Quantification of adsorbed and dangling citrate ions on gold nanoparticle surface using thermogravimetric analysis
Quantification of adsorbed and dangling citrate ions on gold nanoparticle surface using thermogravimetric analysis
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DOI：
10.1038/s41598-020-65013-0
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发表时间：
2020-05-19
影响因子：
4.6
通讯作者：
Sharma, Rohit K.
中科院分区：
文献类型：
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作者：
Bajaj, Manish;Wangoo, Nishima;Sharma, Rohit K.
报道了一种利用热重分析(TGA)对金纳米颗粒表面柠檬酸根离子进行定量的新方法。对金纳米颗粒进行了热重分析，研究了柠檬酸三钠的浓度和金纳米颗粒的pH值等参数对金纳米颗粒的影响，结果表明金纳米颗粒上柠檬酸根离子的数量与pH高度相关。总的来说，观察到的柠檬酸根离子在碱性条件下更高，这与早先的看法相矛盾。这些结果也强调了热重分析作为一种新的工具来定量存在于金纳米颗粒表面的柠檬酸盐分子的重要性。因此，本方法不仅提供了对金纳米颗粒合成的机理细节的洞察，而且还开辟了利用热重分析来理解分子的纳米范围缔合的用途。
A novel approach involving thermo-gravimetricanalysis (TGA) for the quantification of citrate ions present on the surface of gold nanoparticles has been reported. TGA study was carried out on AuNPs in response to parameters such as concentration of tri-sodium citrate and pH of gold nanoparticles depicting that the number of citrate ion present on gold nanoparticles is highly pH dependent. In general, the citrate ions were observed to be higher in alkaline conditions contradicting earlier beliefs. These results also underline the significance of TGA as a novel tool for quantification of citrate molecules present on gold nanoparticle surface. Thus, the present approach not only provides with an insight into mechanistic details of gold nanoparticle synthesis but also opens the usage of TGA for understanding the nano range association of molecules.