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. 2020 Jan 25;10(2):209. doi: 10.3390/nano10020209

Figure 2.

Figure 2

Label-free AuNRs sensor array for colorimetric detection of biothiols. Reproduced with permission from [47]. (a) Synthesis of various AuNRs; (b) Fingerprint-like colorimetric array for metal ions; (c) Principal component analysis. Copyright Talanta, 2019.