| 학회 | 한국재료학회 |
| 학술대회 | 2008년 가을 (11/07 ~ 11/07, 차세대융합기술연구원) |
| 권호 | 14권 2호 |
| 발표분야 | 에너지환경재료 |
| 제목 | Effect of precursor concentration on the phase formation of one-dimensional MnO2 via hydrothermal process |
| 초록 | The various polymorphs of manganese dioxide possess distinctive properties and are widely used as catalysts, ion-sieves, and electrode materials, due to their physical and chemical properties. In addition, nanostructure materials with one-dimensional (1-D) morphology (nanorods, nanowires, nanotubes, and nanoribbons) play a significant role in electrochemical performance because of their large surface-to-volume ratio and space-confined transport phenomena, which enhance the electrochemical behavior. Hence, the ability to control and manipulate the physical and chemical properties of materials is required for a specific application, which is one of the challenging issues in materials engineering. To improve the performance of MnO2, selected-control synthesis is needed and has been extensively investigated. Manganese dioxide nanorods have been synthesized by several solution phase methods. One among them is hydrothermal method that includes significant advantages, such as a homogeneous molecular level mixing, lower temperatures and high pressures, cost effectiveness, and no catalysts or templates. The shape-controlled manganese dioxides were synthesized via a simple hydrothermal method using ammonium persulfate or sodium persulfate solution as chelating and capping agent. The effects of concentration on their polymorphic forms were investigated. The synthesized nanorod structure samples were characterized by an X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The SEM micrograph shows the uniform formation of nanorods/nanowires of manganese dioxide. The characterization results for the structure and morphology of 1-D manganese dioxide will be discussed in detailed. |
| 저자 | 이현욱, P. Muralidharan, 김도경 |
| 소속 | KAIST 신소재공학과 |
| 키워드 | manganese dioxide; hydrothermal process; nanorods |
