Growth and ultralow thermal conductivity of beta-Ga2O3 nanowires

IF 2.7 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Materials Letters Pub Date : 2025-03-29 DOI:10.1016/j.matlet.2025.138425

Jiafu Zhong , ZhiJie Wang , Zuoran Li , Lijie Zhu , Shiyun Lou , Shaomin Zhou

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Abstract

β-Ga₂O₃ nanowires were prepared on C-plane sapphire substrates with coated Au serving as a catalyst via chemical vapor deposition. The morphologies, structural properties and elemental composition of the products were characterized by scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, transmission electron microscopy and Raman spectroscopy. The results show that the products are single crystalline β-Ga₂O₃ nanowires with the diameter ranging from 40 to 100 nm and the length ranging from 10 to 50 μm, respectively. In addition, the optical and thermal properties of the β-Ga₂O₃ nanowires have been studied by photoluminescence spectrometer and laser thermal conductivity instrument. These β-Ga₂O₃ nanowires have exhibited a broad blue-green emission with a peak at 487 nm and an ultralow thermal conductivity (0.026 W/m K) in the room-temperature, which is potential application in the future.

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β - ga2o3纳米线的生长和超低导热性能

采用化学气相沉积法在c -平面蓝宝石衬底上制备了β-Ga2O3纳米线。采用扫描电镜、x射线衍射、x射线光电子能谱、透射电镜和拉曼光谱对产物的形貌、结构性能和元素组成进行了表征。结果表明：所得产物为单晶β-Ga2O3纳米线，直径为40 ~ 100 nm，长度为10 ~ 50 μm；此外，利用光致发光光谱仪和激光导热仪研究了β-Ga2O3纳米线的光学和热性能。这些β-Ga2O3纳米线在487 nm处具有较宽的蓝绿色发光峰，在室温下具有超低的导热系数（0.026 W/m K），具有潜在的应用前景。

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来源期刊

Materials Letters 工程技术-材料科学：综合

CiteScore

5.60

自引率

3.30%

发文量

1948

审稿时长

50 days

期刊介绍： Materials Letters has an open access mirror journal Materials Letters: X, sharing the same aims and scope, editorial team, submission system and rigorous peer review. Materials Letters is dedicated to publishing novel, cutting edge reports of broad interest to the materials community. The journal provides a forum for materials scientists and engineers, physicists, and chemists to rapidly communicate on the most important topics in the field of materials. Contributions include, but are not limited to, a variety of topics such as: • Materials - Metals and alloys, amorphous solids, ceramics, composites, polymers, semiconductors • Applications - Structural, opto-electronic, magnetic, medical, MEMS, sensors, smart • Characterization - Analytical, microscopy, scanning probes, nanoscopic, optical, electrical, magnetic, acoustic, spectroscopic, diffraction • Novel Materials - Micro and nanostructures (nanowires, nanotubes, nanoparticles), nanocomposites, thin films, superlattices, quantum dots. • Processing - Crystal growth, thin film processing, sol-gel processing, mechanical processing, assembly, nanocrystalline processing. • Properties - Mechanical, magnetic, optical, electrical, ferroelectric, thermal, interfacial, transport, thermodynamic • Synthesis - Quenching, solid state, solidification, solution synthesis, vapor deposition, high pressure, explosive