About the Authors

Wan Aminah Wan Hassan
Ian Hamerton
Brendan J. Howlin

b.howlin@surrey.ac.uk

Affiliation Department of Chemistry, University of Surrey, Guildford, Surrey, United Kingdom

Competing Interests

Huntsman Advanced Materials provided one year's studentship funding to WAWH; the other two year's funding was provided by the Malaysian Government (MARA). The work presented here was not funded or influenced by Huntsman in any way and does not form part of their sponsorship. Hence this does not alter the authors' adherence to all PLOS One policies on sharing data and materials.

Author Contributions

Conceived and designed the experiments: BJH IH. Performed the experiments: WAWH. Analyzed the data: WAWH BJH IH. Contributed reagents/materials/analysis tools: BJH. Wrote the paper: BJH IH.