APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Jing Li,Lixin Chen,Zhe Hua,Baodan Liu
Gallium-zinc oxynitride solid solution has been considered as a promising candidate material for photoelectrochemical (PEC) water splitting. However, its PEC performance is severely limited by the poor charge separation efficiency and the adverse intrinsic vacancy defects . Herein, to solve these problems, we developed a novel strategy for constructing dendritic (GaN) 1-x (ZnO) x /GaN arrays with type-Ⅱ heterojunction on a conductive GaN crystalline substrate by an Au-assisted chemical vapor deposition method. Then, an additional annealing treatment in Ar is carried out to further decrease the density of surface oxygen vacancy and to increase the density of O N -V Ga vacancy complexes for enhancing photoelectrochemical performance. Under the synergistic effect of type-Ⅱ heterojunction and vacancy modulation, the optimized (GaN) 1-x (ZnO) x /GaN photoanode exhibits a photocurrent density of 0.25 mA cm −2 at 1.23 V vs. RHE and the surface modification with CoPi co-catalyst can further increase the photocurrent density to 0.45 mA cm −2 at 1.23 V vs. RHE. It is demonstrated that the O N -V Ga vacancy complexes are beneficial to increase the PEC performance of gallium zinc oxynitrides.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
Nature Communications
·
2025
·Vol. 16
·期 1
·1-11
·
IF 15.7
Wang Zhouzhou,Ye Haotian,Li Yixin,Sheng Bowen,Wang Ping,Ou Pengfei,Li Xiao-Yan,Yu Tianqi,Huang Zijian,Li Jinglin,Yu Ying,Wang Xinqiang,Huang Zhen,Zhou Baowen
Light-driven bioethanol dehydration offers attractive outlooks for the sustainable production of ethylene. Herein, a surface-hydrogenated CrMnO x is coupled with GaN nanowires (GaN@CMO-H) for light-driven ethanol dehydration to ethylene. Through combined experimental and computational investigations, a surface hydrogen-replenishment mechanism is proposed to disclose the ethanol dehydration pathway over GaN@CMO-H. Moreover, the surface-hydrogenated GaN@CMO-H can significantly lower the reaction energy barrier of the C 2 H 5 OH-to-C 2 H 4 conversion by switching the rate-determining reaction step compared to both GaN and GaN@CMO. Consequently, the surface-hydrogenated GaN@CMO-H illustrates a considerable ethylene production activity of 1.78 mol·g cat −1 ·h −1 with a high turnover number of 94,769 mole ethylene per mole CrMnO x . This work illustrates a new route for sustainable ethylene production with the only use of bioethanol and sunlight beyond fossil fuels.
研究领域:
材料科学
·
催化化学
·
可持续能源
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2014
·
IF 3.84
Xiaoju Luo,Xuejun Zheng,Ding Wang,Yong Zhang,Hongbin Cheng,Xianying Wang,Huaijuan Zhuang,Yanlou Lou
Through precursor, subsequent calcination and ammoniation, gallium nitride nanofibers (GaN-NFs) and gallium nitride nanoparticles (GaN-NPs) were synthesized by electrospinning and sol–gel method, respectively. The structure and morphology characteristics of the products were investigated by X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), energy dispersive X-ray spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM) and Brunauer–Emmett–Teller (BET) nitrogen adsorption–desorption measurements. Gas sensors were fabricated as side-heated structure. The ethanol sensing properties of the GaN-NFs and GaN-NPs were compared at operating temperatures from 280 to 360 °C and ethanol concentrations ranging from 50 to 1000 ppm. The results indicate that the porous GaN-NFs show improved response to ethanol with good selectivity, which is attributed to the 1D porous nanostructure . The ethanol sensing mechanism of the porous GaN-NFs was also discussed.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Jialing Zhou,Hui Huang,Shunji Chen,Mengyuan Wang,Danna Zhao,Jun Yu,Senlin Jin,Yuan Zhong,Xiaoming Chen,Xiaocai Yu,Pengbo Liu,Jian Zhao
As 3rd generation semiconductor, GaN material is promising for biosensor application, owing to its excellent chemical stability and high carrier mobility. Herein, GaN porous-layer (GNP) was self-assembly grown on GaN-coated sapphire substrate without doping by using simple low-temperature (LT) growth. The GNP with a pore density as high as ∼2.1 × 10 3 μm −2 can be realized by optimizing the growth temperature (620 °C) and layer thickness (22.4 nm), and its normalized conductivity can be tuned by simply changing the thickness. The optimized GNP was applied to chemiresistive detection of Cu 2+ with a limit of detection (LOD) as low as 8 fM, a fast response speed of 1.5 min, a wide linear range (8 fM∼8 nM) and good repeatability. The LOD was improved 1.25∼10 6 fold compared with that of previously reported biosensor. The GNP biosensor features high sensitivity, simple structure, integratability, and low-cost. To our knowledge, it is the first time that GaN material was used for chemiresistive biosensor.
