Dear friends
I am trying to synthesize 1-2 nm gold nanoparticles synthesize. I followed below method which belong to Duff et al., but I could not gain good result. Is any mistake in my synthesis process?? I didn't heated the reaction flask. As you know in citrate reduction procedures for Gold nanoparticles synthesis it was neccessary to heat the HAuCl4 solution in reaction vessel. my followed process is as below:
THPC gold seeds (200 mL, 1–2 nm) were prepared as follows: NaOH (1.2 mL, 1 m) and aq THPC (4 mL, 6.8×10−2 m) were added to H2O (180 mL) under vigorous stirring. After 5 min, aq HAuCl4 (1.53 mL, 0.13 m) was added in one quick motion. The solution changed instantly from colorless to deep brown, was cooled to 4 °C and stored until needed (after 2–8 weeks).
Any quick helps will appreciated.
Tkanks in advance
Behzad
Green synthesis of 1–2 nm gold nanoparticles stabilized by amine-terminated ionic liquid and their electrocatalytic activity in oxygen
Green Chem., 2008,10, 907-909
DOI: 10.1039/B806453A
Испарять в потоке инертного газа
Evaporated in a stream of inert (or N2) gas.
Try with ice cold Sodium borohydrate as as reducing agent and trisodium citrate for capping.In stirring solution of chloroauric acid add sodium borohydrate.The yellow solution become dark brown. Then add trisodium citrate.continue stirring.the solution become red.No heating.for better results prepare sodium borohydrate just before experiment and keep it in freezer for 10 mins. Keep borohydrate in standard flask and keep it tightly closed. Using syringe to add NaBH4 give better results.
500 μL of 0.2 M NaOH solution was added to glass vials containing 15.16 mL of nanopure water followed by the addition of 400 μL of the reducing agent THPC (200 μL of 80% THPC added to 16.66 mL of nanopure water). Finally, 660 μL of 25 mM HAuCl4·3H2O was added to the vials with constant stirring. This will give Au NPs in the size range of 1-2 nm in diameter.
You must do a stream of evaporation of your material. I think the size of particles is depended from T and V of stream ( He, Ar and N2 ). I think the process is depended from geometry of space of stream-former also. For me it's interesting to see this process. I must mark that on my action constantly intervenes any not friendship force. I want to ask to stop this force. D.K.M.
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