CRYSTENGCOMM
·
2022
·Vol. 24
·期 9
·1789-1794
·
IF 3.756
Yanan Zhang,Shujie Jiao,Junhua Zhang,Shuo Liu,Dongbo Wang,Shiyong Gao,Jinzhong Wang
A GaOOH/Ga2O3 heterojunction was obtained by a one-step annealing treatment at a certain temperature. The solar blind photoresponse performance of the GaOOH/Ga2O3 heterojunction was characterized through photoelectrochemical detectors, providing a simple and effective method for pure solar-blind ultraviolet detection. The results showed that the maximum responsivity of the α-GaOOH/α-Ga2O3 heterojunction detector is 0.29 mA W−1 at 250 nm, which is 370% and 145% higher than that of the α-GaOOH and α-Ga2O3 detectors, respectively. The calculated solar-blind/visible detection ratio and light-to-dark current ratio of the detector are also significantly improved compared with the α-Ga2O3 and α-GaOOH detectors, reflecting better pure solar-blind ultraviolet detection performance. The photoresponse mechanism has been studied systemically.
研究领域:
材料科学
·
光电子学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Minghua Wang,Dan Guo,Bochong Wang,Jianyong Xiang,Kun Zhai,Tianyu Xue,Fusheng Wen,Yingchun Cheng,Congpu Mu
In this work, MIL-96 (Ga) was successfully synthesized by a microwave-assisted method and pyrolyzed at 700 o C to obtain Ga 2 O 3 /C (G-700) composites. After carbonization, Ga 2 O 3 nanoparticles were uniformly embedded in a porous carbon skeleton. The surface of MIL-96(Ga)-derived Ga 2 O 3 /C was used as a template for directional pyrrole polymerization. G-700@PPy composite materials were obtained by in-situ polymerization of pyrrole on the surface of G-700. A hierarchical interfacial structure was created with regulated dielectric properties. The effect of pyrrole doping content on the electromagnetic waves (EMWs) absorption properties of G-700@PPy composite materials was studied. The experimental result showed that the minimum reflection loss ( RL min ) value of G-700@PPy-3 composite materials reached -79.0 dB under a thin thickness of 1.58 mm, and the maximum effective absorption bandwidth (EAB) of 5.66 GHz was obtained under 1.78 mm. The results indicate that highly conductive PPy could significantly improve the impedance matching conditions and electromagnetic attenuation capacity of G-700 composite materials, which provided an important idea for optimizing the microwave absorption properties of low permittivity composites.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
NANOTECHNOLOGY
·
2024
·Vol. 35
·期 16
·165502
·
IF 2.9
Yongfeng Zhang,Shuainan Liu,Ruiliang Xu,Shengping Ruan,Caixia Liu,Yan Ma,Xin Li,Yu Chen,Jingran Zhou
β-Ga2O3 has been widely investigated for its stability and thermochemical properties. However, the preparation of β-Ga2O3 thin films requires complex growth techniques and high growth temperatures, and this has hindered the application of β-Ga2O3 thin films. In this study, β-Ga2O3 thin films with good crystalline quality were prepared using a green method, and an ultraviolet (UV) detector based on β-Ga2O3 with a photocurrent of 2.54 × 10–6 A and a dark current of 1.19 × 10–8 A has been developed. Two-dimensional materials have become premium materials for applications in optoelectronic devices due to their high conductivity. Here, we use the suitable energy band structure between Nb2C and Ga2O3 to create a high carrier migration barrier, which reduces the dark current of the device by an order of magnitude. In addition, the device exhibits solar-blind detection, high responsiveness (28 A W−1) and good stability. Thus, the Nb2C/β-Ga2O3 heterojunction is expected to be one of the promising devices in the field of UV photoelectric detection.