研究领域:
材料科学
·
生物传感技术
·
纳米技术
✓ 已验证
DOI
高影响因子
RSC Advances
·
2012
·Vol. 2
·期 29
·10840-10843
·
IF 0
Qiu-Ping Li,Bing Yan
A novel GaN-based luminescent hybrid material has been prepared by covalently functionalizing the GaN matrices with an ionic liquid (IL), and then exchanging the anion of the IL with lanthanide complexes. 1-Methyl-3-[3-(trimethoxysilyl)propyl]imidazolium chloride, a kind of multi-functional room temperature IL, is used to silanize the hydroxylated surfaces of the GaN sample. After that, an anion exchange measurement is performed to introduce the tetrakis β-diketonate europium(III) complex anion to the GaN matrices. The FTIR spectra, UV-vis diffuse reflection absorption spectra, scanning electron micrograph, XRD patterns and photoluminescent properties (luminescence, lifetime and quantum efficiency) for the resulting material were studied in detail. The results suggest that our method is an effective way for constructing novel functional GaN based hybrid materials.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
CRYSTAL GROWTH & DESIGN
·
2022
·
IF 4.01
Baodan Liu,Qingyun Liu,Wenjin Yang,Jing Li,Xinglai Zhang,Shavkat Yuldashev,Jinlei Yao
Compared with polar c-axis GaN, nonpolar GaN crystals with different orientations show distinct optical and electrical properties and thus some promising and functional applications can be expected. In this work, we report the self-assembled nucleation and synthesis of nonpolar GaN nanowires through a conventional chemical vapor deposition approach and systematic investigation of their microstructures and crystallography using a high-resolution transmission electron microscope. Comparative optical studies on polar and nonpolar GaN nanowires using monochromic and spatially resolved cathodoluminescence spectroscopy demonstrate that nonpolar GaN nanowires show strong UV luminescence, and an obvious blue shift of the peak wavelength along the nanowire from the bottom to the top is observed, while the yellow band emission observed in polar GaN nanowires is not detected. The feasible synthetic strategy and the peculiar luminescence property of nonpolar GaN nanowires will provide predominant advantages and sufficient space for the fabrication of high-performance and high-efficiency optoelectronic nanodevices for functional applications.
研究领域:
材料科学
·
光学工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICAL CHEMISTRY
·
2021
·
IF 6.986
Danli Hu,Haiyan Cui,Xinyang Wang,Fang Luo,Bin Qiu,Weicheng Cai,Hui Huang,Jian Wang,Zhenyu Lin
An Au/GaN photoelectrode was prepared by sputtering 30 nm thick Au film on the surface of n-type gallium nitride (GaN). When the electrode contacts with multilayered molybdenum disulfide (MoS2), photogenerated electrons and photogenerated holes transfer to MoS2 because of the band gap matching of MoS2 and GaN. The presence of Au promotes charge transfer and results in a greater recombination of electrons and holes; by this means, a more significant suppression of photocurrent can be detected. This characteristic has been coupled with the high selectivity of an aptamer and applied to develop a novel photoelectrochemical aptasensor for cancer biomarkers (alpha-fetoprotein (AFP) as a model). The aptamer of AFP was modified on the surface of the Au/GaN photoelectrode by Au–S bonds, which can bind to the target protein with high selectivity. Then, the transfer process of the charge carriers of GaN to MoS2 can be blocked by the target protein so that the suppression of photocurrent is reduced. The difference of the photocurrent in the presence and absence of AFP (ΔI) showed a linear relationship with AFP concentration that ranged from 1.0–150 ng/mL (R2 = 0.9995), and the detection limit was 0.3 ng/mL. The standard addition recovery rates ranged from 85.2 to 91.7%. The method possessed good sensitivity and high selectivity for AFP detection. The developed biosensor can be modified to detect other cancer biomarkers by simply replacing the aptamer used.
