The role of surface defects in HOPG on the electrochemical and physical deposition of Ag
The role of defects on a substrate surface during the initial stages of nucleation and growth of Ag deposited electrochemically and physically on highly oriented pyrolytic graphite (HOPG) has been observed ex situ by scanning tunneling microscopy (STM). The silver was electrodeposited under current...
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| Format: | Article |
| Language: | English |
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Serbian Chemical Society
1999-08-01
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| Series: | Journal of the Serbian Chemical Society |
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| Online Access: | http://www.shd.org.yu/HtDocs/SHD/Vol64/No7-Pdf/V64-no7&8-7.zip |
| _version_ | 1818755413258010624 |
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| author | R. PETROVIC M. G. PAVLOVIC K. I. POPOV S. STRBAC Z. RAKOCEVIC |
| author_facet | R. PETROVIC M. G. PAVLOVIC K. I. POPOV S. STRBAC Z. RAKOCEVIC |
| author_sort | R. PETROVIC |
| collection | DOAJ |
| description | The role of defects on a substrate surface during the initial stages of nucleation and growth of Ag deposited electrochemically and physically on highly oriented pyrolytic graphite (HOPG) has been observed ex situ by scanning tunneling microscopy (STM). The silver was electrodeposited under current controlled electrochemical conditions at 26 µA/cm2, which corresponded to a deposition rate of 0.1 monolayers (ML) per second. For comparison, physical deposition of Ag on HOPG was performed by DC Ar+ ion sputtering, at the same deposition rate and for the same deposition times. In both cases, Ag grows in an island growth mode, but the distribution of the islands appears to be quite different. In physical deposition, the Ag islands are almost homogeneously distributed over the substrate surface and a slight accumulation of islands on steps does not contribute significantly to the overall morphology. This indicates the crucial role of point defects on the substrate in the initial stages of nucleation. In electrochemical deposition, more lined defects are observed after a flow of current, and their role in the beginning of the nucleation is more pronounced. Lined defects are responsible for the string-like shaped domains of deposited atoms. Also, the existence of string-like shaped nucleation exclusion zones is indicated. The problem of the formation of nucleation exclusion zones, which appear only in electrochemical deposition, has been reconsidered and a new explanaton of their formation is given. A mathematical model for the calculation of the radius of the nucleation exclusion zone has been developed. |
| first_indexed | 2024-12-18T05:38:45Z |
| format | Article |
| id | doaj.art-52cb04e9935d4ac7ba8585056d1ef80c |
| institution | Directory Open Access Journal |
| issn | 0352-5139 |
| language | English |
| last_indexed | 2024-12-18T05:38:45Z |
| publishDate | 1999-08-01 |
| publisher | Serbian Chemical Society |
| record_format | Article |
| series | Journal of the Serbian Chemical Society |
| spelling | doaj.art-52cb04e9935d4ac7ba8585056d1ef80c2022-12-21T21:19:13ZengSerbian Chemical SocietyJournal of the Serbian Chemical Society0352-51391999-08-01647-8483493The role of surface defects in HOPG on the electrochemical and physical deposition of AgR. PETROVICM. G. PAVLOVICK. I. POPOVS. STRBACZ. RAKOCEVICThe role of defects on a substrate surface during the initial stages of nucleation and growth of Ag deposited electrochemically and physically on highly oriented pyrolytic graphite (HOPG) has been observed ex situ by scanning tunneling microscopy (STM). The silver was electrodeposited under current controlled electrochemical conditions at 26 µA/cm2, which corresponded to a deposition rate of 0.1 monolayers (ML) per second. For comparison, physical deposition of Ag on HOPG was performed by DC Ar+ ion sputtering, at the same deposition rate and for the same deposition times. In both cases, Ag grows in an island growth mode, but the distribution of the islands appears to be quite different. In physical deposition, the Ag islands are almost homogeneously distributed over the substrate surface and a slight accumulation of islands on steps does not contribute significantly to the overall morphology. This indicates the crucial role of point defects on the substrate in the initial stages of nucleation. In electrochemical deposition, more lined defects are observed after a flow of current, and their role in the beginning of the nucleation is more pronounced. Lined defects are responsible for the string-like shaped domains of deposited atoms. Also, the existence of string-like shaped nucleation exclusion zones is indicated. The problem of the formation of nucleation exclusion zones, which appear only in electrochemical deposition, has been reconsidered and a new explanaton of their formation is given. A mathematical model for the calculation of the radius of the nucleation exclusion zone has been developed.http://www.shd.org.yu/HtDocs/SHD/Vol64/No7-Pdf/V64-no7&8-7.zipsurface defectselectrodepositionsilverHOPGscanning tunneling microscopy |
| spellingShingle | R. PETROVIC M. G. PAVLOVIC K. I. POPOV S. STRBAC Z. RAKOCEVIC The role of surface defects in HOPG on the electrochemical and physical deposition of Ag Journal of the Serbian Chemical Society surface defects electrodeposition silver HOPG scanning tunneling microscopy |
| title | The role of surface defects in HOPG on the electrochemical and physical deposition of Ag |
| title_full | The role of surface defects in HOPG on the electrochemical and physical deposition of Ag |
| title_fullStr | The role of surface defects in HOPG on the electrochemical and physical deposition of Ag |
| title_full_unstemmed | The role of surface defects in HOPG on the electrochemical and physical deposition of Ag |
| title_short | The role of surface defects in HOPG on the electrochemical and physical deposition of Ag |
| title_sort | role of surface defects in hopg on the electrochemical and physical deposition of ag |
| topic | surface defects electrodeposition silver HOPG scanning tunneling microscopy |
| url | http://www.shd.org.yu/HtDocs/SHD/Vol64/No7-Pdf/V64-no7&8-7.zip |
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