Co-Doped ZnS Clusters and Nanostructures Produced by Pulsed Laser Ablation

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• 作者：Mar铆a Jadraque ; Anton B. Evtushenko ; David 脕vila-Brande ; Marien L贸pez-Arias ; Vincent Loriot ; Yuri G. Shukhov ; Lidiya S. Kibis ; Alexander V. Bulgakov ; Margarita Mart铆n
• 刊名：The Journal of Physical Chemistry C
• 出版年：2013
• 出版时间：March 14, 2013
• 年：2013
• 卷：117
• 期：10
• 页码：5416-5423
• 全文大小：406K
• 年卷期：v.117,no.10(March 14, 2013)
• ISSN：1932-7455

文摘

In this work, we synthesize Co-doped ZnS nanocrystals by pulsed laser ablation and deposition and investigate the composition and dynamics of the plasma produced in the ablation by time-of-flight mass spectrometry. The first experimental observation of Co-substituted ZnS clusters in the ablation plasma is reported; three series of cationic bimetallic clusters Zn_n鈥?i>mCo_mS_n⁺, Zn_n鈥?i>mCo_mS_n+1⁺, and Zn_n鈥?i>mCo_mS_n鈥?⁺ are identified upon 1064 nm laser ablation of targets of Co (2%) in ZnS. Neutral clusters produced in the ablation are also observed by F₂ laser (位 = 157 nm) postionization. Deposits are collected at the same laser ablation wavelength and fluence at which the above bimetallic clusters are observed in the plasma. Analysis by high-resolution transmission electron microscopy and energy-dispersive X-ray spectrometry obtains that the deposits are composed of Zn_0.96Co_0.04S nanocrystals with local structure showing epitaxial growth between the zinc blende and wurtzite politypes. The deposits show paramagnetic behavior, but no magnetic ordering is observed. The results constitute a first step to help to elucidate the participation of cluster assembly processes in the synthesis of Co-doped ZnS nanomaterials by pulsed laser ablation and deposition.