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The Solvent Problem: Redissolution of Macromolecules in Solution-Processed Organic Electronics
Carol Newby,이진균,Christopher K. Ober 한국고분자학회 2013 Macromolecular Research Vol.21 No.3
After deposition, solution processed macromolecules are susceptible to redissolution by similar solvents. This “solvent problem” puts undesirable restrictions on the subsequent processing of organic devices; particularly when forming multiple layers or using organic patterning materials. In this review we survey the creative approaches seeking to resolve the solvent problem. We conclude that two of these approaches show promise as comprehensive solutions; use of orthogonal solvents such as hydofluoroethers, and, use of cross-linking additives. Furthering development of these or other approaches provides the community with plentiful opportunity for valuable future work.
An electrochemical glucose sensor from an organically modified nanocomposite of viologen and TiO2.
Kim, Yuna,Malliaras, George G,Ober, Christopher K,Kim, Eunkyoung American Scientific Publishers 2010 Journal of nanoscience and nanotechnology Vol.10 No.10
<P>An organically modified TiO2 nanocomposite was explored for glucose detection. Bis-Butyl viologen (BBV) was mixed with TiO2 nanoparticles to generate highly dispersed nanocomposite solution, which provided organically modified nanocomposite film of TiO2 (BBV-TiO2). A transistor type sensor was fabricated using the BBV-TiO2 film and platinum gate electrode. The BBV-TiO2 nanocomposite sensor showed higher sensitivity to glucose sensing in low concentration region compared to that of TiO2 sensor. This result was ascribed to facilitated electron transport by the adsorbed viologen molecules on TiO2 nanoparticles, where viologen molecules act as an electron transfer mediator between enzyme and TiO2.</P>
Crystallization of Precursors to Forsterite and Chromium-Doped Forsterite
Park, Dong Gon Martin, M. Hogan E. Ober, Christopher K. Burlitch, James M. Cavin, O. Burl Porter, Wallace D. Hubbard, Camden R. 숙명여자대학교 자연과학연구소 1994 자연과학논문집 Vol.- No.5
The pyrolysis and crystallization of poly(mathacrylate) precursors and xerogels of forsterite and chromiumdoped forsterite were studied by in situ high-temperature, dynamic X-ray diffraction and thermal analysis. For both types of precursor, crystallization of forsterite occurred at lower temperature when doped with chromium. Also, exotherms above 700℃ occurred 50℃ lower when chromium was present. When residual carbon in the xerogels was more than ∼1%, an unidentified crystalline intermediate phase formed at ∼800℃. Conversion of the intermediate phase to forsterite was faster than amorphous material. Thus, full crystallinity was attained at a lower temperature when the xerogels had some residual carbon.
Crystallization of Precursors to Forsterite and Chromium-Doped Forsterite
Park, Dong Gon,Martin, M. Hogan E.,Ober, Christopher K.,Burlitch, James M.,Cavin, O. Burl,Porter, Wallace D.,Hubbard, Camden R. 숙명여자대학교 자연과학연구소 1994 자연과학논문집 Vol.- No.5
The pyrolysis and crystallization of poly(mathacrylate) precursors and xerogels of forsterite and chromiumdoped forsterite were studied by in situ high-temperature, dynamic X-ray diffraction and thermal analysis. For both types of precursor, crystallization of forsterite occurred at lower temperature when doped with chromium. Also, exotherms above 700℃ occurred 50℃ lower when chromium was present. When residual carbon in the xerogels was more than ∼1%, an unidentified crystalline intermediate phase formed at ∼800℃. Conversion of the intermediate phase to forsterite was faster than amorphous material. Thus, full crystallinity was attained at a lower temperature when the xerogels had some residual carbon.
Orthogonal Processing: A Novel Photolithographic Patterning Method for Organic Electronics
Lee, Jin-Kyun,Taylor, Priscillia G.,Zakhidov, Alexander A.,Fong, Hon Hang,Hwang, Ha Soo,Chatzichristidi, Margarita,Malliaras, George G.,Ober, Christopher K. The Conference of Photopolymer Science and Technol 2009 フォトポリマ-懇話會誌= Journal of photopolymer science and t Vol.22 No.5
<P>Organic electronics is an extensively studied subject opening new horizons in electronics technology. It has attracted great attention as a technology to enable flexible electronic devices through solution processing of organic and polymeric materials. However, patterning of organic materials to construct device components still remains one of the major hurdles to be overcome due to problems with chemical processing. Fundamentally this challenge originates from the limited number of options regarding orthogonal solvents. Recently, we have identified supercritical carbon dioxide (scCO<SUB>2</SUB>) and segregated hydrofluoroethers (HFEs) as universal, non-damaging solvents for most non-fluorinated polymeric materials. These unconventional solvents expand processing options from the two-dimensional plane to three-dimensional space by drawing another orthogonal axis. Taking advantage of those noble solvents and fluorinated photoresists, we were able to make patterns of functional organic materials photolithographically. Furthermore, our orthogonal processing method has been applied to the fabrication of a patterned polymer light-emitting device in scCO<SUB>2</SUB> and an organic thin-film transisotor in HFEs.</P>