Guangdong Provincial Engineering Technology Research Center for Optical Agriculture, College of Materials and Energy, South China Agricultural University, Guangzhou 510642, China.
Guangdong Provincial Engineering Technology Research Center for Optical Agriculture, College of Materials and Energy, South China Agricultural University, Guangzhou 510642, China.
J Colloid Interface Sci. 2016 Sep 15;478:256-62. doi: 10.1016/j.jcis.2016.06.026. Epub 2016 Jun 8.
In this paper, our effort was focused on preparation and oxygen sensing of luminescence carbon dots (CDs) assembled hollow mesoporous silica microspheres (HMSMs) and mesoporous silica microspheres (MSMs). MSMs doped with CDs showed shorter response time and recovery time comparing with HMSMs doped with CDs. This feature can be attributed to ordered channel structure of mesoporous carrier which can promote the gas diffusion effectively. While HMSMs doped with CDs shows a higher oxygen quenching response and the degree of quenching reach 80.35%. The response time was determined to be about 7s and the emission intensities of the samples were effectively reduced as the concentration of oxygen increased. These results indicate that the system we have developed can be used for oxygen detection in wide concentration range and is especially accurate for very low oxygen concentrations. The obtained CDs grafted hollow mesoporous silica microspheres (HMSMs) and mesoporous silica microspheres (MSMs) samples appears to be a promising sensing material for environmental detection application and would also find applications in catalyst, electrode, or related fields.
本文致力于制备和氧传感发光碳点（CDs）组装的中空介孔硅微球（HMSMs）和介孔硅微球（MSMs）。与 CDs 掺杂的 HMSMs 相比，CDs 掺杂的 MSMs 具有更短的响应时间和恢复时间。这一特性可以归因于介孔载体的有序通道结构，它可以有效地促进气体扩散。而 CDs 掺杂的 HMSMs 表现出更高的氧猝灭响应，猝灭程度达到 80.35%。响应时间约为 7s，随着氧浓度的增加，样品的发射强度被有效降低。这些结果表明，我们所开发的系统可用于宽浓度范围的氧检测，尤其对极低氧浓度的检测非常准确。所得的接枝有碳点的中空介孔硅微球（HMSMs）和介孔硅微球（MSMs）样品似乎是一种很有前途的环境检测用传感材料，也将在催化剂、电极或相关领域得到应用。
