Polydopamine induced in-situ growth of Au nanoparticles on reduced graphene oxide as an efficient biosensing platform for ultrasensitive detection of bisphenol A

Integrated Heterostructure of PDA/Bi‐AgIn5S8/TiO2 for Photoelectrochemical Hydrogen Production: Understanding the Synergistic Effect of Multilayer Structure

“…In contrast with TiO 2 , the absorption range of Bi‐AgIn 5 S 8 /TiO 2 can cover from 200 to 800 nm, which is agree well with the reported bandgap of Bi‐AgIn 5 S 8 /TiO 2 . The bandgaps of 0.03Bi‐AgIn 5 S 8 and 3/PDA/0.03Bi‐AgIn 5 S 8 are 1.96 and 1.89 eV (Figure S5, Supporting Information), respectively, suggesting that the PDA makes the bandgaps narrower and increases the absorption range, mainly due to the electron transfer between HOMO and LUMO of PDA, and the delocalized π‐orbit makes PDA as an excellent photosensitizer in this system . Therefore, the function of PDA here can be further defined as both passivation layer and visible light photosensitizer.…”

“…PDA belongs to organic material, so FTIR spectra (Figure b) for the heterostructure were measured to detect the existence of PDA. The IR spectrum of Bi‐AgIn 5 S 8 /TiO 2 showed two bands around 1390 and 1620 cm −1 , which were attributed to the presence of physically adsorbed water molecules and hydroxyl groups . In the spectrum of PDA/Bi‐AgIn 5 S 8 /TiO 2 , three new peaks appears at 2930, 2840, and 1114 cm −1 can be attributed to CH (stretching), aliphatic CH, and CO, respectively .…”

Sensitive Voltammetric Determination of Bisphenol A Based on a Glassy Carbon Electrode Modified with Copper Oxide‐Zinc Oxide Decorated on Graphene Oxide

“…After the addition of 0.1 mmol L À1 BPA in the cell, a well-defined oxidation peak at bare GCE, GO/ GCE, CuÀGO/GCE, ZnÀGO/GCE, CuÀZn/GO/GCE and CuÀZn/GCE (located at about 0.62 V, 0.55 V, 0.56 V, 0.58 V, 0.57 V and 0.53 V, respectively) was observed during the anodic sweep demonstrating a typical irreversible electrode reaction of BPA at the all electrodes ( Figure 4B). This irreversible oxidation reaction is in accordance with previous reports [9,[11][12][13]. Since the weak adsorption of BPA to the bare GCE surface leads to slow electron transfer, the oxidation signal of BPA on the bare GCE surface is poor ( Figure 4B-a or inset).…”

“…- [13] Carbon nanotube/ionic liquid/titania/Nafion DPV 1.0 3 10 À9 -1.0 3 10 À5 5.0 3 10 À10 Food package, water bottles [14] AuPdNPs/GNs DPV 5.0 3 10 À8 -1.0 3 10 À5 8.0 3 10 À9 Food package [9] MWCNTs/PCV/GCE DPV 5.0 3 10 À8 -1.0 3 10 À4 1.0 3 10 À8 Plastic samples [21] Au@PDA/RGO DPV 1.25 3 10 À8 -3.68 3 10 À6 1.0 3 10 À10 Plastic products [12] AuNPs-rGO-MWCNTs/ GCE DPV 5.0 3 10 À9 -1.0 3 10 À7 1.0 3 10 À7 -2.0 3 10 À5 1.0 3 10 À9 River water, shopping receipt samples [11] GOÀCNTs/Fe 3 O 4 /PGA/ GCE DPV 3.0 3 10 À9 -2.0 3 10 À7 2.0 3 10 À7 -3.0 3 10 À5 1.0 3 10 À9 Mineral water bottles, PVC food packeges [17] Poly(CTAB)/MWCNTs/PG SWV 2.0 3 10 À9 -8.0 3 10 À7 1.34 3 10 À10 Plastic drinking bottle [3] Ti/TiO 2 /MIFs CA 4.4 3 10 À9 -1.3 3 10 À4 1.3 3 10 À9 Seawater, paper cup samples [24] CuÀZn/GO/GCE SWV 3.0 3 10 À9 -1. 0 3 10 À7 3.5 3 10 À7 -2.0 3 10 À5 8.8 3 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58…”

“…Although chromatographic and spectroscopic techniques are very sensitive and selective, these techniques include time-consuming extraction and sample clean-up steps, as well as require sophisticated and expensive devices. The bare electrode surface can be modified with various materials including carbonaceous material: graphene derivatives (graphene, graphene oxide (GO), reduced graphene oxide) [9,[11][12][13], carbon nanotubes (CNT) [3,[14][15][16], metal-metal oxide based composites [17][18][19][20], conductive polymers [21,22], ionic liquids [23], molecularly imprinted polymers [24], etc. Despite all these advantages, one of the obstacles in voltammetric BPA determination is the relatively high oxidation potential of BPA with poor reproducibility and sensitivity at traditional working electrodes.…”