Highly sensitive hydrazine detection through a novel Raman scattering quenching mechanism enabled by a crystalline and noble metal–free polyoxometalate substrate  

作　　者：Chunhui Zhang Jie Wang Jieyang Zhan Runmin Yang Guanggang Gao Jiayuan Zhang Linlin Fan Mengqi Wang Hong Liu 

机构地区：[1]School of Materials Science and Engineering,University of Jinan,Ji’nan 250022,China

出　　处：《Chinese Chemical Letters》2025年第3期581-586,共6页中国化学快报(英文版)

基　　金：the financial support from the National Natural Science Foundation of China(No.21971085);the Natural Science Foundation of Shandong Province(No.ZR2021MB008)。

摘　　要：In the field of Raman spectroscopy detection,the quest for a non–noble metal,recyclable,and highly sensitive detection substrate is of utmost importance.In this work,a new crystalline and noble metal–free substrate of[Bi(DMF)_(8)][PMo_(12)O_(40)](Bi–PMo_(12))is designed,which is composed of[PMo_(12)O_(40)]^(3−)and solvated[Bi(DMF)_(8)]^(3+)cations.Mechanistic studies have revealed that Raman scattering quenching phenomenon arises from two main factors.Firstly,it arises from the absorption of the scattered light due to the transition of a single electron in the reduced state of MoV between 4d orbitals.Secondly,after the interaction between the substrate and hydrazine,the surface undergoes varying degrees of roughening,leading to an impact on the scattered light intensity.These two effects collectively contribute to the detection of low concentrations of N_(2)H_(4).As a result,Bi–PMo_(12)opens up a novel Raman scattering quenching mechanism to realize the detection of reduced N_(2)H_(4)small molecules.A remarkably low detection limit of 4.5×10^(−9)ppm for N_(2)H_(4)is achieved on the Bi–PMo_(12)substrate.This detection has a lower concentration than the currently known SERS detection of N_(2)H_(4).Moreover,Bi–PMo_(12)can be recovered and reused through recrystallization,achieving a recovery rate of up to ca.51%.This study reveals the underlying potential of crystalline polyoxometalate materials in the field of Raman detection,thus opening up new avenues for highly sensitive analysis using Raman techniques.

关 键 词：POLYOXOMETALATE HYDRAZINE Raman detection QUENCHING Single crystal 

分 类 号：O657.37[理学—分析化学]