Effects of surface morphology, size effect and wettability on interfacial adhesion of carbon nanotube arrays

Ping Chi Tsai, Yeau Ren Jeng, Chien Ping Mao, Kuan Te Wu, Franklin Chau Nan Hong

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

Vertically-aligned multi-walled carbon nanotube (MWCNT) arrays with various diameters and surface morphologies are fabricated to mimic gecko foot-hairs.The peeling behavior and interfacial adhesion characteristics of the MWCNT arrays are examined by means of depth-sensing nanoindentation technique.The results show that the adhesive force increases with an increasing surface roughness.However, the adhesive force significantly reduces with an increasing cap size due to a reduction in the number of contact sites between the MWCNT array and the indenter.Furthermore, the pull-off force of the MWCNT arrays is also found to increase with an increasing preload due to the corresponding deformation-induced increase in the contact area.Finally, it is shown that the contact angle of a water droplet on the MWCNT surface reduces with an increasing surface roughness.Thus, it is inferred that the enhanced adhesion of the MWCNT arrays with a greater surface roughness is due in part to an increased humidity and wettability of the MWCNT surface.

Original languageEnglish
Pages (from-to)401-407
Number of pages7
JournalThin Solid Films
Volume545
DOIs
Publication statusPublished - 2013 Oct 31

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Materials Chemistry

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