Platinum nanozyme catalyzed multichannel colorimetric sensor array for identification and detection of pesticides

Electroactive and SERS-Active Ag@Cu2O NP-Programed Aptasensor for Dual-Mode Detection of Tetrodotoxin

“…The LOD were 42.8 pg/mL ( I –0.13V ), 37.8 pg/mL ( I 0.17V ), and 31.6 pg/mL ( I –0.13V + I 0.17V ), at a signal-to-noise ratio of 3:1. Therefore, I –0.13V + I 0.17V obtained the best linearity and highest sensitivity as a quantitative parameter, demonstrating the advantages of the two-peak-engineered electrochemical method compared to those of the single-peak strategy . Meanwhile, as displayed in Figure d, in the presence of 10 pg/mL to 10 μg/mL TTX, the peak intensity at 1078 cm –1 showed a dramatic decrease, while the peak intensity at 730 cm –1 was relatively weak and maintained a steady level (Figure e).…”

“…Therefore, I −0.13V + I 0.17V obtained the best linearity and highest sensitivity as a quantitative parameter, demonstrating the advantages of the two-peak-engineered electrochemical method compared to those of the single-peak strategy. 41 Meanwhile, as displayed in Figure 5d, in the presence of 10 pg/mL to 10 μg/mL TTX, the peak intensity at 1078 cm −1 showed a dramatic decrease, while the peak intensity at 730 cm −1 was relatively weak and maintained a steady level (Figure 5e). Without any internal reference, the coefficient (R 2 ) of the proposed SERS platform was 0.9876 (Figure 5f).…”

Recent advances in colorimetric sensors based on nanozymes with peroxidase-like activity

“…[16][17][18] Various nanozymes have extremely broad application prospects in the fields of biosensing, immunoassay, and disease diagnosis. [19][20][21] Very recently, nanozyme-based sensors have been widely applied in electrochemical, [22][23][24] chemiluminescence, [25][26][27] luminescence, [28][29][30] and colorimetric [31][32][33] detection. Compared with other sensors, colorimetric sensors based on color change analysis can directly or indirectly achieve qualitative and quantitative detection of the target causing color change that is visible through naked eye observation 34,35 or smartphone color readout device.…”

Spherical Hydrogel Sensor Based on PB@Fe-COF@Au Nanoparticles with Triplet Peroxidase-like Activity and Multiple Capture Sites for Effective Detection of Organophosphorus Pesticides

“…Therefore, colorimetric strategies based on nanozymes are considered to be potential solutions to improve sensitivity . In addition, artificial nanozymes with similar structures and functions to natural enzymes are superior to the latter in terms of cheap, high operational stability and durability. − Chu, Kushwaha, and Li et al have synthesized graphene oxides, Ag 3 PO 4 nanoparticles, and platinum nanoparticles as nanozymes to construct effective colorimetric sensing platforms for pesticides. − However, the nanozyme sensors often suffer from weaknesses of (i) low catalytic activity, (ii) long response time, and (iii) insufficient selectivity, making these sensors susceptible in on-site testing . The disadvantages are mainly attributed to the fact that (i) the nanozyme has only one type of catalytic site and (ii) the weak interaction between the target and nanozyme.…”