkaline seawater.
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2023
·Vol. 19
·期 14
·2206933
·
IF 13.3
Nanyang Wang,Liping Ding,Taotao Li,Kai Zhang,Liyun Wu,Zhengyang Zhou,Qian He,Xuhua He,Xuebin Wang,Yue Hu,Feng Ding,Jin Zhang,Yagang Yao
The large-scale synthesis of high-quality boron nitride nanotubes (BNNTs) has attracted considerable interests due to their applications in nanocomposites, thermal management, and so on. Despite decades of development, efficient preparation of high-quality BNNTs, which relies on the effective design of precursors and catalysts and deep insights into the catalytic mechanisms, is still urgently needed. Here, a self-catalytic process is designed to grow high-quality BNNTs using ternary W–B–Li compounds. W–B–Li compounds provide boron source and catalyst for BNNTs growth. High-quality BNNTs are successfully obtained via this approach. Density functional theory-based molecular dynamics (DFT-MD) simulations demonstrate that the Li intercalation into the lattice of W 2 B 5 promotes the formation of W–B–Li liquid and facilitates the compound evaporation for efficient BNNTs growth. This work demonstrates a high-efficient self-catalytic growth of high-quality BNNTs via ternary W–B–Li compounds, providing a new understanding of high-quality BNNTs growth.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Solar RRL
·
2022
·Vol. 6
·期 8
·2200150
·
IF 9.173
Chengfeng Ma,Chunxu Xiang,Xinge Liu,Bingyan Li,Xinyu Li,Shuaiqi Han,Qi Dai,Weibo Yan,Hao Xin
Solution-processed chalcopyrite copper indium gallium sulfoselenide (Cu(In,Ga)(S,Se) 2 , CIGSSe) thin-film solar cells have achieved efficiency beyond 18% and have great potential as an alternative to vacuum-based ones. However, most of the efficient solution-based CIGSSe solar cells are fabricated by spin-coating in an inert atmosphere, which limits the transfer from lab protocol to industrial large-scale production. Herein, a scalable doctor-blading technique is applied to fabricate CuIn(S,Se) 2 (CISSe) absorbers from N,N-dimethylformamide molecular precursor solution in ambient air. With the optimization of the precursor concentration to reduce the residue solvent and change the thermal annealing process from one-step to two-step to separate solvent evaporation and complex decomposition to suppress fluidity, high-quality absorber films with densely packed large grains have been fabricated and a champion CISSe solar cell with a power conversion efficiency of 12.54% has been achieved. Importantly, unlike the spin-coating technique which may cause composition change due to the different solubilities of the precursors, the doctor-bladed film has a composition very close to the precursor solution, which is very important for precise control of the absorber composition for industrial production.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Linwei Jiang,Yichen Pan,Jiancheng Zhang,Xin Chen,Xinwen Ye,Zhendong Li,Caicai Li,Qingfeng Sun
Replacing the sluggish oxygen evolution reaction (OER) with thermodynamically favorable urea oxidation reaction (UOR) is an appealing tactic in the energy-saving water splitting system. Herein, by a facile composite electrodeposition method, an electrocatalyst with Mo particles anchored on the Ni-P matrix (Mo/Ni-P) was fabricated and utilized for urea-assisted water electrolysis of hydrogen production. As expected, the urea-involved electrolytic cell with the as-obtained Mo/Ni-P served as both the anode and cathode merely needs a voltage of 1.55 V to sustain a current density of 50 mA cm −2 (0.16 V less than that of the conventional water splitting at 50 mA cm −2 ) and can maintain the stability for 12 h. Additionally, the solar-driven urea-assisted water electrolysis system was constructed under lab conditions and solar-hydrogen-electricity energy conversion processes were also simulated. Moreover, it was demonstrated that tungsten (W) particles can also serve as an accelerant for promotion both the hydrogen evolution reaction (HER) and UOR activity of pristine Ni-P. This work will present a facile method for rational integration of metal particles with Ni-P layer for highly efficient electrocatalysts applied in economic production of H 2 .
