A novel method of measuring the thickness of hydrated ultrathin polymer film by the force curve of atomic force microscopy

C. C. Wu, H. C. Chang

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

A novel method based on the force vs. distance curve (force curve) of atomic force microscopy was developed to measure ultrathin poly (o-phenylenediamine) (PPD) film electropolymerized on gold electrode in liquid. When 1 to 0.25 μm/s was chosen to be the rising rate of the scanner and 50% of the confidence interval as the qualifying threshold value, the thickness of the hydrated polymer film could be calculated. This result was compared with one obtained from an AFM image. A step-like electrode fabricated by a photolithographic process was used. The height difference of the electrode before and after the PPD coating was imaged in liquid, and then the real thickness, 19.6±5.2 nm, was obtained. The sample was also measured by estimating the transition range of the force curve of hydrated PPD film, and the thickness of the hydrated PPD film was determined to be 19.3±8.2 nm. However, the results calculated by integrating the electropolymerized charge for the oxidation process of o-PD was only one-third as large as it was the two previously described methods. This indicated that the structure of hydrated PPD film might have been swollen.

Original languageEnglish
Title of host publication2nd Annual International IEEE-EMBS Special Topic Conference on Microtechnologies in Medicine and Biology - Proceedings
EditorsDavid Beebe, Andre Dittmar
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages27-30
Number of pages4
ISBN (Electronic)0780374800, 9780780374805
DOIs
Publication statusPublished - 2002 Jan 1
Event2nd Annual International IEEE-EMBS Special Topic Conference on Microtechnologies in Medicine and Biology - Madison, United States
Duration: 2002 May 22002 May 4

Publication series

Name2nd Annual International IEEE-EMBS Special Topic Conference on Microtechnologies in Medicine and Biology - Proceedings

Other

Other2nd Annual International IEEE-EMBS Special Topic Conference on Microtechnologies in Medicine and Biology
CountryUnited States
CityMadison
Period02-05-0202-05-04

All Science Journal Classification (ASJC) codes

  • Biotechnology
  • Microbiology (medical)

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    Wu, C. C., & Chang, H. C. (2002). A novel method of measuring the thickness of hydrated ultrathin polymer film by the force curve of atomic force microscopy. In D. Beebe, & A. Dittmar (Eds.), 2nd Annual International IEEE-EMBS Special Topic Conference on Microtechnologies in Medicine and Biology - Proceedings (pp. 27-30). [1002258] (2nd Annual International IEEE-EMBS Special Topic Conference on Microtechnologies in Medicine and Biology - Proceedings). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/MMB.2002.1002258