I am trying to check the performance (efficiency of nanoparticles for heat generation) of green synthesized Iron oxide, Gold nanoparticles and their composite for photo-thermal therapy. I have used a pulsed laser at 40W/cm^2 for 10 min at wavelength according to nanoparticles absorption.
1. Iron Oxide samples (absorption at wavelength ~1064 nm) at different concentartions. from 0.25 -10 mg/ml giving a 35°C maximum temperature rise.
2. 1mM Gold nanoparticles (absorption at wavelength 532 nm) at different power 0.5W, 1.0W & 1.5W are giving 12°C maximum temperature rise.
But when I am trying to check the performance of Iron-gold composite (having absorption at 1064 nm), composites are not showing sufficient rise in temperature (only 10°C rise).
Can anyone please suggest me how to troubleshoot the problem. It may be an experimental error ? or there could be problem in nanoparticles fabrication (Also, I had a doubt of degradation of samples. So I have tried experiment with fresh synthesized Iron-gold composite samples) ?
In my opinion, the gold and iron oxide nanoparticles are poorly cleaned. For example, magnetite nanoparticles with thiol groups can form a composite with iron nanoparticles. The organic layer between the nanoparticles can change the heat capacity of both nanoparticles.
Sir, should I properly wash the composite nanoparticles (using ethanol & DI water) then again I should try ?
Washed well, but it is not known how you obtained the nanoparticles and the composite.
Both, Iron and gold nanoparticles are synthesized using plant and the composite is formed as gold NPs shells on prepared iron oxide nanoparticles.
Synthesis of nanoparticles using plant extracts from the point of view of a chemist is a "dirty" synthesis. In the extract of a huge number of molecules of different structure. Even after cleaning, substances covalently bound to nanoparticles will remain on the surface. You need pure synthesis of magnetite nanoparticles and gold.
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