Abstract
Stable gold nanoparticle (AuNP) colloids were synthesized in a class ofquaternary ammonium-based room-temperature ionic liquids (QAILs),[Me3NC2H4OH] + [ZnnCl2n + 1] − (n = 1 or 2), by heatingin air at 135–145 °C. The QAIL was employed as a solvent, a reducing agent, and as a stabilizer.The size of the QAIL–AuNPs can be varied between 20 and 40 nm bychanging the reaction temperature. A symproportionation reaction wasemployed to further decrease the size of the AuNPs by the addition ofAu3 + ions. The surface covering of QAIL on the AuNPs had a significant impact on their surfaceplasmon resonance (SPR), which was red-shifted. The AuNPs synthesized by this simpleand environmentally friendly reaction can be realized in several minutes and also exhibithigh stability and good reproducibility, providing a new facile approach to metalnanoparticle preparation.
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