Nanoscale Thermal Response in ZnO Varistors by Atomic Force Microscopy
ZHAO Kun-Yu1,2, ZENG Hua-Rong1, LI Guo-Rong1, SONG Hong-Zhang1, CHENG Li-Hong1,2, HUI Sen-Xing1, YIN Qing-Rui1
1State Key Lab of High Performance Ceramics and Superfine Structures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 2000502Graduate School of the Chinese Academy of Sciences, Beijing 100049
Nanoscale Thermal Response in ZnO Varistors by Atomic Force Microscopy
ZHAO Kun-Yu1,2, ZENG Hua-Rong1, LI Guo-Rong1, SONG Hong-Zhang1, CHENG Li-Hong1,2, HUI Sen-Xing1, YIN Qing-Rui1
1State Key Lab of High Performance Ceramics and Superfine Structures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 2000502Graduate School of the Chinese Academy of Sciences, Beijing 100049
摘要We report the application of customer-built scanning thermal microscopy (SThM) based on a commercial atomic force microscope to investigate local thermal inhomogeneity of ZnO varistors. The so-called 3ω method, generally used for measuring macroscale thermal conductivity, is set up and integrated with an atomic force microscope to probe the nanoscale thermal property. Remarkably, thermal contrasts of ZnO varistors are firstly imaged by the SThM, indicating the uniform distribution of spinel phases at triple points. The frequency-dependent thermal signal of ZnO varistors is also studied to present quantitative evaluation of local thermal conductivity of the sample.
Abstract：We report the application of customer-built scanning thermal microscopy (SThM) based on a commercial atomic force microscope to investigate local thermal inhomogeneity of ZnO varistors. The so-called 3ω method, generally used for measuring macroscale thermal conductivity, is set up and integrated with an atomic force microscope to probe the nanoscale thermal property. Remarkably, thermal contrasts of ZnO varistors are firstly imaged by the SThM, indicating the uniform distribution of spinel phases at triple points. The frequency-dependent thermal signal of ZnO varistors is also studied to present quantitative evaluation of local thermal conductivity of the sample.
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2009, Vol. 26 
