Novel electrochemiluminescence solid-state pH sensor based on an i-motif forming sequence and rolling circle amplification

Based on a pH-dependent i-motif forming sequence and rolling circle amplification (RCA) strategy, a novel electrochemiluminescence (ECL) solid-state pH sensor was proposed herein. The sensor showed a wide dynamic response range from pH 4 to 7.4. Furthermore, our sensor could be used to determine glucose, demonstrating its practical applicability.