WANG Xiao-li,LIU Hao,DU Long-xiao,et al.Construction and Performance Study of a Novel Ratimetric Nanoprobe for Nitric Oxide Detection[J].Journal of Instrumental Analysis,2024,43(02):247-253.
WANG Xiao-li,LIU Hao,DU Long-xiao,et al.Construction and Performance Study of a Novel Ratimetric Nanoprobe for Nitric Oxide Detection[J].Journal of Instrumental Analysis,2024,43(02):247-253. DOI: 10.12452/j.fxcsxb.23090601.
Construction and Performance Study of a Novel Ratimetric Nanoprobe for Nitric Oxide Detection
该文首先通过两步化学反应合成NO识别分子3,4-二氨基苯硫醇(DABT),然后制备具有强表面拉曼增强散射(SERS)效应的银包金纳米星(AuNSs@Ag)材料,并通过Ag—S键对其进行DABT修饰,制备了比率型SERS纳米探针AuNSs@Ag-DABT。利用透射电子显微镜、水合粒径、Zeta电位以及紫外吸收光谱对纳米探针进行表征,并开展了NO的定量检测。结果表明:构建的AuNSs@Ag-DABT纳米探针表面有尖锐突出的星状结构,尺寸约为80 nm。NO存在时,DABT与NO发生反应并在541 cm
In this study,a NO recognition molecule,3,4-diaminobenzenethiol(DABT),through a two-step chemical reaction was firstly synthesized. Subsequently,silver-coated gold nanostars(AuNSs@Ag) with strong surface-enhanced Raman scattering(SERS) effect were prepared. Then,AuNSs@Ag was further modified with DABT via Ag—S bonding,resulting in a ratiometric SERS nanoprobe,AuNSs@Ag-DABT. The prepared nanoprobe was characterized using such as transmission electron microscopy (TEM), hydrodynamic particle size analysis (DLS), Zeta potential measurement, and ultraviolet absorption spectroscopy. Subsequently,quantitative detection of NO was carried out. The experimental results showed that the constructed nanoprobe exhibited a star-shaped structure with sharp protrusions on the surface,with a size of approximately 80 nm. In the presence of NO,DABT reacted with NO,leading to the appearance of a new Raman peak near 541 cm
-1
(attributed to the triazole ring),while the Raman peak at 1 078 cm
-1
(attributed to C—S out-of-plane bending) remained unchanged. Therefore,NO could be quantitatively detected based on the ratio of
I
541
/
I
1078
. Under the optimal conditions,the ratio of
I
541
/
I
1078
showed a good linear response to NO concentrations in the range of 10-60 nmol/L,with a detection limit of 3.89 nmol/L. Furthermore,selective experiments demonstrated that the ratiometric SERS nanoprobe exhibited specificity and interference resistance in response to NO.