| 학회 | 한국재료학회 |
| 학술대회 | 2005년 가을 (11/10 ~ 11/11, 한양대학교) |
| 권호 | 11권 2호 |
| 발표분야 | 나노 및 생체재료 |
| 제목 | 단일벽 탄소나노튜브의 연속적인 흡착에 의한 Layer-by-layer 다층 자기조립막의 형성과 조립막의 전기적 특성 |
| 초록 | Layer-by-layer self-assembly is a template-assisted process in which charge reversal techniques using polyelectrolytes enable the deposition of films layer-by-layer. The LbL self assembly is a versatile method of assembling molecular films with a variety of charged materials. The technique provides precise control over the physical and chemical properties of the multilayer architecture by changes in the deposition conditions, for example by varying the ionic strength or pH of the solution. For carbon nanotubes(CNTs), there are various method for making film architecture, Langmuir-Blodgett and self-assembly etc. But it is difficult to deposit well-dispersed and uniform nanotubes monolayer and multilayer. LbL self-assembly is the one method to fabricate good nanotubes film. In this work, we will describe an improved method for making thin film architectures incorporating CNTs and present some data on the electrical properties of the layers. Single and multiwall nanotubes with an anionic or cationic coating have been prepared by exploiting the ability of certain surfactants to form a monolayer shell around the CNTs. This treatment promotes the dispersion of the nanotubes bundles, increasing their solubility in water. The presence of electrically charged functional groups on the surface of the CNTs then allows thin film deposition to proceed via the electrostatic LbL method. A variety of different CNT architectures has been built up. In one arrangement, a single species of a modified CNT (anionic or cationic) was assembled with the other polymer to form a composite and a multilayer film composed of alternating anionic and cationic modified CNTs was fabricated. The dc conductivities of the thin film films were measured at room temperature and contrasted with reference architectures (i.e. those containing no CNTs). This showed clearly that the incorporation of CNTs into the multilayer assemblies resulted in electrically conductive thin films. And impedance and admittance were used to study the dynamics of bound or mobile charge in the bulk or interfacial regions of each architecture. |
| 저자 | 이계웅1, Marco Palumbo2, Mike C. Petty3, 안병태2 |
| 소속 | 1한국과학기술원 신소재공학과, 2School of Engnieering, 3Durham Univ. |
| 키워드 | single-walled nanotubes; Layer-by-Layer self-assembly; multilayer |
