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Gold (III) nitrate (Au(NO3)3) is a yellow-colored chemical compound. It has a molecular weight of 382.9 8 point. Nitrate salts are not toxic, but may be irritating to the skin or respiratory tract. Typical decomposition reactions include chemical dissociation and reduction.

In this study, a new Au(NO3)3 precursor was prepared. The precursor was used as a stabilizer for aerosol droplets for a continuous USP synthesis of AuNPs. The precursor was analyzed for chemical solubility in water-based solution and in the reaction zone.

Au(NO3)3 was tested for its chemical reactivity in high and low temperatures. A Fungilab Smart Series Rheometer was used to measure the viscosity of the Au(NO3)3 precursor. The temperature range of the reaction zone was 50 to 60 degC, with a maximum of 70 degC.

The precursor was then kept at room temperature for one month. The concentration of Au increased to 2.5 g L-1. Then, the solution was neutralized to the final concentration of Au.

For a better understanding of the formation process, the interaction of the AuNPs with the electron beam was studied. TEM analysis showed the presence of a hollow center in the particles. X-ray spectroscopy revealed a lower Au signal at the center. Similarly, the DLS measurement showed that the grouped size distributions were in accordance with the characteristic lattice distances of Au.

Moreover, in situ formation of NO3- and NO2- ions played an important role in the stabilization of the AuNPs in deionized water. This prevented the coagulation of the AuNPs.

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