# A Scanning AC Calorimetry Technique for the Analysis of Nano-Scale Quantities of Materials

 Title: A Scanning AC Calorimetry Technique for the Analysis of Nano-Scale Quantities of Materials Author: Vlassak, Joost J.; Xiao, Kechao; Gregoire, John M.; McCluskey, Patrick J. Note: Order does not necessarily reflect citation order of authors. Citation: Xiao, Kechao, John M. Gregoire, Patrick J. McCluskey, and Joost J. Vlassak. 2012. A scanning AC calorimetry technique for the analysis of nano-scale quantities of materials. Review of Scientific Instruments 83(11): 114901. Full Text & Related Files: Final_manuscript _for_resubmission.docx (4.026Mb; Microsoft Word 2007)  Final_manuscript _for_resubmission.pdf (2.191Mb; PDF) Abstract: We present a scanning AC nanocalorimetry method that enables calorimetry measurements at heating and cooling rates that vary from isothermal to $$2×10^3 K/s$$, thus bridging the gap between traditional scanning calorimetry of bulk materials and nanocalorimetry. The method relies on a micromachined nanocalorimetry sensor with a serpentine heating element that is sensitive enough to make measurements on thin-film samples and composition libraries. The ability to perform calorimetry over such a broad range of scanning rates makes it an ideal tool to characterize the kinetics of phase transformations or to explore the behavior of materials far from equilibrium. We demonstrate the technique by performing measurements on thin-film samples of Sn, In, and Bi with thicknesses ranging from 100 to 300 nm. The experimental heat capacities and melting temperatures agree well with literature values. The measured heat capacities are insensitive to the applied AC frequency, scan rate, and heat loss to the environment over a broad range of experimental parameters. Published Version: doi:10.1063/1.4763571 Other Sources: http://www.ncbi.nlm.nih.gov/pubmed/23206083 Terms of Use: This article is made available under the terms and conditions applicable to Open Access Policy Articles, as set forth at http://nrs.harvard.edu/urn-3:HUL.InstRepos:dash.current.terms-of-use#OAP Citable link to this page: http://nrs.harvard.edu/urn-3:HUL.InstRepos:10728848 Downloads of this work: