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

Content Provider	IEEE Xplore Digital Library
Author	Wu, C.C. Chang, H.C.
Copyright Year	2002
Description	Author affiliation: Inst. of Biomed. Eng., Nat. Cheng Kung Univ., Tainan, Taiwan (Wu, C.C.; Chang, H.C.)
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 /spl mu/m/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/spl plusmn/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/spl plusmn/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.
Starting Page	27
Ending Page	30
File Size	368781
Page Count	4
File Format	PDF
ISBN	0780374800
DOI	10.1109/MMB.2002.1002258
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2002-05-02
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Force measurement Thickness measurement Polymer films Atomic force microscopy Gold Atomic measurements Biomedical measurements Biomedical electrodes Force feedback Instruments
Content Type	Text
Resource Type	Article

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