研究领域:
材料科学
·
光电子学
✓ 已验证
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Xun Tang,Xin Huang,Yongmin Huang,Yong Gou,James Pastore,Yao Yang,Yin Xiong,Jiangfeng Qian,Joel D. Brock,Juntao Lu,Li Xiao,Héctor D. Abruña,Lin Zhuang
There is a great deal of interest in developing battery systems that can exhibit self-healing behavior, thus enhancing cyclability and stability. Given that gallium (Ga) is a metal that melts near room temperature, we wanted to test if it could be employed as a self-healing anode material for lithium-ion batteries (LIBs). However, Ga nanoparticles (NPs), when directly applied, tended to aggregate upon charge/discharge cycling. To address this issue, we employed carbon-coated Ga2O3 NPs as an alternative. By controlling the pH of the precursor solution, highly dispersed and ultrafine Ga2O3 NPs, embedded in carbon shells, could be synthesized through a hydrothermal carbonization method. The particle size of the Ga2O3 NPs was 2.6 nm, with an extremely narrow size distribution, as determined by high-resolution transmission electron microscopy and Brunauer–Emmett–Teller measurements. A lithium-ion battery anode based on this material exhibited stable charging and discharging, with a capacity of 721 mAh/g after 200 cycles. The high cyclability is due to not only the protective effects of the carbon shell but also the formation of Ga0 during the lithiation process, as indicated by operando X-ray absorption near-edge spectroscopy.
研究领域:
材料科学
·
能源存储
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CRYSTENGCOMM
·
2024
·
IF 2.6
yufei Song,Xiaojie Guo,Wenxiang Mu,Xutang Tao,Zeliang Gao
β-Ga2O3 is an ultra-wide bandgap semiconductor with immense potential applications in high voltage, electronic devices, and deep-ultraviolet optoelectronic devices, etc. However, to date, the growth of bulk β-Ga2O3 crystals has predominantly utilized melt methods, which are heavily dependent on specific growth vessels. In this work, bulk crystal β-Ga2O3 with a size of 7 × 13 × 4 mm3 is grown using TeO2-Li2CO3 as flux by a top-seeded solution growth (TSSG) method for the first time. It is noteworthy that the saturation point of β-Ga2O3 in the flux has been reduced to 1023 K, significantly lower than its melting point of 2073 K. The resulting β-Ga2O3 crystal exhibits well-formed faces, predominantly the (010), (100), (01(-)1), and (11(-)1(-)) forms, which closely align with the ideal morphological predictions made by the Bravais-Friedel and Donnay-Harker methods.The full-width at half maximum (FWHM) of the rocking curves for the (010) oriented plane is determined to be 140.4″. This work provides a potential β-Ga2O3 crystal growth method with a little platinum loss at a low temperature.
研究领域:
材料科学
·
半导体物理
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2018
·Vol. 8
·期 4
·263
·
IF 3.504
Jin Liu,Huihui Gan,Hongzhang Wu,Xinlei Zhang,Jun Zhang,Lili Li,Zhenling Wang
Porous hollow Ga2O3nanoparticles were successfully synthesized by a hydrolysis method followed by calcination. The prepared samples were characterized by field emission scanning electron microscope, transmission electron microscope, thermogravimetry and differential scanning calorimetry, UV-vis diffuse reflectance spectra and Raman spectrum. The porous structure of Ga2O3nanoparticles can enhance the light harvesting efficiency, and provide lots of channels for the diffusion of Cr(VI) and Cr(III). Photocatalytic reduction of Cr(VI), with different initial pH and degradation of several organic substrates by porous hollow Ga2O3nanoparticles in single system and binary system, were investigated in detail. The reduction rate of Cr(VI) in the binary pollutant system is markedly faster than that in the single Cr(VI) system, because Cr(VI) mainly acts as photogenerated electron acceptor. In addition, the type and concentration of organic substrates have an important role in the photocatalytic reduction of Cr(VI).Keywords:Ga2O3;porous;Cr(VI);organic pollutants
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ADVANCED MATERIALS
·
2025
·
IF 26.8
Liyan Wang,Shuai Liu,Ziyuan Liu,Mengjiao Han,Jiehui Tian,Yuchuan Xiao,Qitian Chen,Debo Hu,Lizhi Zhang,Lixing Kang,Qing Dai
Beta-phase gallium sesquioxide ( β -Ga 2 O 3 ), possessing an ultrawide bandgap and high breakdown voltage, exhibits strong potential for deep-ultraviolet photodetection and high-power electronics. However, nanometer-scale line defects, prevalent in β -Ga 2 O 3 growth, degrade device performance by increasing leakage currents and reducing breakdown voltages, thus termed “killer defects”. Critically, the impact of these defects at the atomic scale remains unclear due to limited characterization and a lack of detailed understanding. Here, the observation of novel conductive atomic line defects is reported within β -Ga 2 O 3 nanoflakes using near-field infrared imaging. Combining atomic-resolution imaging with density functional theory calculations, these defects are identified as interstitial Ga atoms migrating along the c -axis. These atomic line defects exhibit a broadband infrared response and quenched cathodoluminescence, indicative of significantly enhanced local conductivity. This elevated conductivity enables subsurface near-field detection of the defects and remote excitation of phonon polaritons in a hexagonal boron nitride ( h BN) capping layer. These findings underscore the distinct conductivity of atomic-scale line defects, emphasizing the need for their controlled management during material synthesis and device fabrication, while simultaneously suggesting opportunities for their exploitation in nanophotonic applications.
