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Heat capacity measurements of two-dimensional self-assembled hexadecanethiol monolayers on polycrystalline gold
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10.1063/1.1764938
/content/aip/journal/apl/84/25/10.1063/1.1764938
http://aip.metastore.ingenta.com/content/aip/journal/apl/84/25/10.1063/1.1764938
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Figures

Image of FIG. 1.
FIG. 1.

curve for 3D on nanoparticles using the nanocalorimeter technique at a scan rate of . Inset (a): top-view schematic diagram of the MEMS-based sensor. Inset (b): curve for a single crystal polyethylene measured by the same type calorimeter (Ref. 20 ), which demonstrates the sensitivity and temperature resolution of the TDSC.

Image of FIG. 2.
FIG. 2.

(a) data of the first and second scans with a maximum scanning temperature to for 2D on planar surface. The large shift of the melting temperature from the first scan to the second scan is due to desorption of the alkanethiol (see sharp onset of at ). The heat of fusion for the partially desorbed sample (second scan) is . Inset: the schematic of 2D on planar surface. (The square dots represent the expected baseline for the specific heat of .) (b) Comparison of the data for both 2D and 3D after the baseline has been subtracted.

Image of FIG. 3.
FIG. 3.

A series of curves of multiple scans with two different maximum scanning temperatures. The series (LN2 temperature to 200°C) shows the gradual desorption of 2D which is indicated by the decrease in data. There is a loss of mass and a decrease in the heat (area under the curve) of melting during this series. After the series the sample is scanned to (LN2 temperature to ). Most of the remaining alkanethiol molecules desorb in the first few pulses during these high temperature scans.

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/content/aip/journal/apl/84/25/10.1063/1.1764938
2004-06-10
2014-04-23
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Heat capacity measurements of two-dimensional self-assembled hexadecanethiol monolayers on polycrystalline gold
http://aip.metastore.ingenta.com/content/aip/journal/apl/84/25/10.1063/1.1764938
10.1063/1.1764938
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