Mercury vapor sensor enhancement by nanostructured gold deposited on nickel surfaces using galvanic replacement reactions Ylias M. Sabri, a Samuel J. Ippolito* a Armand J. Atanacio b Vipul Bansal a and Suresh K Bhargava* a a Advanced Materials and Industrial Chemistry (AMIC) Group, School of Applied Sciences, RMIT University, Melbourne, Australia. b Institute of Environmental Research, Australia Nuclear Science and Technology Organisation, Lucas Heights, NSW 2234, Australia. Fax: 613 9925 3747; Tel: 613 9925 3365; E-mail: samuel.ippolito@rmit.edu.au and suresh.bhargava@rmit.edu.au Electronic Supplementary Information Electronic Supplementary Material (ESI) for Journal of Materials Chemistry This journal is © The Royal Society of Chemistry 2012