A colorimetric method for highly sensitive and accurate detection of iodide by finding the critical color in a color change process using silver triangular nanoplates.

Highlights: [•] Demonstrated a new colorimetric strategy for iodide detection by silver nanoplates. [•] The colorimetric strategy is to find the critical color in a color change process. [•] The colorimetric strategy is more accurate and sensitive than common colorimetry. [•] Discovered a new morphological transformation phenomenon of silver nanoplates. [ABSTRACT FROM AUTHOR]