Article history: Composite ﬁlms of deoxyribonucleic acid (DNA) and lead sulﬁde (PbS) nanoparticles are prepared to Received 22 June 2017 fabricate biological memory devices. A simple solution based electrografting is developed to deposit Received in revised form 21 July 2017 2 large (few cm ) uniform ﬁlms of DNA:PbS on conducting substrates. The ﬁlms are studied by X-ray Accepted 1 August 2017 photoelectron spectroscopy, ﬁeld emission SEM, FTIR and optical spectroscopy to understand their prop- Available online 5 August 2017 erties. Charge transport measurements are carried out on ITO-DNA:PbS-metal junctions by cyclic voltage scans, electrical bi-stability is observed with ON/OFF ratio more than ∼10 times with good stability and Keywords: endurance, such performance being rarely reported. The observed results are interpreted in the light of DNA strong electrostatic binding of nanoparticles and DNA stands, which leads doping of Pb atoms into DNA. Lead sulﬁde nanoparticles As a result, these devices exhibit negative differential resistance (NDR) effect due to oxidation of doped Electrografting metal atoms. These composites can be the potential materials in the development of new generation Electrical switching Non-volatile memory devices non-volatile memory devices. © 2017 Elsevier B.V. All rights reserved. 1. Introduction used for DNA sequencing, disease
Applied Surface Science – Elsevier
Published: Jan 1, 2018
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