Catalytic locomotion of core–shell nanowire motors
- Authors
- Jang, Bumjin; Wang, Wei; Wiget, Samuel; Petruska, Andrew J.; Chen, Xiangzhong; Hu, Chengzhi; Hong, Ayoung; Folio, David; Ferreira, Antoine; Pané, Salvador; Nelson, Bradley J.
- Issue Date
- Nov-2016
- Publisher
- American Chemical Society
- Keywords
- catalytic nanomotors; core-shell nanowires; electrodeposition; net propulsive force; self-diffusiophoresis; self-electroosmosis
- Citation
- ACS Nano, v.10, no.11, pp 9983 - 9991
- Pages
- 9
- Indexed
- SCI
SCIE
SCOPUS
- Journal Title
- ACS Nano
- Volume
- 10
- Number
- 11
- Start Page
- 9983
- End Page
- 9991
- URI
- https://scholarworks.bwise.kr/erica/handle/2021.sw.erica/114419
- DOI
- 10.1021/acsnano.6b04224
- ISSN
- 1936-0851
1936-086X
- Abstract
- We report Au/Ru core-shell nanowire motors. These nanowires are fabricated using our previously developed electrodeposition-based technique, and their catalytic locomotion in the presence of H2O2 is investigated. Unlike conventional bimetallic nanowires that are self-electroosmotically propelled, our open-ended Au/Ru core-shell nanowires show both a noticeable decrease in rotational diffusivity and increase in motor speed with increasing nanowire length. Numerical modeling based on self-electroosmosis attributes decreases in rotational diffusivity to the formation of toroidal vortices at the nanowire tail, but fails to explain the speed increase with length. To reconcile this inconsistency, we propose a combined mechanism of self-diffusiophoresis and electroosmosis based on the oxygen gradient produced by catalytic shells. This mechanism successfully explains not only the speed increase of Au/Ru core-shell nanomotors with increasing length, but also the large variation in speed among Au/Ru, Au/Rh, and Rh/Au core-shell nanomotors. The possible contribution of diffusiophoresis to an otherwise well-established electroosmotic mechanism sheds light on future designs of nanomotors, at the same time highlighting the complex nature of nanoscale propulsion. © 2016 American Chemical Society.
- Files in This Item
-
Go to Link
- Appears in
Collections - COLLEGE OF ENGINEERING SCIENCES > DEPARTMENT OF ROBOT ENGINEERING > 1. Journal Articles
![qrcode](https://api.qrserver.com/v1/create-qr-code/?size=55x55&data=https://scholarworks.bwise.kr/erica/handle/2021.sw.erica/114419)
Items in ScholarWorks are protected by copyright, with all rights reserved, unless otherwise indicated.