NDLI: Fabrication of long-range ordered, broccoli-like SERS arrays and application in detecting endocrine disrupting chemicals

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Fabrication of long-range ordered, broccoli-like SERS arrays and application in detecting endocrine disrupting chemicals

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Inside back cover

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Journal of Materials Chemistry C Vol - 3 Issue - 5

Journal of Materials Chemistry C Vol -2

Journal of Materials Chemistry C Vol -1

Fabrication of long-range ordered, broccoli-like SERS arrays and application in detecting endocrine disrupting chemicals

Content Provider	Royal Society of Chemistry (RSC)
Author	Das, Biswajit Li, Yiyan Qin, Gaowu Shen, Wen Chen, Jing
Copyright Year	2015
Abstract	Periodic broccoli-shaped Au and Ag surface-enhanced Raman spectroscopy (SERS) arrays were fabricated by combining ordered SiO2 colloidal crystal templates with the physical deposition technique. The SiO2 colloidal crystal-assisted Au and Ag SERS substrates have a long-range, adjustable periodic structure and a clean surface without incorporating any reductants or surfactant chemicals. Different from depositing directly on the flat substrates, the colloidal crystal-assisted nanostructure array has a larger effective surface area under the same projected area of laser irradiation, which exposes more “hot spots”. An increased roughness and a larger surface area have also been created as the highly bumpy surface feature of the broccoli-shaped SERS morphologies, resulting in a greater Raman amplification than the conventional metal film over nanosphere (MFON). SERS performances by Au and Ag SERS arrays reveal that the long-range broccoli-like morphology is a promising SERS platform as it is highly sensitive, reproducible and stable. The colloidal crystal-assisted Ag SERS array has a slightly higher enhancement factor (EF) than the Au SERS array, and they both are of the order of 107 enhancement. Compared to our previous work, which directly deposited noble metal nanoparticles onto flat substrates, the EF of the colloidal crystal-assisted SERS array is improved by one to two orders of magnitude. Finite-difference time-domain (FDTD) simulation was performed to estimate the electromagnetic field distribution. Finally, two endocrine disrupting chemicals (EDCs) (dioctyl phthalate (DOP) and dibutyl phthalate (DBP), homologous series) at different concentrations were successfully identified by Au and Ag SERS arrays with the detection limits of 0.24 × 10−9 M and 0.22 × 10−9 M, respectively. This study suggests that the broccoli-like Au and Ag SERS arrays are promising candidates for chemical sensing and this SERS substrate fabrication technique can be accessible to the standard industrial processes.
Starting Page	1309
Ending Page	1318
Page Count	10
File Format	HTM / HTML PDF
ISSN	20507526
Volume Number	3
Issue Number	6
Journal	Journal of Materials Chemistry C
DOI	10.1039/c4tc02224f
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	SERS DOP Surface-enhanced Raman spectroscopy Colloidal crystal Surfactant Nanostructure Laser Raman amplification Noble metal Finite-difference time-domain method Electromagnetic field Endocrine system Bis(2-ethylhexyl) phthalate Dibutyl phthalate Homologous series
Content Type	Text
Resource Type	Article
Subject	Chemistry Materials Chemistry

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