Preparation, characterization and oxygen sensing properties of luminescent carbon dots assembled mesoporous silica microspheres

Li Wang; Haoran Zhang; Xiaohua Zhou; Yingliang Liu; Bingfu Lei

doi:10.1016/j.jcis.2016.06.026

Preparation, characterization and oxygen sensing properties of luminescent carbon dots assembled mesoporous silica microspheres

J Colloid Interface Sci. 2016 Sep 15:478:256-62. doi: 10.1016/j.jcis.2016.06.026. Epub 2016 Jun 8.

Authors

Li Wang¹, Haoran Zhang¹, Xiaohua Zhou¹, Yingliang Liu², Bingfu Lei³

Affiliations

¹ Guangdong Provincial Engineering Technology Research Center for Optical Agriculture, College of Materials and Energy, South China Agricultural University, Guangzhou 510642, China.
² Guangdong Provincial Engineering Technology Research Center for Optical Agriculture, College of Materials and Energy, South China Agricultural University, Guangzhou 510642, China. Electronic address: tliuyl@163.com.
³ Guangdong Provincial Engineering Technology Research Center for Optical Agriculture, College of Materials and Energy, South China Agricultural University, Guangzhou 510642, China. Electronic address: tleibf@scau.edu.cn.

PMID: 27309945
DOI: 10.1016/j.jcis.2016.06.026

Abstract

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.

Keywords: Hollow mesoporous silica microspheres; Luminescence carbon dots; Mesoporous silica microspheres; Oxygen sensing.