Figure - PMC

Skip to main content

An official website of the United States government

Here's how you know

Here's how you know

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.

View full-text article in PMC

. 2019 Oct 10;9:14572. doi: 10.1038/s41598-019-50802-z

Search in PMC
Search in PubMed
View in NLM Catalog
Add to search

© The Author(s) 2019

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

PMC Copyright notice

(a) Optical image of CNT/PC sample. Composite materials containing CNTs have an almost completely black surface, and the conventional optical method is not effective with these kinds of materials. (b–e) from top to bottom, low-magnification infrared, conventional-accumulation, intensity and phase images of the same sample shown in (a). In the infrared image, the sample showed a relatively flat and clean surface except for some particles and scratches. Moreover, the conventional method images showed only some blurred intensity distribution as shown in (c). The intensity (d) and phase (e) images show the heat distributions reflecting the network structures and local resistance. The pairs of arrow indicated in (d) indicate the higher-resistance cross sections across the current flow direction. (f–k) The middle- (f–h) and high- (i–k) magnification images show the pair of hot spots near the high-resistance cross section shown in (d). The narrow conductive channel and voltage concentration are clearly observed in these results. All LIT images were obtained by applying 60-V and 6.4-mA bias conditions and using 10-minute accumulation.