研究领域:
材料科学
·
物理学
·
纳米光学
✓ 已验证
DOI
PubMed
高影响因子
ACS Catalysis
·
2021
·
IF 13.084
Yong Xu,Xuchun Wang,Di Yang,Zeyuan Tang,Muhan Cao,Huicheng Hu,Linzhong Wu,Lijia Liu,John McLeod,Haiping Lin,Youyong Li,Yeshayahu Lifshitz,Tsun-Kong Sham,Qiao Zhang
The conversion of light alkanes to olefins (e.g., ethylene, propylene, or butylene) is crucial to the chemical industry. ZrO2 with oxygen vacancies has recently been regarded as a promising catalyst for the direct dehydrogenation of light alkanes. However, the intrinsic mechanism of the effect of oxygen vacancies on catalytic performance has not been completely understood yet, and ZrO2 without promoters generally displays poor activity toward the direct dehydrogenation of light alkanes. In this work, we demonstrate that the oxygen vacancies in ZrO2 can be poisoned by H atoms during the dehydrogenation of light alkanes, and we report a strategy for stabilizing the oxygen vacancies in ZrO2 by Ga2O3. Experimental results and theoretical calculations indicate that ZrO2 with oxygen vacancies is responsible for dehydrogenation, while Ga2O3 prevents the poisoning of oxygen vacancies by dissociated hydrogen atoms which, in the absence of the Ga2O3 component, blocks further dehydrogenation. Consequently, the optimal Zr0.26Ga1 catalyst exhibits superior propane dehydrogenation performance to the industrial Pt–Sn catalyst, the state-of-the-art catalyst for the direct dehydrogenation of light alkanes. We anticipate this work may shed light on both the fundamental research of catalysis and the chemical industry.
研究领域:
催化化学
·
材料科学
·
工业化学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2013
·
IF 5.257
Xiaofang Li,Xiuzheng Zhen,Sugang Meng,Jiangjun Xian,Yu Shao,Xianzhi Fu,Danzhen Li
Coupling photocatalysts with photonic crystals structure is based on the unique property of photonic crystals in confining, controlling, and manipulating the incident photons. This combination enhances the light absorption in photocatalysts and thus greatly improves their photocatalytic performance. In this study, Ga2O3 photonic crystals with well-arranged skeleton structures were prepared via a dip-coating infiltration method. The positions of the electronic band absorption for Ga2O3 photonic crystals could be made to locate on the red edge, on the blue edge, and away from the edge of their photonic band gaps by changing the pore sizes of the samples, respectively. Particularly, the electronic band absorption of the Ga2O3 photonic crystal with a pore size of 135 nm was enhanced more than other samples by making it locate on the red edge of its photonic band gap, which was confirmed by the higher instantaneous photocurrent and photocatalytic activity for the degradation of various organic pollutants under ultraviolet light irradiation. Furthermore, the degradation mechanism over Ga2O3 photonic crystals was discussed. The design of Ga2O3 photonic crystals presents a prospective application of photonic crystals in photocatalysis to address light harvesting and quantum efficiency problems through manipulating photons or constructing photonic crystal structure as groundwork.
