Electrochemical Amplification in Side-by-Side Attoliter Nanogap Transducers | Zendy

Hamid Reza Zafarani | Zendy; Klaus Mathwig | Zendy; Ernst J. R. Sudhölter | Zendy; Liza Rassaei | Zendy

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Electrochemical Amplification in Side-by-Side Attoliter Nanogap Transducers

Author(s) -

Hamid Reza Zafarani,

Klaus Mathwig,

Ernst J. R. Sudhölter,

Liza Rassaei

Publication year - 2017

Publication title -

acs sensors

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.055

H-Index - 57

ISSN - 2379-3694

DOI - 10.1021/acssensors.7b00180

Subject(s) - transducer , materials science , cyclic voltammetry , electrode , signal (programming language) , lithography , fabrication , nanotechnology , analyte , optoelectronics , electron beam lithography , electrochemistry , resist , chemistry , acoustics , computer science , physics , medicine , alternative medicine , pathology , layer (electronics) , programming language

We report a strategy for the fabrication of a new type of electrochemical nanogap transducer. These nanogap devices are based on signal amplification by redox cycling. Using two steps of electron-beam lithography, vertical gold electrodes are fabricated side by side at a 70 nm distance encompassing a 20 attoliter open nanogap volume. We demonstrate a current amplification factor of 2.5 as well as the possibility to detect the signal of only 60 analyte molecules occupying the detection volume. Experimental voltammetry results are compared to calculations from finite element analysis.

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