|
2
|
Evans U, Soyemi O, Doescher MS, Bunz UH, Kloppenburg L, Myrick ML. Spectroelectrochemical study of the oxidative doping of polydialkylphenyleneethynylene using iterative target transformation factor analysis. Analyst 2001; 126:508-12. [PMID: 11340989 DOI: 10.1039/b009038g] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Iterative target transformation factor analysis (ITTFA) was used to determine the spectra of the individual species generated during the oxidative p-doping of films of poly(para-phenyleneethynylene) (PPE). UV-visible spectra of PPE films on transparent electrodes were obtained in-situ during an anodic sweep. ITTFA identified 4 species present during the oxidation, which we assign as neutral polymer, polaron species, bipolaron species, and a species formed by further bipolaron reaction. The region of electrochemical stability for each of these species was identified and their potential-dependent profiles were obtained. This work is the first deconvolution of conjugated polymer spectroelectrochemistry.
Collapse
Affiliation(s)
- U Evans
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, SC 29201, USA
| | | | | | | | | | | |
Collapse
|
|
3
|
Soyemi O, Eastwood D, Zhang L, Li H, Karunamuni J, Gemperline P, Synowicki RA, Myrick ML. Design and Testing of a Multivariate Optical Element: The First Demonstration of Multivariate Optical Computing for Predictive Spectroscopy. Anal Chem 2001. [DOI: 10.1021/ac0012896] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Affiliation(s)
- O. Soyemi
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, Department of Chemistry and Biochemistry, East Carolina University, Greenville, North Carolina 27258, and J. A. Woollam Company Inc., 645 M Street, Suite 102, Lincoln, Nebraska 68508
| | - D. Eastwood
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, Department of Chemistry and Biochemistry, East Carolina University, Greenville, North Carolina 27258, and J. A. Woollam Company Inc., 645 M Street, Suite 102, Lincoln, Nebraska 68508
| | - L. Zhang
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, Department of Chemistry and Biochemistry, East Carolina University, Greenville, North Carolina 27258, and J. A. Woollam Company Inc., 645 M Street, Suite 102, Lincoln, Nebraska 68508
| | - H. Li
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, Department of Chemistry and Biochemistry, East Carolina University, Greenville, North Carolina 27258, and J. A. Woollam Company Inc., 645 M Street, Suite 102, Lincoln, Nebraska 68508
| | - J. Karunamuni
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, Department of Chemistry and Biochemistry, East Carolina University, Greenville, North Carolina 27258, and J. A. Woollam Company Inc., 645 M Street, Suite 102, Lincoln, Nebraska 68508
| | - P. Gemperline
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, Department of Chemistry and Biochemistry, East Carolina University, Greenville, North Carolina 27258, and J. A. Woollam Company Inc., 645 M Street, Suite 102, Lincoln, Nebraska 68508
| | - R. A. Synowicki
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, Department of Chemistry and Biochemistry, East Carolina University, Greenville, North Carolina 27258, and J. A. Woollam Company Inc., 645 M Street, Suite 102, Lincoln, Nebraska 68508
| | - M. L. Myrick
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, Department of Chemistry and Biochemistry, East Carolina University, Greenville, North Carolina 27258, and J. A. Woollam Company Inc., 645 M Street, Suite 102, Lincoln, Nebraska 68508
| |
Collapse
|
|
4
|
Myrick ML, Soyemi O, Li H, Zhang L, Eastwood D. Spectral tolerance determination for multivariate optical element design. Fresenius J Anal Chem 2001; 369:351-5. [PMID: 11293715 DOI: 10.1007/s002160000642] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
Recent reports from our laboratory have described a method for all-optical multivariate chemometric prediction from optical spectroscopy. The concept behind this optical approach is that a spectral pattern (a regression vector) can be encoded into the spectrum of an optical filter. The key element of these measurement schemes is the multivariate optical element (MOE), a multiwavelength interference-based spectral discriminator that is tied to the regression vector of a particular measurement. The fabrication of these MOEs is a complex operation that requires precise techniques. However, to date, no quantitative means of determining the allowable design/ manufacturing errors for MOEs has existed. The purpose of the present report is to show how the spectroscopy of a sample is used to define the accuracy with which MOEs must be designed and manufactured. We conclude this report with a general treatment of spectral tolerance and a worked example. The worked example is based on actual experimental measurements. We show how the spectral bandpass is defined operationally in a real problem, and how the statistics of the theoretical regression vector influence both the bandpass and the minimum tolerances. In the experimental example, we demonstrate that tolerances range continuously between 1 (totally tolerant) to approximately 10(-3) (0.1% T) in this problem.
Collapse
Affiliation(s)
- M L Myrick
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia 29208, USA
| | | | | | | | | |
Collapse
|