Microstructure and chemical states Fig xA a TEM image

4a shows the FTIR spectra of methyl orange (curve I), In2S3 nanoparticles after mixing with MO aqueous solution (20 mg L−1) in the dark for 3 h at 30 °C (curve II), In2S3 nanoparticles after mixing with MO aqueous solution (20 mg L−1) in the dark for 3 h followed by irradiating under NIR light for 8 h (curve III) and pristine In2S3 nanoparticles (curve IV).