All chemicals were used as received. Benzothiadiazolyl diamine compound 1 (97%), ninhydrin compound 2 (98%), and triphenyldiamine compound 4 (97%) were obtained from Xingwei Lithium Energy Technology Co., LTD. Intermediate compounds 3 and 5, as well as NIR dyes IR806 and Cy7, were synthesized and purified with details provided in the Supplementary Information. All remaining chemicals, including tetrahydrofuran (THF, 99.9%), dichloromethane (DCM, 99.9%), chloroform (CHCl3, 99.9%) and methanol (CH3OH, 99.9%), were purchased from Sigma Aldrich.
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