Nanosized Core-Shell Ni/Au System and its Properties
Core-shell Ni/Au nanoparticles are synthesized by successive reduction of aqueous solutions of nickel sulfate and chloroauric acid by sodium tetrahydroborate. Results of analysis of absorption spectra show that the position of the plasmon absorption peak (507 nm) for Au-shell (1 nm) corresponds to t...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
al-Farabi Kazakh National University
2015-04-01
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| Series: | Eurasian Chemico-Technological Journal |
| Online Access: | http://ect-journal.kz/index.php/ectj/article/view/239 |
| _version_ | 1811299169039548416 |
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| author | Ju. Z. Zakharov N. K. Yeremenko A. S. Bogomjakov R. P. Kolmykov A. N. Yeremenko |
| author_facet | Ju. Z. Zakharov N. K. Yeremenko A. S. Bogomjakov R. P. Kolmykov A. N. Yeremenko |
| author_sort | Ju. Z. Zakharov |
| collection | DOAJ |
| description | Core-shell Ni/Au nanoparticles are synthesized by successive reduction of aqueous solutions of nickel sulfate and chloroauric acid by sodium tetrahydroborate. Results of analysis of absorption spectra show that the position of the plasmon absorption peak (507 nm) for Au-shell (1 nm) corresponds to the one for individual gold nanoparticles of the same size. Discussion of the published results about the blocking temperature TB in the core-shell systems, synthesized by different methods, and obtained results (TB = 14 ± 0.5 K for nickel core), and HRTEM and elemental analysis results allowed to show that there is linear dependence lgТВ – lgD and ТВ – V. It is estimated the average coefficient of magnetic anisotropy K ≈ 4.5∙103 J/m3). For Ni-core with special small sizes in the ferromagnetic state there is no magnetization saturation in the field up to 20 kOe. This is the typical behavior for them in the superparamagnetic state also. |
| first_indexed | 2024-04-13T06:32:10Z |
| format | Article |
| id | doaj.art-b54b2e04669d452c81e31252c21270df |
| institution | Directory Open Access Journal |
| issn | 1562-3920 2522-4867 |
| language | English |
| last_indexed | 2024-04-13T06:32:10Z |
| publishDate | 2015-04-01 |
| publisher | al-Farabi Kazakh National University |
| record_format | Article |
| series | Eurasian Chemico-Technological Journal |
| spelling | doaj.art-b54b2e04669d452c81e31252c21270df2022-12-22T02:58:07Zengal-Farabi Kazakh National UniversityEurasian Chemico-Technological Journal1562-39202522-48672015-04-0117215916410.18321/ectj206239Nanosized Core-Shell Ni/Au System and its PropertiesJu. Z. Zakharov0N. K. Yeremenko1A. S. Bogomjakov2R. P. Kolmykov3A. N. Yeremenko4Kemerovo State University, Krasnaya st., 6, 650043 Kemerovo, RussiaInstitute of coal chemistry and material science SB RAS, Sovietsky Av., 18, 650000, Kemerovo, RussiaThe Scientific research institute of the International tomographic center SB RAS, Novosibirsk, RussiaKemerovo State University, Krasnaya st., 6, 650043 Kemerovo, RussiaInstitute of coal chemistry and material science SB RAS, Sovietsky Av., 18, 650000, Kemerovo, RussiaCore-shell Ni/Au nanoparticles are synthesized by successive reduction of aqueous solutions of nickel sulfate and chloroauric acid by sodium tetrahydroborate. Results of analysis of absorption spectra show that the position of the plasmon absorption peak (507 nm) for Au-shell (1 nm) corresponds to the one for individual gold nanoparticles of the same size. Discussion of the published results about the blocking temperature TB in the core-shell systems, synthesized by different methods, and obtained results (TB = 14 ± 0.5 K for nickel core), and HRTEM and elemental analysis results allowed to show that there is linear dependence lgТВ – lgD and ТВ – V. It is estimated the average coefficient of magnetic anisotropy K ≈ 4.5∙103 J/m3). For Ni-core with special small sizes in the ferromagnetic state there is no magnetization saturation in the field up to 20 kOe. This is the typical behavior for them in the superparamagnetic state also.http://ect-journal.kz/index.php/ectj/article/view/239 |
| spellingShingle | Ju. Z. Zakharov N. K. Yeremenko A. S. Bogomjakov R. P. Kolmykov A. N. Yeremenko Nanosized Core-Shell Ni/Au System and its Properties Eurasian Chemico-Technological Journal |
| title | Nanosized Core-Shell Ni/Au System and its Properties |
| title_full | Nanosized Core-Shell Ni/Au System and its Properties |
| title_fullStr | Nanosized Core-Shell Ni/Au System and its Properties |
| title_full_unstemmed | Nanosized Core-Shell Ni/Au System and its Properties |
| title_short | Nanosized Core-Shell Ni/Au System and its Properties |
| title_sort | nanosized core shell ni au system and its properties |
| url | http://ect-journal.kz/index.php/ectj/article/view/239 |
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