Gold nanoparticles promote amorphous carbon to be ammonia gas sensor Hua-Shu Hsu, Shin-Pon Ju, Shih-Jye Sun, Hsiung Chou and C. H. Chia EPL, 114 4 (2016) 40001 Published online: 01 June 2016 DOI: 10.1209/0295-5075/114/40001