Recently, colorimetric assay based on metal nanoparticles have attracted increasing
attention because of their simplicity, outstandingly prompt measurement, high sensitivity, and
adequate miniaturization of the sensing devices. Among colorimetric sensors, silver
nanoparticles (AgNPs) have been used as an alternative yet promising colorimetric sensor
because it is low-priced material with higher extinction coefficients (approximately 100 fold)
compared with gold nanoparticles (AuNPs). Therefore, the use of AgNPs might lead to improve the optical sensitivity using conventional absorbance measurement [10].
Furthermore, AgNPs have various shapes such as nanospherical, nanoplate, and nanorod
depending on their synthesis via seed-mediated method and using different stabilizers [11].
Being distinguished from other AgNPs, silver nanoplates (AgNPls), which is a kind of
AgNPs with platelet configuration, exhibit broader range of absorption and scattering
properties in both visible and near-IR regions of the spectrum which can improve the optical
properties of AgNPs and enhance its sensitivity as a sensor [12].