| 학회 |
한국화학공학회 |
| 학술대회 |
2011년 가을 (10/26 ~ 10/28, 송도컨벤시아) |
| 권호 |
17권 2호, p.1998 |
| 발표분야 |
촉매 |
| 제목 |
Distinct Platinum Growth Mode on Shape controlled Gold Nanocrystals |
| 초록 |
Depositing ultralow amount of Pt to reduce Pt usage is an important issue in various areas. Underpotential deposition (UPD) of Cu on Au and galvanic exchangement of as deposited Cu to Pt is easy and simple method to deposit ultralow amount of Pt on Au surface. Although there are already many researches going on using UPD method, they usually lack of investigating precise structure of deposited Pt. We have observed distinct Pt growth mode on different shapes of gold nanocrystals (GNC). Different shapes of GNC have different surface crystalline structure. Cube GNC has (100) facet and octahedral GNC has (111) facet. While Pt on cube GNC showed particle growth, Pt on octahedral GNC showed layer by layer growth. Distinct growth mode of Pt was examined through HR-TEM. By using DFT calculation we have confirmed that Pt on Au(111) surface was more stable as monolayer rather than particle while Pt on Au(100) surface was more stable as particle rather than monolayer. Also more positively shifted CO stripping peak of Pt on Au (100) surface revealed particle growth of Pt on Au(100) surface. |
| 저자 |
양성은1, 한정우1, 김청희1, 박나영2, 이승철2, 이현주1
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| 소속 |
1연세대, 2한국과학기술(연) |
| 키워드 |
Gold; Platinum; Growth mode; Epitaxial growth; DFT caculation
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| E-Mail |
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| 원문파일 |
초록 보기 |
