[1] [1] Amanda J. Haes and Richard P. Van Duyne, Anal. Bioanal. Chem. 379, 920 (2004).

[2] [2] Laura B Sagle, Laura K Ruvuna, Julia A Ruemmele and Richard P Van Duyne, Nanomedicine 8, 1447 (2011).

[3] [3] Nath. N and Chilkoti. A, Anal. Chem. 74, 504 (2002).

[4] [4] Lee. S, Mayer. K. M and Hafner. J. H, Anal. Chem. 81, 4450 (2009).

[5] [5] Hsing-Ying Lin, Chen-Han Huang and Lai-Kwan Chau, Biosensors and Bioelectronics 51, 371 (2014).

[6] [6] Jiangping Chen, Se Shi and Zhimin He, Sensors 15, 12205 (2015).

[7] [7] M.H. Tu, T. Sun and K.T.V. Grattan, Sensors and Actuators B 191, 37 (2014).

[8] [8] Beniamino Sciacca and Tanya M. Monro, Langmuir 30, 946 (2014).

[9] [9] Jie Cao, Minh Hieu Tu, Tong Sun and Kenneth T.V. Grattan, Sensors and Actuators B 181, 611 (2013).

[10] [10] Ming-jie Yin, Chuang Wu and Hwa-yaw Tam, Analyst. 138, 1988 (2013).