S-termination effects for the catalytic activities of Pd on GaN(0 0 0 1) surfaces

A S-terminated GaN(0 0 0 1) substrate covered with catalytically active Pd nanoparticles (PdNP) serves as a treatable and green chemical catalyst for various cross-coupling reactions. The role of S in the formation of PdNP has been studied so far, but the effect on the catalytic activity has not been investigated. In this study, we investigate the role of S-termination during the Mizoroki-Heck reaction from the view point of the stability of PdNP and the yield in repeated reactions. PdNP are formed on both S-terminated GaN(0 0 0 1) surface and non-terminated one, and their catalytic activities are compared when the quantity of PdNP is subminimal and excessive. It is found that S-termination serves as a binder of PdNP on GaN(0 0 0 1) surface, resulting in the self-regulation of PdNP leaching.

► A new application of S-terminated GaN surface, that is, palladium nanoparticles (PdNP) are deposited on the surface. ► The structure serves as a treatable and green chemical catalyst. ► The catalysts with or without S-termination are prepared to discuss the role of S termination in the fascinating catalytic activity. ► The catalytic activities of the samples are discussed by using the chemical conversions of repeated Mizoroki-Heck reactions. ► It was concluded that the S-termination acts as a stabilizing binder of PdNP on the surface.