Stable and Reversible Photoluminescence from GaN Nanowires in Solution Tuning by Ionic Concentration.

ABSTRACT: We report response of photoluminescence (PL) from GaN nanowires without protection in solutions. The distinct response is not only toward pH but toward ionic concentration under same pH. The nanowires appear to be highly stable under aqueous solution with high ionic concentration and low pH value down to 1. We show that the PL has a reversible interaction with various types of acidic and salt solutions. The quantum states of nanowires are exposed to the external environment and have a direct physical interaction which depends on the anions of the acids. As the ionic concentration increases, the PL intensity goes up or down depending on the chemical species. The response results from a competition of change in surface band bending and charge transfer to redox level in solution. That of GaN

SUBMITTER: Nguyen AT 

PROVIDER: S-EPMC7952484 | biostudies-literature | 2021 Mar

REPOSITORIES: biostudies-literature