Electrochemical Sensing of 1-Naphthylamine Based on Multiwalled Carbon Nanotubes@graphene Oxide Nanoribbons Core-shell Heterostructure†

doi:10.7503/cjcu20150343

Abstract

Abstract:

A novel core-shell heterostructure with multiwalled carbon nanotubes(MWCNTs) as the core and graphene oxide nanoribbons as the shell(MWCNTs@GONRs) was prepared from longitudinal partially unzipping of MWCNTs and applied in electrochemical sensing of 1-naphthylamine(1-NA). Scanning electron microscopy, transmission electron microscopy, Fourier transform infrared spectroscopy and thermogravimetric analysis were used to characterize the morphology and structures of MWCNTs@GONRs. Owing to the synergistic effects from MWCNTs and GONRs, the oxidation peak current of 1-NA at the MWCNTs@GONRs modified glassy carbon electrode(GCE) are much higher than those at the MWCNTs/GCE and bare GCE, and the MWCNTs@GONRs/GCE has a linear response range of 8.0—400.0 nmol/L with a detection limit of 2.5 nmol/L for 1-NA determination.

Key words: Graphene nanoribbons, 1-Naphthylamine, Electrochemical sensing, Carbon nanotubes, Core-shell heterostructure(Ed.: N,K)

CLC Number:

O656.3

TrendMD:

ZHU Gangbing, PEI Yuanpeng, CHEN Yuxuan, YI Yinhui, SUN Heng, WU Xiangyang. Electrochemical Sensing of 1-Naphthylamine Based on Multiwalled Carbon Nanotubes@graphene Oxide Nanoribbons Core-shell Heterostructure^†[J]. Chem. J. Chinese Universities, 2015, 36(10): 1888.

Figures/Tables 9

Scheme 1 Procedure for the preparation of MWCNTs@GONRs and detecting 1-NA electrochemically

Fig.1 Proposed chemical mechanism of MWCNTs unzipping

Fig.2 SEM(A, B) and TEM(C, D) images of MWCNTs(A, C) and MWCNTs@GONRs(B, D)

Fig.3 FTIR spectra(A), TGA curves(B) and Raman spectra(C) of MWCNTs(a) and MWCNTs@GONRs(b)

Fig.4 CV responses of 20 μmol/L 1-NA(A, scan rate: 50 mV/s) and DPV responses of 100.0 nmol/L 1-NA(B) at GCE(a), MWCNTs/GCE(b) and MWCNTs@GONRs/GCE(c) in PBS solution(pH=7.0)

Fig.5 Effects of the amount of MWCNTs@GONRs(A) and the accumulation time(B) on the DPV peak currents of 80.0 nmol/L 1-NA at the MWCNTs@GONRs/GCE

Fig.6 DPV responses at the MWCNTs@GONRs/GCE in PBS containing different concentrations of 1-NA(A) and the calibration curve of 1-NA(B) Concentration of 1-NA/(nmol·L-1): a—f. 8.0; 50.0; 100.0; 180.0; 280.0; 400.0.

Table 1 Comparison of different modified electrodes for the detection of 1-NA

Electrode	Detection limit/(nmol·L^-1)	Linear range/(nmol·L^-1)	Reference
Carbon paste electrode	130	10—100000	[18]
Boron doped diamond electrode	70	200—10000	[19]
MWCNTs@GONRs/GCE	2.5	8—400	This work

Table 2 Determination of 1-NA in water samples

Sample	Added/(nmol·L^-1)	Found/(nmol·L^-1)	Recovery(%)
a	10.0	9.6	96.0
b	50.0	49.2	98.4
c	150.0	143.8	95.8
d	300.0	293.5	97.8

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