File Name : figure s1.tif

Caption : (a) tem image and (b) size distribution histogram of aunps.

File Name : figure s2.tif

Caption : uv-vis spectrum of aunps solution.

File Name : figure s3.tif

Caption : two-dimensional afm images of (a) gf and (b) gf-aunp. insets are three-dimensional afm images of (a) gf and (b) gf-aunp.

File Name : figure s4.tif

Caption : stability testing of the sensing system.