Onsite-detection of barium and nickel from river, pond and tap water samples using gold nanoparticles as a chemical sensor

A Sensitive Colorimetric Determination of Metformin Based on Gold Nanoparticles Aggregation in Salt Solution

“…The special color of these AuNPs is due to the different absorption bands of Au local surface plasmon resonance (LSPR). When AuNPs aggregate, the inters particle distance between AuNPs is shortened, leading to color change and band shift of LSPR [7] . The aggregation phenomenon is usually caused by molecule interactions and/or chemical reactions.…”

“…The aggregation phenomenon is usually caused by molecule interactions and/or chemical reactions. Using this colorimetric principle, a variety of drugs, metal ions and other analytes have been detected [6–8] . However, LSPR biosensors have exposed some shortcomings, such as small resonance peak (valley) shift, insufficient resonance strength, wide linewidth characteristics, small peak‐to‐valley ratio, and so on, [9] which limit its application in high precision detection of the biochemical anlaysis.…”

“…When AuNPs aggregate, the inters particle distance between AuNPs is shortened, leading to color change and band shift of LSPR. [7] The aggregation phenomenon is usually caused by molecule interactions and/or chemical reactions. Using this colorimetric principle, a variety of drugs, metal ions and other analytes have been detected.…”

Green-synthesized Silver Nanoparticles as Sensor Probes for the Naked-eye Detection of Hydrogen Peroxide

“…Due to this phenomenon, AgNPs exhibit color change that is dependent on its size and morphology, thus, AgNPs have been developed as a promising sensor probe for the detection of different molecules from various matrices facilitating the detection of a target with the naked eye 3 . AgNPs have been used recently for the detection of Hg(II) and Fe(II) 4 , ammonia 5 , Ba(II) and Ni(II) 6 , endrin 7 and triethylamine 8 . Compared to the gold precursor, the precursor for AgNPs has lower cost, and AgNPs are easier to synthesize 9 .…”

Experimental and theoretical approaches for the selective detection of thymine in real samples using gold nanoparticles as a biochemical sensor

“…[15][16][17][18] Recently, interest in colorimetric sensors has expanded because of their potential to detect target analytes in sample solutions. In this context, we have demonstrated the use of AgNPs and AuNPs for the colorimetric sensing of pesticides, 19,20 cationic surfactants, 21 metal ions [22][23][24] and drugs 25 from biological, environmental and food samples. In addition, the interaction of noble metal NPs with oligonucleotides and their building substances such as nucleobases and nucleosides has been reported in the literature.…”