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Mechanical properties of polydopamine (PDA) thin films

Published online by Cambridge University Press:  28 January 2019

Haoqi Li Open the ORCID record for Haoqi Li [Opens in a new window] ,
Jiaxin Xi ,
Yao Zhao  and
Fei Ren
Haoqi Li*
Affiliation:
Department of Mechanical Engineering, College of Engineering, Temple University, Philadelphia, PA19122, U.S.A.
Jiaxin Xi
Affiliation:
Department of Mechanical Engineering, College of Engineering, Temple University, Philadelphia, PA19122, U.S.A.
Yao Zhao
Affiliation:
Department of Mechanical Engineering, College of Engineering, Temple University, Philadelphia, PA19122, U.S.A.
Fei Ren
Affiliation:
Department of Mechanical Engineering, College of Engineering, Temple University, Philadelphia, PA19122, U.S.A.
*
*(Email: haoqi.li@temple.edu)
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Abstract

Polydopamine (PDA) is a biopolymer, which can form uniform thin films on almost all solid substrates as well as at the liquid/air interface. Carbonized polydopamine possesses graphite-like structure and exhibits high electrical conductivity, which makes it a potential carbon-based thin film conductor. However, studies on mechanical behavior of PDA and its derived materials are very limited. In this study, PDA samples were synthesized through self-assembly of dopamine in aqueous solution. Elastic modulus of thin films was measured using the nanoindentation technique. It is shown that the Young’s modulus of PDA thin film increased with increasing heat treatment temperature (up to 600°C). Doping with Cu ions also increased the Young’s modulus of PDA. Furthermore, all PDA thin films, with and without Cu, exhibited creep behavior.

Keywords

polymernano-indentationdopantthin filmstress/strain relationship
Type
Articles
Information
MRS Advances , Volume 4 , Issue 7: Nanomaterials , 2019 , pp. 405 - 412
Copyright
Copyright © Materials Research Society 2019 

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