3 results about "Chlorauric acid" patented technology

The invention relates to a gold nanocluster with controllable luminescence color and a preparation method and application thereof. The gold nanocluster is formed by combined action of TSA, chloroauric acid and zinc ions. The gold nanocluster prepared by the invention can show different luminous colors after being heated at room temperature and high temperature, and can be used for information encryption; meanwhile, due to the high-temperature-resistant characteristic, the material can also be used as a thermal trigger mark. The preparation method of the gold nanocluster is simple and low in cost; the detection means is simple and rapid and easy to observe; and repeated use can be realized.

The application discloses a preparation method of gold powder for thick film conductive paste, and the method comprises the following steps: firstly, dissolving gold blocks in aqua regia, adding ammonium chloride, and evaporating to prepare ammonium chloraurate powder; secondly, mixing the ammonium chloraurate powder with ascorbic acid and ball milling to obtain uniformly mixed gold-containing precursor powder; thirdly, calcining the gold-containing precursor powder at low temperature in air to obtain nanometer gold powder; and fourthly, adding the nanometer gold powder into anhydrous ethanol to prepare nanometer gold suspension, and then performing high-temperature atomization to obtain spherical gold powder. By controlling the ball milling time of the ammonium chloraurate and ascorbic acid, combining with the control of low-temperature calcination parameters and the temperature of high-temperature atomization, the gold powder for thick film conductive paste is finally obtained, the addition and cleaning of a direct liquid-phase reduction gold powder dispersant are avoided, the spherical morphology and high purity of the gold powder are ensured, the gold powder is suitable for thick film conductive use, the preparation method is simple in process, high in product yield, large in output, green in environment protection, and easy for industrial production.