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The two-step method, which includes the sol-gel process and ammoniation in high temperature, is used to synthesize GaN nanomaterials on Si (111) substrate. Ga(NO3)3 was used as gallium source, citric acid as the chelating agent and nickel nitrate as catalyst. After the sol can be formed by mixing ethanol solutions of Ga(NO3)3 and citric acid, the precursor films were coated on Si slices with or without...