The pH-dependent interaction of silver nanoparticles and hydrogen peroxide: A new platform for visual detection of iodide with ultra-sensitivity

► A new platform for the visual detection of iodide. ► Iodide was detected based on pH-dependent interaction of AgNPs and H2O2. ► This method was simple and fast, with good selectivity and sensitivity. ► It may innovate the field of iodide recognition.