1. B W H Baugher, H O Churchill, Y Yang and P Jarillo-Herrero Nat. Nanotechnol. 9 262 (2014)
2. H I Karunadasa, E Montalvo, Y Sun, M Majda, J R Long and C J Chang Science 335 698 (2012)
3. D Voiry et al Nat. Mater. 12 850 (2013)
4. Q Lu, Y Yu, Q Ma, B Chen and H Zhang Adv. Mater. 28 1917 (2016)
5. D Jariwala, V K Sangwan, L J Lauhon, T J Marks and M C Hersam ACS Nano 8 1102 (2014)