Highly sensitive and stable SERS probes of alternately deposited Ag and Au layers on 3D SiO<sub>2</sub> nanogrids for detection of trace mercury ions<xref rid="cpb_27_7_077406fn1" ref-type="fn">*</xref><fn id="cpb_27_7_077406fn1"> <label>*</label><p>Project supported by the National Key Research and Development Program of China (Grant No. 2017YFA0207104), the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDA09040101), the National Natural Science Foundation of China (Grant No. Y6061111JJ), the Youth Innovation Promotion Association of Chinese Academy of Sciences (Grant No. 2015030), and the Key Technology Talent Program of Chinese Academy of Sciences (Grant Nos. Y8482911ZX and Y7602921ZX).</p></fn>

Highly sensitive and stable SERS probes of alternately deposited Ag and Au layers on 3D SiO₂ nanogrids for detection of trace mercury ions* *

Project supported by the National Key Research and Development Program of China (Grant No. 2017YFA0207104), the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDA09040101), the National Natural Science Foundation of China (Grant No. Y6061111JJ), the Youth Innovation Promotion Association of Chinese Academy of Sciences (Grant No. 2015030), and the Key Technology Talent Program of Chinese Academy of Sciences (Grant Nos. Y8482911ZX and Y7602921ZX).

Tian Yi^{1, 2}, Wang Han-Fu¹, Yan Lan-Qin¹, Zhang Xian-Feng¹, Falak Attia^{1, 2}, Chen Pei-Pei^{1, 2, †}, Dong Feng-Liang^{1, ‡}, Sun Lian-Feng^{1, 2, §}, Chu Wei-Guo^{1, 2, ¶}

(color online) (a) Changes of experimental SERS intensities of hexagonal Ag–Au/198 nm SiO₂ nanogrids with different thickness ratios of Ag and Au against grid length for 514 nm laser. (b) Changes of their corresponding normalized SERS intensities.