Can anyone tell me how I can prepare hollow shell gold nanoparticles of less than 50 nm?

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How gold procurement?

Please note it

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How gold procurement?

https://www.cleanteqwater.com/resources/case-studies/gold-mine-australia/

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Subhra Jana

You will find the information from this paper.

Adv. Mater., 2003, 15, 641. (DOI: 10.1002/adma.200301639)

Rakesh Kumar Tekade

Thanks Subhra

Jose E Arevalo-Fester

You could try using carbon nanospheres as a template, and decorate them with gold. After that just remove carbon core with thermal oxidation.