Quantitative temperature measurement of an electrically heated carbon nanotube using the null-point method

Jaehun Chung, Kyeongtae Kim, Gwangseok Hwang, Ohmyoung Kwon, Seungwon Jung, Junghoon Lee, Jae Woo Lee, Gyu Tae Kim

Research output: Contribution to journalArticlepeer-review

37 Citations (Scopus)


Previously, we introduced the double scan technique, which enables quantitative temperature profiling with a scanning thermal microscope (SThM) without distortion arising from heat transfer through the air. However, if the tip-sample thermal conductance is disturbed due to the extremely small size of the sample, such as carbon nanotubes, or an abrupt change in the topography, then quantitative measurement becomes difficult even with the double scan technique. Here, we developed the null-point method by which one can quantitatively measure the temperature of a sample without disturbances arising from the tip-sample thermal conductance, based on the principle of the double scan technique. We first checked the effectiveness and accuracy of the null-point method using 5μm and 400 nm wide aluminum lines. Then, we quantitatively measured the temperature of electrically heated multiwall carbon nanotubes using the null-point method. Since the null-point method has an extremely high spatial resolution of SThM and is free from disturbance due to the tip-sample thermal contact resistance, and distortion due to heat transfer through the air, the method is expected to be widely applicable for the thermal characterization of many nanomaterials and nanodevices.

Original languageEnglish
Article number114901
JournalReview of Scientific Instruments
Issue number11
Publication statusPublished - 2010 Nov

ASJC Scopus subject areas

  • Instrumentation


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