Thermally activated conductance of three different CVD grown free-standing polycrystalline diamond sheets

IF 4.3 3区材料科学 Q2 MATERIALS SCIENCE, COATINGS & FILMS Diamond and Related Materials Pub Date : 2025-02-19 DOI:10.1016/j.diamond.2025.112128

Yimeng Zhao , Shirun Huang , Mingyu Yin , Jiawei Li , Shuqian Rui , Jiesen Zhang , Hongwei Zhu , Qiao Chen

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Abstract

The applications of diamond in temperature sensing are gaining attention, while the influence of various growth processes on thermal sensitivity remains unclear. In this study, thermistors were fabricated based on free-standing polycrystalline diamond (PD) sheets synthesized through three different techniques: hot filament chemical vapor deposition (HFCVD), microwave plasma chemical vapor deposition (MPCVD), and direct current arc plasma jet chemical vapor deposition (DCCVD). The results indicate that the diamond produced with a high density of grain boundaries, defects, and a (110) texture, exhibits optimal thermal sensitivity. The thermistor based on HFCVD-diamond shows an extremely high thermal constant (B_25/300: 8133 K), while thermistors made from diamonds synthesized by MPCVD and DCCVD show negligible thermally activated conductivity at room temperature. Analysis of the impedance spectrum reveals grain boundaries play a crucial role in the thermal sensitization mechanism of PD sheet grown by HFCVD, whereas in samples synthesized by MPCVD and DCCVD, the grains themselves are more influential.

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金刚石在温度传感方面的应用越来越受到关注，但各种生长过程对热敏性的影响仍不清楚。在这项研究中，利用热丝化学气相沉积（HFCVD）、微波等离子体化学气相沉积（MPCVD）和直流电弧等离子体喷射化学气相沉积（DCCVD）三种不同技术合成的独立多晶金刚石（PD）片制造了热敏电阻。结果表明，生产出的金刚石具有高密度的晶界、缺陷和 (110) 纹理，具有最佳的热灵敏度。基于 HFCVD 金刚石的热敏电阻显示出极高的热常数（B25/300：8133 K），而由 MPCVD 和 DCCVD 合成的金刚石制成的热敏电阻在室温下的热激活电导率几乎可以忽略不计。阻抗谱分析显示，晶界在 HFCVD 生长的 PD 片的热敏机制中起着关键作用，而在 MPCVD 和 DCCVD 合成的样品中，晶粒本身的影响更大。

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来源期刊

Diamond and Related Materials 工程技术-材料科学：综合

CiteScore

6.00

自引率

14.60%

发文量

702

审稿时长

2.1 months

期刊介绍： DRM is a leading international journal that publishes new fundamental and applied research on all forms of diamond, the integration of diamond with other advanced materials and development of technologies exploiting diamond. The synthesis, characterization and processing of single crystal diamond, polycrystalline films, nanodiamond powders and heterostructures with other advanced materials are encouraged topics for technical and review articles. In addition to diamond, the journal publishes manuscripts on the synthesis, characterization and application of other related materials including diamond-like carbons, carbon nanotubes, graphene, and boron and carbon nitrides. Articles are sought on the chemical functionalization of diamond and related materials as well as their use in electrochemistry, energy storage and conversion, chemical and biological sensing, imaging, thermal management, photonic and quantum applications, electron emission and electronic devices. The International Conference on Diamond and Carbon Materials has evolved into the largest and most well attended forum in the field of diamond, providing a forum to showcase the latest results in the science and technology of diamond and other carbon materials such as carbon nanotubes, graphene, and diamond-like carbon. Run annually in association with Diamond and Related Materials the conference provides junior and established researchers the opportunity to exchange the latest results ranging from fundamental physical and chemical concepts to applied research focusing on the next generation carbon-based devices.