Preparation of silver colloid by hydrochlorinated hydroxy amine method and its surface enhanced Raman substrate

A new method hydrochlorinated hydroxy amine method for preparing silver colloid was reported, and the formation process of silver nanoparticles was studied by UV-Vis spectroscopy and TEM. From the results, we can see the particle formation process is as follows: small particles were formed at the beginning of the reaction, and then they aggregate to large ones rapidly, then the large particles decomposed to small ones gradually. The TEM images showed directly the same process as the results from the UV-Vis spectra, indicating that the particle size distribution became more and more uniform. In addition, we transferred the Ag nanoparticles to the glass slide by electrostatic interaction to produce SERS-active substrates. Strong SERS signals can be obtained on such substrates.