Selective Synthesis of α or β-HgS Nanocrystals via Core/Shell Formation Using Surface Modified CdS Quantum Dots
| Autor: | Chaitanya B. Hiragond, Sreenu Bhanoth, Priyesh V. More, Pawan K. Khanna |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Nanostructure Materials science Surface modified Alloy Biomedical Engineering Bioengineering 02 engineering and technology General Chemistry engineering.material 021001 nanoscience & nanotechnology Condensed Matter Physics Photochemistry 01 natural sciences Ion Core shell Nanocrystal Quantum dot 0103 physical sciences engineering General Materials Science Neutral ph 0210 nano-technology |
| Zdroj: | Journal of Nanoscience and Nanotechnology. 18:242-250 |
| ISSN: | 1533-4880 |
| DOI: | 10.1166/jnn.2018.14589 |
| Popis: | Chalogenides (CdS, CdSe, ZnSe etc.) are well known to undergo cation exchange reactions with other cations, including metals. The cation exchange methods are highly efficient in obtaining core/shell as well as alloy type of nanostructures. Such synthesis approach is particularly useful for producing CdHgX (X = S, Se) alloys, CdX/HgX core/shell and HgX nanostructures as organometallic mercury precursors are very inconvenient to handle. In this work, we have first synthesized hydrophilic CdS quantum dots using various capping agents and studied its cation exchange reaction with Hg2+ ions. The CdS QDs readily reacts with Hg2+ ions at ambient conditions and neutral pH to form either HgS or CdS/HgS core/shell nanostructures. Interestingly, we have observed that capping agent of CdS QDs plays an crucial role in formation of specific form of HgS (α and β). The growth of HgS shell on CdS core with systematic increase in Hg ion concentration is also explored. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|