One-step Method for Fabrication of Closed Wireless Nanopore Electrode and Its Application on Single Nanoparticle Detection †

doi:10.7503/cjcu20190339

Abstract

Abstract:

We developed a one-step method based on the chemical reduction of HAuCl₄ to fabricate a closed wireless nanoelectrode(CWNE) which provides a high reproducibility in both electrode size and signal-to-noise ratio. By studing the reactant concentration, the successful ratio for fabricating 30 nm CWNE is increased to 85.7% and RMS noise value is decreased to 4.2 pA. Furthermore, the CWNE was applied in the single nanoparticle collision detection which shows a high current resolution at picoampere level and a high temporal resolution at microsecond level. Therefore, the CWNE could be further benefit to achieve the accurate nano-electrochemical measurements.

Key words: Wireless nanopore electrode, Electrochemically confined effect, Nano-electrochemistry, Single entity electrochemistry

CLC Number:

O657.1

TrendMD:

XU Suwen,YING Yilun,LONG Yitao. One-step Method for Fabrication of Closed Wireless Nanopore Electrode and Its Application on Single Nanoparticle Detection ^†[J]. Chem. J. Chinese Universities, 2019, 40(10): 2075.

Figures/Tables 4

Fig.1 Scheme of the fabrication of closed wireless nanopore electrode(CWNE)(A), SEM images of a bare quartz nanopore with a diameter of 30 nm(from top view)(B) and CWNE with a diameter of 30 nm(from top view)(C) The sprayed Pt is deposited on the outer wall of nanopipette for a clear SEM image.

Sample No.	1	2	3	4	5
c(HAuCl₄)/(mmol·L^-1)	1	10	10	20	20
c(NaBH₄)/(mmol·L^-1)	5	5	10	10	20

Fig.2 Fabrication characterization of CWNEs Monitoring the growth process of samples 1(A), 4(B) and 5(C) by I-t current trace; (D) I-V curves of CWNEs after fabrication; (E) successful ratio for samples 1—5, respectively.

Fig.3 Current response of 30 nm CWNE in the absence/presence of AuNPs The pentagram denotes the typical spike signals shown in the right.

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