基于甲胺铅三溴化物钙钛矿纳米晶体的受限空间生长实现的荧光双模式开启和波长移动用于甲胺气体传感。

Dual-Mode of Fluorescence Turn-On and Wavelength-Shift for Methylamine Gas Sensing Based on Space-Confined Growth of Methylammonium Lead Tribromide Perovskite Nanocrystals.

机构信息

Department of Chemistry and the MOE Key Laboratory of Spectrochemical Analysis & Instrumentation, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, Fujian 361005, China.

College of Chemistry, Chemical Engineering and Environment, Minnan Normal University, Zhangzhou, Fujian 363000, China.

出版信息

Anal Chem. 2020 Apr 21;92(8):5661-5665. doi: 10.1021/acs.analchem.0c00698. Epub 2020 Apr 7.

DOI:10.1021/acs.analchem.0c00698

PMID:32243135

Abstract

The defect-tolerant nature of lead halide perovskites renders outstanding luminescence by simple space-confined growth in nanopores. The fluorescence turn-on and wavelength-shift phenomena could be found in the formation of methylammonium lead tribromide (MAPbBr) nanocrystals in hollow SiO nanospheres triggered by the reaction between methylamine (MA) gas and HPbBr/PbBr@SiO nanospheres. The enhanced fluorescence intensity is linear with the MA concentration in the range of 1.0-95 ppm with a limit of detection (LOD) of 70 ppb (S/N = 3). In addition, the maximum emission wavelength is consistently red-shifted from 478.7 to 510.6 nm as the MA concentration increases from 1.0 to 95 ppm, imparting the potential for colorimetric sensing. By combining the fluorescence turn-on and colorimetric sensing modes, the flexible method meets the demands for visual discrimination and point-of-care determination with portable devices.

摘要

卤铅钙钛矿的容错特性通过在纳米孔中简单的空间限制生长来实现出色的发光。在空心 SiO2 纳米球中，通过 MA 气体与 HPbBr/PbBr@SiO2 纳米球之间的反应，形成了甲胺基铅三溴化物 (MAPbBr) 纳米晶体，从而发现了荧光开启和波长移动现象。荧光强度与 MA 浓度在 1.0-95 ppm 的范围内呈线性关系，检测限 (LOD) 为 70 ppb（S/N = 3）。此外，随着 MA 浓度从 1.0 增加到 95 ppm，最大发射波长从 478.7nm 持续红移到 510.6nm，赋予了比色传感的潜力。通过结合荧光开启和比色传感模式，该灵活的方法满足了对便携式设备进行可视化识别和即时检测的需求。