In:
Physical Chemistry Chemical Physics, Royal Society of Chemistry (RSC), Vol. 25, No. 26 ( 2023), p. 17496-17507
Abstract:
Taking advantage of metal–semiconductor junctions, functional nanocomposites have been designed and developed as active substrates for surface-enhanced Raman scattering (SERS) sensing systems. In this work, we prepared three types of nanocomposites based on manganese oxide (MnO 2 ) nanostructures and electrochemically synthesized silver nanoparticles (e-AgNPs), which differed according to the morphologies of MnO 2 . The SERS performance of MnO 2 nanosheet/e-Ag (MnO 2 -s/e-Ag), MnO 2 nanorod/e-Ag (MnO 2 -r/e-Ag), and MnO 2 nanowire/e-Ag (MnO 2 -w/e-Ag) was then evaluated using tricyclazole (TCZ), a commonly used pesticide, as an analyte. Compared to the others, MnO 2 -s/e-Ag exhibited the most remarkable SERS enhancement. Thanks to its large surface area and ability to accept/donate the electrons of the semiconductor, MnO 2 -s acted as a bridge to improve the charge transfer efficiency from e-Ag to TCZ. In addition, the MnO 2 content of the nanocomposites was also considered to optimize the SERS sensing performance. With the optimal MnO 2 content of 25 wt%, MnO 2 -s/e-Ag could achieve the best SERS performance, allowing the detection of TCZ at concentrations down to 6 × 10 −12 M in standard solutions and 10 −11 M in real rice samples.
Type of Medium:
Online Resource
ISSN:
1463-9076
,
1463-9084
Language:
English
Publisher:
Royal Society of Chemistry (RSC)
Publication Date:
2023
detail.hit.zdb_id:
1476283-3
detail.hit.zdb_id:
1476244-4
detail.hit.zdb_id:
1460656-2
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