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nanoscale
·
2022
·Vol. 14
·期 13
·5002-5009
·
IF 8.307
Tiantian Dai,Zanhong Deng,Shimao Wang,Xiaodong Fang,Gang Meng
With features of innate tunnels and oxygen vacancies derived from a unique geometrical structure and sub-stoichiometric compositions, W18O49 nanowires have been explored as multifunctional materials with diverse applications. Though thermal oxidation offers a facile method to synthesize patterned W18O49 nanowires, the relatively high growth temperature (≳500 °C) hinders their emerging applications in flexible or wearable electronics. In this work, aiming to lower the growth temperature of W18O49 nanowires by thermal oxidation, the temperature and oxygen partial pressure dependent growth has been systematically investigated for both W films and powders. W18O49 nanowires could be steadily obtained with appropriate temperature and oxygen pressure ranges for both cases, while the growth temperature of a W film (metastable β phase dominant) could be much lower than that of W powder (α phase). The structural analysis indicates that metastable β-W is susceptible to oxidation in comparison with α-W and thus generates oxidation-induced chemical compression for nanowire growth. The growth temperature of W18O49 nanowires could be reduced to ca. 400 °C, which paves the way for the in situ patterning of W18O49 nanowires on indium-tin-oxide (ITO) glass substrates and flexible substrates.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Zhihuan Wei,Xiao Ma,Haonan Zhao,Xiaozhong Wu,Qinglei Guo
Biodegradable conductive composites are key materials or components for printable transient electronics that can be fabricated in a low-cost and high-efficiency manner, thereby boosting their wide applications in biomedical engineering, hardware security, and environmental-friendly electronics. Continuous efforts in this area still lie in the development of strategies for highly conductive, safe, and reliable biodegradable conductive composite materials and devices. This paper introduces molybdenum/wax composites for multimodally printable transient electronics in which multiple transience modes including dissolution-induced degradation and thermally triggered degradation are available. Systematic experiments demonstrate several advantages and unique properties of this material system, including solvent-free fabrication, self-sintering behavior, and long-term and high conductivity via accelerable self-sintering treatment and rehealing capabilities. Notably, the immersion of molybdenum/wax composites in phosphate buffer solution can provide both positive effects (accelerated self-sintering-dominated) and negative effects (degradation-dominated) on their electrical conductivities. Mechanism analyses reveal the basis for balancing the degradation and accelerated self-sintering processes. The presented demonstrations foreshadow opportunities of the developed molybdenum/wax composites in rehealable electronics, on-demand smart transient electronics with multiple transience modes, and many other related unusual applications.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Zhilei Wei,Siyu Liu,Dangui Liu,Jinling Wu,Hongyan Xia,Bo Wang,Zhongqi Shi
Si 3 N 4 ceramics have shown promising application prospects as the sealing materials for liquid metal batteries (LMBs). However, the joining of Si 3 N 4 to the metal shell of LMBs is rather difficult because of the non-wetting property and mismatch of their thermal expansion coefficients (CTEs). Herein, to solve the above issue, W/Si 3 N 4 functionally graded materials (FGMs) were designed and fabricated via the spark plasma sintering (SPS) process. The effects of layer numbers and layer components on the phase composition, structure, and thermal stress of the FGMs were systematically investigated using both experimental and simulation methods. W/Si 3 N 4 FGMs, with optimal layer numbers, were then utilized for fabricating symmetrical W/Si 3 N 4 /W FGMs. The thermal stress of the products can be effectively reduced by adjusting the MgO content of the central Si 3 N 4 layer. As a result, the optimal product displayed good interface bonding between two adjacent layers and also exhibited high flexural strength (943.9 MPa) and electrical resistivity (2.0 × 10 12 Ω cm). This route for the fabrication of symmetrical W/Si 3 N 4 /W FGMs exhibits the advantage of high efficiency, and the products with excellent properties can be used as sealing materials for LMBs.
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
·
2021
·
IF 3.871
Wenqiang Wang,Fang Peng,Hao Liang,Shixue Guan,Wenjia Liang,Lu Zhang,Mengyang Huang,Yue Tang,Duanwei He
As a highly controversial candidate superhard material, tungsten tetraboride (WB 4 ) has attracted widespread attention due to its desirable mechanical properties . Here, single phase WB 4 ceramics and WB 4 -based materials containing tantalum (Ta) have been successfully synthesized by a high-pressure reaction at 5.0 GPa and 1400 °C - 3000 °C. We systematically investigated the effect of processing temperature on the phase stability of WB 4 and doping with different amounts of Ta on mechanical properties and thermal stability. The results confirm that increasing treatment temperature is beneficial to the synthesis of the WB 4 phase, and high pressure can effectively inhibit the decomposition of WB 4 . Additionally, the hardness value of the WB 4 -based ceramic is found to decrease with the increase of the doped tantalum content. However, the hardness of WB 4 is less than W 0.9 Ta 0.1 B 4 (10 at. % Ta), indicating that a small amount of Ta doping is positive for the mechanical properties of WB 4 . The results show that the W 0.9 Ta 0.1 B 4 ceramic synthesized at a temperature of 2800 °C and 5.0 GPa has excellent overall properties. Its Vickers hardness is 42 GPa (0.49 N), and its oxidation resistance temperature is 542 °C, which is much higher than the hardness and thermal stability of tungsten carbide (WC). This work can provide practical guide for the design of new transition metal boride superhard materials, and point out the visual direction for exploring the next generation of superhard materials.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2022
·Vol. 51
·期 2
·486-494
·
IF 2.047
Wang Xiaochun,Zhou Zhiwei,Lin Xuesong
In this work, we introduced two-dimensional (2D) WSe 2 with the lowest heat conductivity to enhance thermoelectric properties of the non-toxic and cost-effective SnTe. On one hand, the improved power factor can be attributed to the enhancement of Seebeck coefficient due to the decrease of low-energy carriers and minority carriers by the addition of WSe 2 -SnTe p - p -type heterojunction interface barriers. On the other hand, the thermal conductivity also decreased sharply by the heightened phonon scattering from the high-density stacking faults and multiscale hierarchical architectures. Ultimately, benefiting from the dual regulation effect of the introduction of 2D WSe 2 on the electro-acoustic decoupling, an improved figure of merit ( ZT ) of 1.0 is achieved for the composition of SnTe + 6 wt% WSe 2 at 873 K, which is enhanced by 134% in comparison with the pure SnTe sample. Moreover, the meaningful attempt represents an effective and feasible strategy for mixing SnTe with other compounds by the method of ball milling. Graphical Abstract
✓ 已验证
产品关联
DOI
高影响因子
Catalysts
·
2021
·Vol. 11
·期 11
·1265
·
IF 4.146
Yanli Chen,Yanping Ye,Qiang Tao,Lihua Yang,Jiaen Cheng,Xiaoyan Liu,Jian Cao,Hougang Fan,Maobin Wei,Pinwen Zhu,Lili Yang,Jinghai Yang
The forms of boron atoms are many and varied in the structure of transition metal borides (TMBs). The form of boron atoms determines the structure, morphology, and properties of borides. Herein, transition metal monoborides (CrB and WB) with different arrangement of one-dimensional (1D) boron chains were synthesized under high pressures and high temperatures. The 1D boron chains between the interlayers of CrB are parallel to one another, while the 1D boron chains between the interlayers of WB are perpendicular to one another. The morphologies of CrB and WB also show large differences due to the difference in 1D boron chain arrangement. As electrocatalysts for hydrogen evolution reactions (HERs), CrB and WB show good catalysis activity and durability. WB has the smallest overpotential (210 mV) and Tafel slope (90.09 mV dec−1), which is mainly attributed to the intercrossing boron chains improving the electrical properties of WB, as well as the 5d electrons of W being more chemically active. The TOF value of WB is 1.35 s−1, proving that WB has a higher intrinsic catalytic activity during HERs. This work provides a data reference for the development of high-efficiency electrocatalysts.Keywords:transition metal monoborides;1D boron chains;high pressure and high temperature;electrocatalyst;hydrogen evolution reaction;periodic bond chain theory
✓ 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）