Naked-eye colorimetric detection of Cu2+ and Ag+ ions based on close-packed aggregation of pyridines-functionalized gold nanoparticles

One-pot Preparation of Creatinine-functionalized Gold Nanoparticles for Colorimetric Detection of Silver Ions

“…The limit of detection was calculated to be 1.0 μM based on a signal-to-noise ratio of 3. This sensitivity was comparable or higher than those of colorimetric assays based on AuNP-based chromogenic reaction (1.0 μM) [17] and pyridine-functionalized AuNPs (1 mM) [8].…”

“…In particular, functionalized gold nanoparticles (AuNPs) have become emerging material for the detection of Ag + due to their high extinction coefficient and distance-dependent optical properties. To date, cytosine-(C)-rich oligonucleotide, Tween-20, pyridines, and ionophore-functionalized AuNPs have been reported for the detection of Ag + [6][7][8][9]. However, these functionalized AuNPs suffer from low water solubility, multistep organic synthesis, high cost, and unstable structure.…”

Recent Advances and Perspective on Design and Synthesis of Electrode Materials for Electrochemical Sensing of Heavy Metals

“…Metal nanoparticles and metal oxide‐based electrodes have been the subject of recent researches due to their specific physicochemical properties of enhanced diffusion of electroactive species, improved selectivity, catalytic activity, and higher signal‐to‐noise ratio, where cuprous oxide and bimetallic nanoparticles (iron with palladium, gold, silver, and platinum) were used ubiquitously. Nanomaterials based on gold nanoparticles have been tremendously used for the sensitive electrochemical determination of heavy metals . The determination of mercury with a detection limit of 80 p m and wide linear range of 0.4–4 n m has been realized with Au NPs as functional material on GC substrate .…”

Portable Nanoparticle-Based Sensors for Food Safety Assessment

“…The system provided detection limits of 30 ppb for Pb 2+ and 89 ppb for Al 3+ . AuNPs based colorimetric detection was also demonstrated for Hg 2+ [ 131 , 132 , 133 , 134 , 135 ], Cu 2+ and Ag + [ 136 ], Mn 2+ [ 137 ], Cd 2+ [ 138 ], Fe 3+ , Pb 2+ , Al 3+ , Cu 2+ , and Cr 3+ [ 135 ]. Baxter et al proposed a simple and economical process for fabricating gold electrodes by applying sintered AuNPs stabilised with 4-(dimethylamino)pyridine to filter paper and used this platform to detect Cu ions [ 93 ].…”