研究领域:
生物传感技术
·
癌症诊断
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2024
·
IF 20.2
Sen-Wang Wang,Zhen-Hong He,Yue Tian,Zhan-Jun Zhu,Yong-Chang Sun,Kuan Wang,Weitao Wang,Yang Yang,Huan Wang,Zhao-Tie Liu
Photothermal CO 2 oxidative dehydrogenation of propane (CO 2 -ODHP) is an environmentally friendly and sustainable route for propylene production and CO 2 utilization. In the present work, we developed a Pt-GaN/SrTiO 3 dual-functional catalyst to facilitate the reaction. The catalyst achieved propylene and CO yields of 1 mmol·g cat -1 ·h -1 and 1.2 mmol·g cat -1 ·h -1 under photothermal conditions at 320 °C, surpassing the performance of previously reported catalysts. Additionally, control experiments and in situ DRIFTS analyses corroborated that GaN and Pt were primarily responsible for the activation of C-H and C O bonds, respectively, and the photothermal route worked via a distinguished intermediate for CO 2 activation in contrast to the thermal route. DFT calculations supported the reaction route involving the coupling direct dehydrogenation of propane and reverse water-gas shift reaction. The present work shines a light on the design of photothermal catalysts with dual functions, particularly for the activation of CO 2 and light hydrocarbons. Additionally, it proposes a strategy to initiate high-temperature reactions at relatively lower temperatures.
研究领域:
催化
·
化学工程
·
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2013
·
IF 3.172
Yan Zhao,Bing Yan
GaN-functionalized rare earth (Eu 3+ and Tb 3+ ) organic/inorganic mesoporous nanocomposites have been successfully synthesized (designated as RE(L SBA-15) 3 (L GaN); RE = Eu, Tb; L = TAA Si, BTA Si). The organosilane precursor materials (L SBA-15) are synthesized by co-condensation of tetraethylorthosilicate (TEOS) and the functionalized β-diketones (TAA Si and BTA Si) in the presence of Pluronic P123 surfactant as a template. The modified β-diketones ligands are also used to covalently bond with surface-modified GaN and formed another precursor L GaN. Both of the precursors can coordinate with rare earth ions to synthesize the final mesoporous materials via a sol–gel process. FTIR, TEM, XRD, and nitrogen (N 2 ) adsorption/desorption measurements are employed to characterize the mesostructure of RE(L SBA-15) 3 (L GaN). The luminescence properties and thermogravimetric analysis of all the prepared materials are characterized in detail, and the results reveal that a series of uniformed mesopore structure hybrid materials has been achieved. The mesoporous material Eu(BTA Si SBA-15) 3 (BTA Si GaN) has better luminescence intensity, higher quantum efficiency, and longer lifetime than Eu(TAA Si SBA-15) 3 (TAA Si GaN). While the nanocomposite Tb(TAA Si SBA-15) 3 (TAA Si GaN) revealed the strongest characteristic emission of Tb 3+ ions than Tb(BTA Si SBA-15) 3 (BTA Si GaN), the excellent luminescent properties and thermal stability enable the hybrid mesoporous material to have potential applications in optical field.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nature Communications
·
2025
·Vol. 16
·期 1
·1-14
·
IF 15.7
Chen Wei,Wang Danhao,Wang Weiyi,Liu Xin,Liu Yuying,Wang Chao,Kang Yang,Fang Shi,Yang Xudong,Gu Wengang,Luo Dongyang,Luo Yuanmin,Qu Zongtao,Zuo Chengjie,Kang Yi,Cheng Lin,Yan Wensheng,Hu Wei,Long Ran,He Jr-Hau,Liang Kang,Liu Sheng,Xiong Yujie,Sun Haiding
