Many important material properties characteristics can be measured using thermalanalysis techniques, but macro-systems aren’t ideal for all applications. Conventionalsystems require large samples, preventing size-dependent studies on thermodynamicproperties of a material. Furthermore, some materials cannot be synthesized to thenecessary volumes. With the recent advancements in the area of microsensors,nanothermal analysis has improved and gained research interest.This work presents recent thermal analysis applications performed with a heatedmicrocantilever. Heated microcantilevers have low thermal mass, resulting in high heatingrates with quick response times, and are relative isolated to major heat losses, making themwell suited for nanothermal analysis. This work discusses the first reported implementationof a microsensor to perform calorimetry and thermogravimetry simultaneously. Thesetechniques were used to investigate thermal dependencies for two studies. The first studydiscusses nano-thermogravimetry and calorimetry on a 250 pg coal sample. Heat flow andmass change of the sample was measured and used to determine the specific heat capacity.Thermal contact resistance between the heater and the sample was problematic, resulting inuncertainties, and limited the studies investigation into its size-dependent thermalproperties. The second study discussed the thermal desorption of mercury from a thin goldfilm. It was founded that there are two distinct desorption regime that appear to correlatewith the unbinding of mono- and multi-layers of mercury. Furthermore, the ambiguousregeneration temperature was found to be 200 °C, regardless of heating rates. This newsensing technique is another tool to help expand the field of nanothermal analysis.
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Simultaneous nanothermal analysis using heated microcantilevers
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