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

Hyunhee Baek, Chanwoo Lee, Jeongju Park, Younghoon Kim, Bonkee Koo, Hyunjung Shin, Dayang Wang, Jinhan Cho

Research output: Contribution to journalArticle

17 Citations (Scopus)

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 Fe III/Fe II 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 ∼10 2. 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 ∼10 6) and the lower power consumption than those of (PAH/CAT) 15 multilayer devices.

Original languageEnglish
Pages (from-to)4645-4651
Number of pages7
JournalJournal of Materials Chemistry
Volume22
Issue number11
DOIs
Publication statusPublished - 2012 Mar 21

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Level control
Multilayers
Electric power utilization
Enzymes
Catalase
Data storage equipment
Polycyclic aromatic hydrocarbons
Multilayer films
Electric potential
Redox reactions
Heme
Electrochemical properties
Transition metals
Metal ions
Fabrication
Electrodes
Substrates
Oxidation-Reduction

ASJC Scopus subject areas

  • Materials Chemistry
  • Chemistry(all)

Cite this

Layer-by-layer assembled enzyme multilayers with adjustable memory performance and low power consumption via molecular-level control. / Baek, Hyunhee; Lee, Chanwoo; Park, Jeongju; Kim, Younghoon; Koo, Bonkee; Shin, Hyunjung; Wang, Dayang; Cho, Jinhan.

In: Journal of Materials Chemistry, Vol. 22, No. 11, 21.03.2012, p. 4645-4651.

Research output: Contribution to journalArticle

Baek, Hyunhee ; Lee, Chanwoo ; Park, Jeongju ; Kim, Younghoon ; Koo, Bonkee ; Shin, Hyunjung ; Wang, Dayang ; Cho, Jinhan. / Layer-by-layer assembled enzyme multilayers with adjustable memory performance and low power consumption via molecular-level control. In: Journal of Materials Chemistry. 2012 ; Vol. 22, No. 11. pp. 4645-4651.
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