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Polymer-based tubular microbots: role of composition and preparation

Gao, Wei and Sattayasamitsathit, Sirilak and Uygun, Aysegul and Pei, Allen and Ponedal, Adam and Wang, Joseph (2012) Polymer-based tubular microbots: role of composition and preparation. Nanoscale, 4 (7). pp. 2447-2453. ISSN 2040-3364. https://resolver.caltech.edu/CaltechAUTHORS:20180124-143806361

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Abstract

The influence of the composition and electropolymerization conditions upon the propulsion of new template-prepared polymer-based bilayer microtubular microbots is described. The effects of different electropolymerized outer layers, including polypyrrole (PPy), poly(3,4-ethylenedioxythiophene) (PEDOT), polyaniline (PANI), and of various inner catalytic metal surfaces (Ag, Pt, Au, Ni-Pt alloy), upon the movement of such bilayer microtubes are evaluated and compared. Electropolymerization conditions, such as the monomer concentration and medium (e.g. surfactant, electrolyte), have a profound effect upon the morphology and locomotion of the resulting microtubes. The most efficient propulsion is observed using PEDOT/Pt microbots that offer a record-breaking speed of over 1400 body lengths s−1 at physiological temperature, which is the fastest relative speed reported to date for all artificial micro/nanomotors. An inner Pt-Ni alloy surface is shown useful for combining magnetic control and catalytic fuel decomposition within one layer, thus greatly simplifying the preparation of magnetically-guided microbots. Polymer-based microbots with an inner gold layer offer efficient biocatalytic propulsion in low peroxide level in connection to an immobilized catalase enzyme. Metallic Au/Pt bilayer microbots can also be prepared electrochemically to offer high speed propulsion towards potential biomedical applications through functionalization of the outer gold surface. Such rational template preparation and systematic optimization of highly efficient microbots hold considerable promise for diverse practical applications.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1039/C2NR30138EDOIArticle
http://pubs.rsc.org/en/content/articlehtml/2012/nr/c2nr30138ePublisherArticle
ORCID:
AuthorORCID
Gao, Wei0000-0002-8503-4562
Additional Information:© 2012 Royal Society of Chemistry. Received 16th January 2012 , Accepted 14th February 2012. First published on 16th February 2012. This work was supported by the National Science Foundation (Award Number CBET 0853375). A. U. thanks the Fulbright Scholarship program. The authors greatly thank J. Orozco and A. Katzenberg for assisting with the catalase modification and microtube preparation, respectively.
Funders:
Funding AgencyGrant Number
NSFCBET-0853375
Fullbright ScholarshipUNSPECIFIED
Issue or Number:7
Record Number:CaltechAUTHORS:20180124-143806361
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20180124-143806361
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:84508
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:31 Jan 2018 18:32
Last Modified:09 Mar 2020 13:18

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