Growth of gold particles on glassy carbon from a Thiosulphate-sulphite aged electrolyte
Interest has grown in developing non-toxic electrolytes for gold electrodeposition to replace the conventional cyanide-based bath for long term sustainability of gold electroplating. A solution containing thiosulphate and sulphite has been developed specially for microelectronics applications. Howev...
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| Format: | Article |
| Language: | English |
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Universiti Putra Malaysia Press
2008
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| Online Access: | http://psasir.upm.edu.my/id/eprint/40538/ http://psasir.upm.edu.my/id/eprint/40538/1/Growth%20of%20Gold%20Particles%20on%20Glassy%20Carbon%20from%20a%20Thiosulphate-Sulphite%20Aged%20Electrolyte.pdf |
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| author | Sobri, Shafreeza Roy, S. Kalman, E. Nagyp, P. Lakatos, M. |
| author_facet | Sobri, Shafreeza Roy, S. Kalman, E. Nagyp, P. Lakatos, M. |
| author_sort | Sobri, Shafreeza |
| building | UPM Institutional Repository |
| collection | Online Access |
| description | Interest has grown in developing non-toxic electrolytes for gold electrodeposition to replace the conventional cyanide-based bath for long term sustainability of gold electroplating. A solution containing thiosulphate and sulphite has been developed specially for microelectronics applications. However, at the end of the electrodeposition process, the spent electrolyte can contain a significant amount of gold in solution. This study has been initiated to investigate the feasibility of gold recovery from a spent thiosulphate-sulphite electrolyte. This paper presents the microscopy observations of crystal growth of gold on glassy carbon as a function of deposition potentials and time. It was found that the initial deposition of gold at less cathodic potential corresponds to an electrochemical diffusion control of gold discharge from which spherical nuclei are obtained. When a certain induction time for spherical growth has passed, the initial growing nuclei become unstable and the thin gold deposit begins to develop tips which eventually grow larger and produce dendrites. The dendritic growth is controlled by surface diffusion limitations of gold nuclei. |
| first_indexed | 2025-11-15T09:50:41Z |
| format | Article |
| id | upm-40538 |
| institution | Universiti Putra Malaysia |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-15T09:50:41Z |
| publishDate | 2008 |
| publisher | Universiti Putra Malaysia Press |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | upm-405382015-11-20T02:31:47Z http://psasir.upm.edu.my/id/eprint/40538/ Growth of gold particles on glassy carbon from a Thiosulphate-sulphite aged electrolyte Sobri, Shafreeza Roy, S. Kalman, E. Nagyp, P. Lakatos, M. Interest has grown in developing non-toxic electrolytes for gold electrodeposition to replace the conventional cyanide-based bath for long term sustainability of gold electroplating. A solution containing thiosulphate and sulphite has been developed specially for microelectronics applications. However, at the end of the electrodeposition process, the spent electrolyte can contain a significant amount of gold in solution. This study has been initiated to investigate the feasibility of gold recovery from a spent thiosulphate-sulphite electrolyte. This paper presents the microscopy observations of crystal growth of gold on glassy carbon as a function of deposition potentials and time. It was found that the initial deposition of gold at less cathodic potential corresponds to an electrochemical diffusion control of gold discharge from which spherical nuclei are obtained. When a certain induction time for spherical growth has passed, the initial growing nuclei become unstable and the thin gold deposit begins to develop tips which eventually grow larger and produce dendrites. The dendritic growth is controlled by surface diffusion limitations of gold nuclei. Universiti Putra Malaysia Press 2008-01 Article PeerReviewed application/pdf en http://psasir.upm.edu.my/id/eprint/40538/1/Growth%20of%20Gold%20Particles%20on%20Glassy%20Carbon%20from%20a%20Thiosulphate-Sulphite%20Aged%20Electrolyte.pdf Sobri, Shafreeza and Roy, S. and Kalman, E. and Nagyp, P. and Lakatos, M. (2008) Growth of gold particles on glassy carbon from a Thiosulphate-sulphite aged electrolyte. Pertanika Journal of Science & Technology, 16 (1). pp. 41-48. ISSN 0128-7680; ESSN: 2231-8526 http://www.pertanika.upm.edu.my/Pertanika%20PAPERS/JST%20Vol.%2016%20%281%29%20Jan.%202008/08%20Page%2041-48.pdf |
| spellingShingle | Sobri, Shafreeza Roy, S. Kalman, E. Nagyp, P. Lakatos, M. Growth of gold particles on glassy carbon from a Thiosulphate-sulphite aged electrolyte |
| title | Growth of gold particles on glassy carbon from a Thiosulphate-sulphite aged electrolyte |
| title_full | Growth of gold particles on glassy carbon from a Thiosulphate-sulphite aged electrolyte |
| title_fullStr | Growth of gold particles on glassy carbon from a Thiosulphate-sulphite aged electrolyte |
| title_full_unstemmed | Growth of gold particles on glassy carbon from a Thiosulphate-sulphite aged electrolyte |
| title_short | Growth of gold particles on glassy carbon from a Thiosulphate-sulphite aged electrolyte |
| title_sort | growth of gold particles on glassy carbon from a thiosulphate-sulphite aged electrolyte |
| url | http://psasir.upm.edu.my/id/eprint/40538/ http://psasir.upm.edu.my/id/eprint/40538/ http://psasir.upm.edu.my/id/eprint/40538/1/Growth%20of%20Gold%20Particles%20on%20Glassy%20Carbon%20from%20a%20Thiosulphate-Sulphite%20Aged%20Electrolyte.pdf |