研究领域:
材料科学
·
环境科学
·
光学
✓ 已验证
DOI
高影响因子
Environmental Science-Nano
·
2020
·Vol. 7
·期 8
·2229-2239
·
IF 7.683
Xianjun Tan,Guanhan Chen,Dingyu Xing,Wenhui Ding,Hao Liu,Ting Li,Yuxiong Huang
More and more attention has been redirected to per- and polyfluorinated alkyl substances (PFASs), particularly perfluorooctanoic acid (PFOA), owing to their ecotoxicity and environmental risks. As one of the major emerging and persistent contaminants in the environment, the current treatment processes could not remove PFOA efficiently. The recent advances in heterogeneous photocatalysis have demonstrated high efficiencies in degrading persistent contaminants, which provides an alternative approach for PFOA removal. Notably, Ga2O3-based photocatalysts exhibited great potential for PFOA remediation due to their high oxidizing capability and energy sustainability. Thus, Ga2O3 hierarchical nanosheets modified by a series of transition metals were rationally developed, and applied as heterogeneous photocatalysts for fast and efficient PFOA degradation. Noteworthily, the indium modified Ga2O3 hierarchical nanosheets achieved prominent PFOA decomposition activity, which can completely degrade 20 mg L−1 PFOA within 1 hour. The In–Ga2O3 hierarchical composites have dramatically enhanced the degradation kinetics for PFOA, which was 7.8 times higher than that of pristine Ga2O3. With in-depth mechanism investigation, we have demonstrated that In modification can not only enhance light harvesting and suppress photogenerated carrier recombination, but also favor the improvement of the adsorption ability for PFOA through the coexistence of monodentate and bidentate/bridging coordination modes. The transition metals–modification strategy paves the way for fabricating high-performance nanoscale photocatalysts for the removal of PFASs in water.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2024
·
IF 4.2
Jizhou Yang,Tianxin Kang,Peipei Han,Wenhui Chen,Zhiyuan Chen,Zhi Wan,Zhigang Liu,Feng Teng,Peng Hu,Haibo Fan
Semiconductor-assisted photocatalytic treatment has been regarded as a promising technique to dispose the dye-contaminated wastewater and gained pronounced attention recently. Here, we demonstrated a kind of Ga 2 O 3 nanometer hollow sphere photocatalysis by template-assisted technique and applied it on the degradation of Rhodamine B (RhB). It was found that the hollow spherical structure of photocatalyst can greatly enhance the photo absorption and reduce the recombination of photogenerated carriers , thus improve the photocatalytic performance. This study provides a new method for efficient photocatalytic degradation of RhB, and provides a new idea for subsequent degradation work.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
CATALYSIS LETTERS
·
2022
·Vol. 153
·期 10
·2950-2958
·
IF 2.936
Hou Huilin,Yang Wenxiang,Sun Hong,Zhang Huaqin,Feng Xiaolong,Kuang Yongbo
Ga 2 O 3 have attracted considerable attention in the field of photocatalysis. However, the preparation of 1D nanostructured Ga 2 O 3 photocatalyst with high purity and controllable structures is still in challenge. Herein, we report the synthesis of Ga 2 O 3 nanofibers with controllable structures by using electronspinning method and annealing treatment. The SEM, TEM, XRD and XPS results revealed that the produced Ga 2 O 3 photocatalysts have three different morphologies, including nanofibers, nanofibers/nanobelts and nanobelts, which was obtained by tailoring the raw materials and electronspinning parameters. The photocatalytic hydrogen evolution results show that the Ga 2 O 3 nanofibers display the highest hydrogen evolution rate among the three samples. The excellent photocatalytic performance of Ga 2 O 3 nanofibers photocatalyst could be resulted from its larger BET specific surface area and pore volume, which can provide more active sites and shorten the charge transfer distance. Graphical Abstract We report the controlled preparation of Ga2O3 nanofibers forphotocatalytic hydrogen evolution.
研究领域:
材料科学
·
光催化
✓ 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）