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Thermogravimetric Analysis. The TGA curves of the
OctTe(dO)-Au and OctS-Au NPs are compared in Figure 11.
A distinct two-step weight loss process was observed for the
OctTe(dO)-Au NPs (Figure 11a), which was significantly
different from the roughly one-step-like weight loss process
observed on the OctS-Au NPs (Figure 11b). The first weight
loss of ∼11.0% was observed in the temperature range from
∼100 to∼270 ¡ãC, and the second weight loss of∼11.2% occurred
between ∼605 and ∼800 ¡ãC. Shiny gold pieces were observed
only after the second weight loss. Thus, the first weight loss was
probably due to the destruction of the alkyl chains of ligands,
and the second was probably due to the remaining tellurium
oxide leaving the surface of Au NPs. In other words, the C-Te
bond was broken in the first step, and Te-Au bond breaking
occurred in the second step. In contrast, the OctS-AuNPs showed
a dominate weight loss (25%) from ∼100 to ∼220 ¡ãC, followed
by a small additional 3% weight loss that ended at∼500 ¡ãC. That
is, all ligands of OctS-Au NPs were gone before the temperature
reached 500 ¡ãC. After comparing the temperature of Te-Au
bond breaking with that of S-Au, it could be concluded that the
Te-Au NP bond is stronger than the S-Au bond.
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5Â¥2009-10-12 18:59:23
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¡ï
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weight loss peak
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2Â¥2009-10-12 15:57:01
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Ó¦¸ÃÊÇweight loss £¬¼Ó peak ¾Í¶àÓàÁË¡£
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4Â¥2009-10-12 18:57:03
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¡ï ¡ï ¡ï ¡ï ¡ï
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to obtain the same weight loss rate,
relevant temperature increased with the enhancement of heating rates. When temperature was above 391.2¡æ £¬
thermogravimetric law was not impacted essentially by the heating rates with 20¡æ/min or higher, however, the
maximum weight loss
took place when the heating rate was 10¡æ/min. Weight loss of wheat straw was not influenced
obviously by the Ni-catalyst. Thermogravimetric dynamic parameters of wheat straw were calculated without catalyst
and with 0.5% Ni-catalyst by the methods of Kissinger and Ozawa, respectively;
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