The development of an efficient and durable photoelectrode is critical for achieving large-scale applications in photoelectrochemical water splitting. Here, we report a unique photoelectrode composed of reconfigured gallium nitride nanowire-on-silicon wafer loaded with Au nanoparticles as cocatalyst that achieved an impressive applied bias photon-to-current efficiency of 10.36% under AM 1.5G one sun illumination while exhibiting stable PEC hydrogen evolution over 800 h at a high current density. Specifically, by tailoring the GaN nanowires via a simple alkaline-etching step to expose the inner (10 \(\bar{1}\bar{1}\) ) facets, we achieve a highly coupled semiconductor nanowire-cocatalyst heterointerface with strong electron interaction. The strongly coupled reconfigured GaN nanowire/Au heterointerface not only optimizes the electronic structure of Au nanoparticles to form abundant highly active interfacial regions, eventually realizing superior hydrogen evolution activity but also enables GaN nanowires to provide a stronger anchoring effect for Au nanoparticles, preventing the detachment of Au nanoparticles during the intense hydrogen evolution process. The proposed photoelectrode offers a feasible structure for overcoming the efficiency-reliability bottleneck of PEC devices for producing clean hydrogen fuel.
研究领域:
材料科学
·
能源转换
·
光催化
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nanomaterials
·
2024
·Vol. 14
·期 24
·2044
·
IF 4.4
Zhiling Chen,Kun Lv,Renqiang Zhao,Yaxian Lu,Ping Chen
Wearable devices have potential applications in health monitoring and personalized healthcare due to their portability, conformability, and excellent mechanical flexibility. However, their performance is often limited by instability in acidic or basic environments. In this study, a flexible sensor with excellent stability based on a GaN nanoplate was developed through a simple and controllable fabrication process, where the linearity and stability remained at almost 99% of the original performance for 40 days in an air atmosphere. Moreover, perfect stability was also demonstrated in acid–base environments, with pH values ranging from 1 to 13. Based on its excellent stability and piezotronic performance, a flexible device for motion monitoring was developed, capable of detecting motions such as finger, knee, and wrist bending, as well as swallowing. Furthermore, gesture recognition and intelligent fall monitoring were explored based on the bending properties. In addition, an intelligent fall warning system was proposed for the personalized healthcare application of elders by applying machine learning to analyze data collected from typical activities. Our research provides a path for stable and flexible electronics and personalized healthcare applications.
研究领域:
材料科学
·
生物医学工程
·
电子工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Yaodan Zhang,Yuanchao Xie,Hongtao Wang,Dan Han,Shengbo Sang
It is essential to improve the detection response and maintain good stability of the gas sensor to be able to effectively monitor the ppb level harmful NO 2 gas. This work was dedicated to improving the sensing performance of NO 2 gas sensors by synthesizing flower-like structure SnO 2 /GaN composites using a combination of solvothermal and ultrasonic mixing method. The introduction of GaN increased the specific surface area of SnO 2 and provided more adsorption sites. Gas-sensitive test results showed that the SnO 2 /GaN composites exhibited excellent NO 2 response (42–1 ppm of NO 2 ) and lower detection limit (100 ppb) at lower operation temperature of 130 °C. In addition, the fluctuation in the initial resistance and response of the SnO 2 /GaN composites to 20 ppm of NO 2 within one month were small. The improved sensing performance was attributed to the unique flower-like structure of SnO 2 , the excellent thermodynamic stability of GaN and the heterogeneous interface of SnO 2 /GaN. This work provides a new design strategy for the development of highly sensitive ppb-level NO 2 sensors for atmospheric environmental monitoring.
研究领域:
材料科学
·
环境科学
·
传感器技术
✓ 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）