Scanning thermo-ionic microscopy for probing local electrochemistry at the nanoscale

	Scanning thermo-ionic microscopy for probing local electrochemistry at the nanoscale
	A. Eshghinejad; E. N. Esfahani; P. Wang; S. Xie; T. C. Geary; S. B. Adler; J. Y. Li
刊名	Journal of Applied Physics
	2016
英文摘要	Conventional electrochemical characterization techniques based on voltage and current measurements only probe faradaic and capacitive rates in aggregate. In this work we develop a scanning thermo-ionic microscopy (STIM) to probe local electrochemistry at the nanoscale, based on imaging of Vegard strain induced by thermal oscillation. It is demonstrated from both theoretical analysis and experimental validation that the second harmonic response of thermally induced cantilever vibration, associated with thermal expansion, is present in all solids, whereas the fourth harmonic response, caused by local transport of mobile species, is only present in ionic materials. The origin of STIM response is further confirmed by its reduced amplitude with respect to increased contact force, due to the coupling of stress to concentration of ionic species and/or electronic defects. The technique has been applied to probe Sm-doped Ceria and LiFePO4, both of which exhibit higher concentrations of mobile species near grain boundaries. The STIM gives us a powerful method to study localelectrochemistry with high sensitivity and spatial resolution for a wide range of ionic systems, as well as ability to map local thermomechanical response. Published by AIP Publishing.
收录类别	SCI
原文出处	http://scitation.aip.org/content/aip/journal/jap/119/20/10.1063/1.4949473
语种	英语
内容类型	期刊论文
源URL	[http://ir.siat.ac.cn:8080/handle/172644/10509]
专题	深圳先进技术研究院_医工所
作者单位	Journal of Applied Physics
推荐引用方式 GB/T 7714	A. Eshghinejad,E. N. Esfahani,P. Wang,et al. Scanning thermo-ionic microscopy for probing local electrochemistry at the nanoscale[J]. Journal of Applied Physics,2016.
APA	A. Eshghinejad.,E. N. Esfahani.,P. Wang.,S. Xie.,T. C. Geary.,...&J. Y. Li.(2016).Scanning thermo-ionic microscopy for probing local electrochemistry at the nanoscale.Journal of Applied Physics.
MLA	A. Eshghinejad,et al."Scanning thermo-ionic microscopy for probing local electrochemistry at the nanoscale".Journal of Applied Physics (2016).