SVs-rich Fe 3 S 4 nanosheets are synthesized by adjusting ethylene glycol: water ratio. Sulfur vacancies promote the adsorption and decomposition of H 2 O 2 on Fe 3 S 4 surface. A colorimetric assay is constructed using SVs-rich Fe 3 S 4 nanosheets, TMB and glucose. SVs-rich Fe 3 S 4 nanosheets show higher peroxidase-like activity than SVs-poor Fe 3 S 4. A smartphone APP is self-designed for the colorimetric detection of serum glucose.
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