Gold Nanoparticles as Exquisite Colorimetric Transducers for Water Pollutant Detection

Abstract

Gold nanoparticles (AuNPs) are useful nanomaterials as transducers for colorimetric sensors because of their high extinction coefficient and ability to change color depending on aggregation status. Therefore, over the past few decades, AuNP-based colorimetric sensors have been widely applied in several environmental and biological applications, including the detection of water pollutants. According to various studies, water pollutants are classified into heavy metals or cationic metal ions, toxins, and pesticides. Notably, many researchers have been interested in AuNP that detect water pollutants with high sensitivity and selectivity, while offering no adverse environmental issues in terms of AuNP use. This review provides a representative overview of AuNP-based colorimetric sensors for detecting several water pollutants. In particular, we emphasize the advantages of AuNP as colorimetric transducers for water pollutant detection in terms of their low toxicity, high stability, facile processability, and unique optical properties. Next, we discuss the status quo and future prospects of AuNP-based colorimetric sensors for the detection of water pollutants. We believe that this review will promote research and development of AuNP as next-generation colorimetric transducers for water pollutant detection.

Nano Enabled Plasmonic Strips For Colorimetric Detection Of Food Adulterants

“…Figure 7 (a) depicts the FT‐IR spectrum of AuNPs, which showed intensive peaks at 3310 cm −1 and 1630 cm −1 attributed to the −O−H and −C=C stretching of hydroxyl group and carboxyl groups present in the surface of AuNPs. This peak indicates the interaction of hydroxyl groups (TA) and carboxyl groups (citrate ion) present on the surface of AuNPs [10,11] . Melamine showed an intense band at 3413 cm −1 ascribed to the presence of amine groups.…”

“…Moreover, combining various sensing techniques for analyzing the sample can afford new and precise information for specific analytes. For example, when oxidation/reduction occurs promote the changes in the chemical structure of an analyte [10] …”

“…AuNPs coated sensor strips have been developed for the detection of various targeting analytes such as nucleic acid, proteins, heavy metal ions and adulterants [5,6] . H.Hun.et.al., reported a review on AuNPs as exquisite colorimetric transducers for water pollutant detection [10] . Different AuNPs based colorimetric assay has been developed for the detection of melamine.…”

“…For example, when oxidation/reduction occurs promote the changes in the chemical structure of an analyte. [10] Numerous research groups have been focused on the development of an easy way to identify hazardous matters in food and food-related industries. Milk adulteration is one of the most common threats in the world.…”

“…[5,6] H.Hun.et.al., reported a review on AuNPs as exquisite colorimetric transducers for water pollutant detection. [10] Different AuNPs based colorimetric assay has been developed for the detection of melamine. AuNPs aggregation in the presence of melamine with cyanuric acid by triple hydrogen-bonding network was reported by Ai et al, 2008.…”