Issue 11, 2012
From the journal:

Journal of Materials Chemistry

Layer-by-layer assembled enzyme multilayers with adjustable memory performance and low power consumption via molecular-level control†

Hyunhee Baek,‡a   Chanwoo Lee,‡b   Jeongju Park,‡b   Younghoon Kim,a   Bonkee Koo,a   Hyunjung Shin,b   Dayang Wangc  and  Jinhan Cho*a  

* Corresponding authors

a Department of Chemical and Biological Engineering, Korea University, Anam-dong, Seongbuk-gu, Seoul, Korea
E-mail: jinhan71@korea.ac.kr
Fax: +82 2 926 6102
Tel: +82 2 3290 4852

b School of Advanced Materials Engineering, Kookmin University, Jeongneung-dong, Seongbuk-gu, Seoul, Korea

c Ian Wark Research Institute, University of South Australia, Adelaide, Australia

Abstract

Electrochemical properties of enzymes are of fundamental and practical importance in bio-electrochemical applications. These redox properties, which can cause the reversible changes in the current according to their redox reactions in solution, often depend on the chemical activity of transition metal ions as cofactors within the active sites of enzymes. Here, we demonstrate that the reversible resistance changes in enzyme-based multilayer films can be caused by the externally applied voltage as a result of charge trap/release of haem FeIII/FeII redox couples in dry form. It is also demonstrated that the electrically bistable switching properties of redox enzymes can be applied to nonvolatile memory devices requiring low power consumption. For this study, cationic poly(allylamine hydrochloride) (PAH) was alternately layer-by-layer assembled with anionic catalase enzyme onto Pt-coated substrates until the desired number of layers was deposited. A top electrode was deposited onto (PAH/catalase)n multilayer films to complete device fabrication. When an external bias was applied to the devices, a switching phenomenon depending on the voltage polarity (i.e., bipolar switching) was observed at low operating voltages (RESET at 1.8 V and SET voltage at −1.5 V), fast switching speed at the nanosecond level, and an ON/OFF current ratio of ∼102. In the case of inserting insulating layers of about 2 nm thickness between adjacent catalase (CAT) layers, these devices exhibited the higher memory performance (ON/OFF current ratio of ∼106) and the lower power consumption than those of (PAH/CAT)15 multilayer devices.

Graphical abstract: Layer-by-layer assembled enzyme multilayers with adjustable memory performance and low power consumption via molecular-level control

About
Cited by
Related
Download options Please wait...

Supplementary files

Article information

DOI
https://doi.org/10.1039/C2JM16231H
Article type
Paper
Submitted
29 Nov 2011
Accepted
04 Jan 2012
First published
06 Feb 2012

J. Mater. Chem., 2012,22, 4645-4651

Permissions

Request permissions

Layer-by-layer assembled enzyme multilayers with adjustable memory performance and low power consumption via molecular-level control

H. Baek, C. Lee, J. Park, Y. Kim, B. Koo, H. Shin, D. Wang and J. Cho, J. Mater. Chem., 2012, 22, 4645 DOI: 10.1039/C2JM16231H

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Spotlight

Advertisements