Synthesis of nonstoichiometric titanium oxide nanoparticles using discharge in HCl solution
Synthesis of nonstoichiometric titanium oxide nanoparticles using discharge in HCl solution
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DOI：
10.1063/1.4869126
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发表时间：
2014-03-28
影响因子：
3.2
通讯作者：
Akiyama, Tomohiro
中科院分区：
文献类型：
--
作者：
Nakasugi, Yuki;Saito, Genki;Akiyama, Tomohiro
本研究演示了利用等离子体放电合成非化学计量氧化钛 (TiO2-δ) 纳米粒子。我们主要研究了电解质浓度和电极边缘屏蔽对最终产品的形貌和氧缺陷的影响。作为纳米粒子合成的前体，钛丝被用作阴极，将其浸入浓度范围为0.1-5.0 M的HCl电解液中。电极边缘被屏蔽以保持电流的均匀分布。为了进行比较，我们还使用了没有边缘屏蔽的电极。系统研究表明，所制备的产物为球形二氧化钛纳米粒子，其尺寸随着电解质浓度的降低而减小。研究发现电极的边缘屏蔽会影响产品的尺寸分布和氧化程度。在边缘屏蔽电极的情况下，产物的氧化被抑制，产生TiO1.72的产物组成。相反，在没有边缘屏蔽的电极的情况下，有利于产物的氧化，导致TiO1.90的形成。这可能是由于电流集中在电极边缘，电极边缘的升温增强了产物的氧化。这些结果证实了利用 HCl 溶液中的等离子体放电合成具有可控氧缺陷的非化学计量氧化物纳米颗粒的可能性。 (C) 2014 AIP 出版有限责任公司。
This study demonstrates the synthesis of nonstoichiometric titanium oxide (TiO2-delta) nanoparticles using plasma discharge. We have primarily investigated the effect of electrolyte concentration and edge shielding of electrode on the morphology, and oxygen defects of the final product. As a precursor for nanoparticle synthesis, titanium wire was utilized as a cathode, which was immersed in an HCl electrolyte in the concentration range of 0.1-5.0 M. The electrode edge was shielded to maintain uniform distribution of electric current. For comparison, we also used an electrode without edge shielding. Systematic studies indicate that the as-prepared products were spherical titanium oxide nanoparticles, the size of which decreased with decrease in electrolyte concentration. The edge shielding of the electrode was found to affect the size distribution and oxidation degree of the products. In case of the edge-shielded electrode, the oxidation of the product was suppressed, resulting in a product composition of TiO1.72. In contrast, in case of the electrode without edge shielding, the oxidation of the products was favored, resulting in formation of TiO1.90. This could be attributed to the concentration of electric current at the electrode edge, in which the heating-up of the electrode edge enhanced the oxidation of the product. These results confirm the possibility of synthesizing nonstoichiometric oxide nanoparticles with controllable oxygen defects by using plasma discharge in HCl solution. (C) 2014 AIP Publishing LLC.