Scholarlink

<p>Heterojunctions between metal oxide nanoparticles exhibit diverse chemisorption properties that are influenced by their composition and morphology. This study explores how varying hydroxyl ion (OH⁻) concentrations during hydrothermal synthesis affect the volatile organic compound (VOC) chemisorption properties of ZnO–CeO<sub>2</sub> heterostructures. By maintaining a fixed molar ratio of Zn- and Ce-nitrate precursors and adjusting the alkaline conditions, we synthesized ZnO–CeO<sub>2</sub> nanoparticles. The heterostructure with the highest Zn: Ce:4OH molar ratio demonstrated the best VOC-sensing performance, with a response (<i>R</i><sub>a</sub>/<i>R</i><sub>g</sub>) exceeding 30 at room temperature. This improvement is attributed to a reduction in the O 1s binding energy and an increase in the surface hydroxyl group ratio, which facilitates gas adsorption. These findings highlight a strategic approach for designing heterojunction oxide nanoparticles with higher chemisorption capabilities via pH-regulated hydrothermal synthesis. Additionally, modulating the OH⁻ concentration in metal oxide powders provides an orthogonal route to probe and tailor heterojunction functionalities arising from crystallinity differences, complementary to strategies that focus primarily on nanostructuring.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Enhancing volatile organic compound adsorption in ZnO–CeO2 heterostructures through compositional modulation

  • 期刊论文

  • 发表日期：

    2025年11月17日

查看全文
  • Jeongho Lee,
  • Min Young Kim,
  • Soo Jee Do,
  • Hyo-Jick Choi,
  • Won-Seon Seo,
  • Seung Yong Lee,
  • Kyu Hyoung Lee

摘要

Heterojunctions between metal oxide nanoparticles exhibit diverse chemisorption properties that are influenced by their composition and morphology. This study explores how varying hydroxyl ion (OH⁻) concentrations during hydrothermal synthesis affect the volatile organic compound (VOC) chemisorption properties of ZnO–CeO2 heterostructures. By maintaining a fixed molar ratio of Zn- and Ce-nitrate precursors and adjusting the alkaline conditions, we synthesized ZnO–CeO2 nanoparticles. The heterostructure with the highest Zn: Ce:4OH molar ratio demonstrated the best VOC-sensing performance, with a response (Ra/Rg) exceeding 30 at room temperature. This improvement is attributed to a reduction in the O 1s binding energy and an increase in the surface hydroxyl group ratio, which facilitates gas adsorption. These findings highlight a strategic approach for designing heterojunction oxide nanoparticles with higher chemisorption capabilities via pH-regulated hydrothermal synthesis. Additionally, modulating the OH⁻ concentration in metal oxide powders provides an orthogonal route to probe and tailor heterojunction functionalities arising from crystallinity differences, complementary to strategies that focus primarily on nanostructuring.