Depending on the bonding temperature, there were differences in the presence of pores in the Ag layer; the porosity tended to decrease with the increasing temperature. ADS  Sci. Publisher's note: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations. Adsorption of 6(b)). The diffusion of Ag ions into SiO2 without such an external driving force has not be studied in detail to our knowledge, but the formation of metallic ions would be likely to contribute to the bonding of SiO2 with metals. analysed the data. of the whole article in a thesis or dissertation. The diameter of the AgNP on SiO2 was 2 nm. Phys. Subsequently, Ag would be present over the entire grown silicon oxide layer owing to the diffusion of Ag. Ceram. 4(a,b), respectively) showed the sintered Ag adhering well to the substrates. Then, the influence of the bonding temperature on the joint strength was evaluated in addition to interfacial microstructural observations. 134, 18824–18833 (2012). When Si-materials are oxidized, the volume change ascribed to the reaction generally occurs following the Pilling-Bedworth ratio RPB defined as: where Vm and Vo are the volume of, ρm and ρo are the densities of the metal and oxide, respectively, Mo and Mm are the atomic mass numbers of the metal and oxide, respectively, and n is the number of metal atoms in the oxide molecule35. Get the most important science stories of the day, free in your inbox. Since covalent and ionic bonds are generally the principal types of chemical bonds in these semiconductors, compatibility with the metallic bonds is greatly limited. Surf. a Takata, S., Ogura, T., Ide, E., Morita, T. & Hirose, A. Thin Sol. atomistic thermodynamics The thermal stress results in the degradation of the joint strength caused by thermal shock, particularly for brittle materials such as Si and SiO2. ADS  Fetching data from CrossRef. J. The sintered Ag sufficiently adhered to the substrates with a few pores; Ag adequately bonded to Au, as observed in previous studies7,15. From adsorption at the surface to incorporation into subsurface sites: the role of steps for O/Ag. or in a thesis or dissertation provided that the correct acknowledgement is given 3 Answers. The simulated temperature and pressure were set to 500 °C and 1 atm, respectively. An exothermal DTA peak accompanied by significant weight loss in TGA was measured at 145 °C; it was reported that the redox reaction of Ag2O exhibits an exothermic reaction above 100 °C13,14. Article  PubMed Central  Article  It was reported that precipitated Ag in the SiO2 layer remains in a metallic state52, indicating that Ag is present along the Ag/SiO2 interface and able to maintain the metallic bonding state. The Au substrate was placed on the Ag2O paste layer after preheating. Nanocrystals as Stoichiometric Reagents with Unique Surface Chemistry. Trans. During the reaction between Ag2O and an organic solvent, AgNPs can be produced by two different processes; a redox reaction temporarily producing Ag ions, and thermal decomposition during heating26,27,28, which can induce the formation of Ag ions or atoms as an intermediate state. A silicon oxide (i.e. Soc. The vibrational spectra for each oxide are discussed in relation to its crystal structure, and were found to be consistent with factor group analysis predictions. The evolution of the interfacial structure was also observed as a visible colour change in the samples. AgNP can adhere to SiO2 with increasing wetting angle owing to the presence of embedded Ag atoms. Impedance Spectroscopy and Structural Studies on Silver Doped Hydroxyapatite. Accordingly, the formation of the interfacial structure below the thermal decomposition temperature would be as follows: (I) the generation of Ag ions due to the reaction between Ag2O and organic solvent, (II) adhesion of Ag ions onto native oxide, (III) diffusion of Ag ions or atoms into the native oxide with increasing temperature, and (IV) precipitation of AgNPs followed by sintering. Article  376, 52–61 (2016). Insights into the function of silver as an oxidation catalyst by There are many reports regarding the oxidation mechanism in Si-materials; the oxidation mechanism changes with the thickness of the silicon oxide layer42,43,44. A bonding method involving the sintering of Ag derived from the redox reaction between Ag2O and an organic solvent has been reported6,7: Ag nanoparticles (AgNPs) are generated during the bonding process as a result of the redox reaction. In all cases the Ref. J. Inst. Scientific Reports Thermochim. the whole article in a third party publication with the exception of reproduction Mater. Effects of Reducing Solvent on Copper, Nickel, and Aluminum Joining Using Silver Nanoparticles Derived from a Silver Oxide Paste. It was also shown that the diffusion of metallic ions into SiO2 is facilitated under an electric field24,25. Thus, the developed interfacial structure should change according to the thermal decomposition temperature. T.M., T.S. I want to write the formula for silver oxide. Use the link below to share a full-text version of this article with your friends and colleagues. Heterogene Katalysatoren – fundamental betrachtet. J. Switchable CO2 electroreduction via engineering active phases of Pd nanoparticles. Physical characteristics of heat-treated nano-silvers dispersed in sol-gel silica matrix. Zhang, R., Lin, W., Moon, K. & Wong, C. P. Fast Preparation of Printable Highly Conductive Polymer Nanocomposites by Thermal Decomposition of Silver Carboxylate and Sintering of Silver Nanoparticles.