Effect of Tin Addition on Mesoporous Silica Thin Film and Its Application for Surface Photovoltage NO2 Gas Sensor

详细信息    查看全文

• 作者：Brian Yuliarto ; HaoShen Zhou ; Takeo Yamada ; Itaru Honma ; Yosuke Katsumura ; and Masaki Ichihara
• 刊名：Analytical Chemistry
• 出版年：2004
• 出版时间：November 15, 2004
• 年：2004
• 卷：76
• 期：22
• 页码：6719 - 6726
• 全文大小：432K
• 年卷期：v.76,no.22(November 15, 2004)
• ISSN：1520-6882

文摘

Self-ordered and structure-controlled transparent films oftin-modified mesoporous silica (Sn/Si ratio of 0.5-3%)were first prepared using a molecule surfactant templatemethod employing spin coating. A surface photovoltage(SPV) NO₂ gas sensor was then fabricated using these self-ordered tin-modified mesoporous silica thin films basedon a metal-insulator-semiconductor structure. Highlysensitive tin-modified mesoporous silica was obtained thatcould detect NO₂ gas concentrations of as low as 300 ppbat room temperature. The detection mechanism for NO₂is believed to involve both the surface area, whichcontributes to the change in dielectric constant, and theamount of tin incorporated, which contributes to thechange in charge. It was found that, in this SPV sensor,the optimal Sn/Si ratio of 0.5% delivered record-highsensing performance.