Upconversion fluorescent nanoprobe based on the 4-NP reversible structure for a wide range of pH determination. (25th May 2022)

• Record Type: Journal Article
• Authors: Fu, Meirong; Yang, Min; Xu, Xia
• Is Part Of: New journal of chemistry. Volume 46:Number 23(2022)
• Page Start: 11220
• Page End: 11228
• Publication Date: 2022-05-25
• Subjects: Chemistry -- Periodicals; Chimie -- Périodiques; 540
• DOI: 10.1039/d2nj01803a
• Languages: English
• ISSNs: 1144-0546

Abstract

Abstract : Core@shell@SiO2 @4-NP, as a pH probe, responds to different fluorescent signals of acid and base under 980 nm excitation. Abstract : The accurate detection of pH value has received increasing attention in various fields. However, most reported probes show pH values in the acidic or alkaline range, and work within a narrow pH range. Herein, core@shell@SiO2 @4-NP, as a pH probe, responds to different fluorescence signals of acid and base under 980 nm excitation. The emission peak area ratio at 360 nm and 345 nm (denoted as R ( I 360nm / I 345nm )) shows a linear relationship with pH ( R = −0.11916 × pH + 1.4856). Therefore, a wide pH range in the solution can be quantitatively detected via R ( I 360nm / I 345nm ). In addition, core@shell@SiO2 @4-NP has good upconversion fluorescence reversibility between pH = 2.0 and pH = 10.0. These advantages make the proposed upconversion fluorescent nanoprobe based on the 4-NP reversible structure a promising solution for on-line pH detection under different conditions.