High loading of uniformly dispersed Pt nanoparticles on polydopamine coated carbon nanotubes and its application in simultaneous determination of dopamine and uric acid

Abstract

Multiwalled carbon nanotubes (MWCNT) were homogeneously covered with a bio-functional polydopamine (PDOP) by a simple dip-coating approach in mild basic solution. Then, uniformly dispersed and highly loaded platinum nanoparticles (PtNPs) were deposited on MWCNT@PDOP by a mild reductant, and were characterized by transmission electron microscopy and x-ray photoelectron spectroscopy. Afterwards, this nanocomposite was modified on the glass carbon electrode and applied to simultaneously determine dopamine (DA) and uric acid (UA) by differential pulse voltammetry (DPV). Results showed that a linear electro-oxidation response was found for DA and UA in the range of 0.25-20 μM and 0.3-13 μM with the detection limit (S/N = 3) of 0.08 μM and 0.12 μM, respectively. In addition, the detection sensitivities for DA and UA by DPV were 1.03 μA μM(-1) and 2.09 μA μM(-1), respectively, which were much higher than those from a cyclic voltammogram. Finally, the reproducibility and stability of the nanocomposite were also evaluated, demonstrating that such MWCNT@PDOP@PtNPs can be a promising candidate for advanced electrode material in electrochemical sensing and other electrocatalytic applications.

Facile synthesis of zeolite FAU molecular sieve membranes on bio-adhesive polydopamine modified Al2O3 tubes

“…Moreover, compared with the FT-IR spectrum of non-modified α-Al 2 O 3 , the FT-IR spectrum of PDA-modified α-Al 2 O 3 contains remarkable bands at 1058, 1274, 1510, 2938 cm À 1 , which match well with the FTIR spectrum of PDA [46,47]. The band at 1058 cm À 1 can be assigned to C-O stretching vibrations of carbonyl groups, and the band at 1274 cm À 1 indicates C-OH stretching vibrations [48,49]. The band shown at 1510 cm À 1 is related to N-H vibration.…”

Potential and performance of a polydopamine-coated multiwalled carbon nanotube/polysulfone nanocomposite membrane for ultrafiltration application

“…Furthermore, similar with absorbance in water (Figure 5 a), Pdop-MWNT showed higher absorbance compared to pristine MWNT [7,48] in NMP solvent (Figure 5b). The peak at 270 nm pointed out the existence of Pdop on the MWNT surface [7,26,46,49,50,51]. Based on the explanation above, it is predicted that the Pdop-MWNTs would obtain fine dispersion in NMP solvent.…”

Highly controlled coating of biomimetic polydopamine in TiO2 nanotubes

“…PDA coatings are most of the time performed using the procedure developed by Lee et al [12] in which, dopamine spontaneously polymerizes at a slightly basic pH, which leads to the coating of the immersed surfaces with PDA [13,14]. Among others, it has been applied for sensing, [15][16][17][18] for the passive dispensing of aqueous solutions, [19] for making graphitic transparent stretchable electrodes, [20] and it can moreover be used as a platform for the decoration of surfaces with NPs [21][22][23][24][25][26]. Nam et al previously described the sensitizing of TiO 2 NPs with PDA and used this phenomenon for fabricating DSSCs, [27] but so far no research has been done on anodized TiO 2 NTs coated with PDA.…”