Excess Enthalpy and Luminescence Studies of SnO2 Nanoparticles

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Abstract:

The extra reactivity of nano materials is attributed to the excess surface energy stored in the sample. The excess enthalpy of SnO2 nano-particles were measured as a function of particle size using a calvet calorimeter. SnO2 with particle size 11, 27, 47 nm and bulk samples (1 m) were dropped from room temperature to 987, 936 and 885 K and their HTH298 values were determined. The excess enthalpies for SnO2 samples with particle sizes 11, 27and 47 nm compared to the bulk sample calculated from the difference between HTH298 values of the nano and the bulk samples were found to be 15.06, 3.05, 2.21 kJ ยท mol−1 respectively. Luminescence experiments reveal that the surface trap electron density decreases with increase of particle size. The excess enthalpy is related to the surface trap intensity.

Keywords: ENTHALPY; EXCESS SURFACE ENERGY; LUMINESCENCE; NANOPARTICLES; SURFACE TRAP

Document Type: Research Article

DOI: http://dx.doi.org/10.1166/jnn.2008.AN29

Publication date: August 1, 2008

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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