High sensitivity and a wide detection range are always the pursuit of sensor design. In this work, gold nanostars (Au NSs) featuring shape sea urchins with an absorption peak at near infrared region (822 nm) were prepared. We proposed Au NSs-based plasmonic colorimetric sensing platform for ultrasensitive catechol (CC) from 3.33 nM to 107 ?M limit (LOD) 1 nM. The target analyte, CC, was used re...