Search

Your search keyword '"Choi, Kyung Hyun"' showing total 692 results
Start Over Author "Choi, Kyung Hyun"
692 results on '"Choi, Kyung Hyun"'

224. Resistive switching phenomena induced by the heterostructure composite of ZnSnO3 nanocubes interspersed ZnO nanowires.

Author

Siddiqui, Ghayas Uddin, Rehman, Muhammad Muqeet, and Choi, Kyung Hyun

Abstract

The resistive switching effect of various materials has been investigated because of their promising advantages such as high scalability, low cost, simple structure and less power consumption of such memory devices. In this study, the resistive switching effect in nanocomposites of zinc oxide nanowires (ZnO NWs) and zinc stannate nanocubes (ZnSnO3 NCs) has been explored. The device was fabricated on a flexible poly(ethylene terephthalate) substrate on which highly conductive (0.3 Ω cm) patterns of silver (Ag) were deposited as bottom electrodes using a reverse offset printing technique. Vertically aligned and highly dense ZnO NWs were grown on the Ag patterns using hydrothermal synthesis followed by spraying of ZnSnO3 NCs using an electrohydrodynamic atomization (EHDA) technique. Finally, the top Ag electrode was patterned using an EHD patterning technique to complete the fabrication of the device. The fabricated device exhibited bipolar and rewritable characteristics, and had a nonvolatile resistive switching memory with an off/on ratio of 5.8 × 102 and a retention time of 104 s at a small operating voltage (1.2 V). The electrical results obtained with the Ag–ZnO/ZnSnO3–Ag memory device were remarkable and they showed significant repeatability. The significantly stable, highly durable and promising results obtained with the ZnO NWs–ZnSnO3 NCs heterostructure make this semiconductive nanocomposite a potential candidate for use in future flexible memory devices. [ABSTRACT FROM AUTHOR]

Published
2017
Full Text
View/download PDF

245. Dip coated stretchable and bendable PEDOTPSS films on low modulus micro-bumpy PDMS substrate

Author

Mehdi, Murtuza, Akhtar, Maaz, Hussain, Ahmad, Nauman, Muhammad, Alothmany, Dheya Shuja, Ahmed, Iqbal, and Choi, Kyung-Hyun

Abstract

Poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOTPSS) is an organic conductive polymer which has a great potential to replace metallic conductors in thin film electronics. This paper reports the experimental findings on the electromechanical performance of conductive PEDOTPSS thin films on a stretchable and flexible low modulus polymer substrate, polydimethylsiloxane (PDMS), having random micro-bumpy roughness features. All films were fabricated using the method of dip coating, which is cost effective and also favorable for mass production. The main goal of the study is to quantify the stretchability and bendability of dip coated PEDOTPSS thin films on PDMS substrate having random micro-bumpy type of roughness features. The films displayed almost constant resistance up to 10% axial strain and were also found to remain conductive when bent up to a diameter of 2 mm.

Published
2018
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results