Low concentration detection SERS (Surface Enhanced Raman Scattering) substrate of PMMA spaced gold nanocube and gold film composite structure
A composite structure and cube technology, which is applied in measuring devices, instruments, and material analysis through optical means, can solve the problems of small electric field enhancement, single structure, complex preparation process, etc., and achieve the effect of high electric field enhancement
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Embodiment 1
[0028] refer to figure 1 The shown composite structure of gold nanocubes and gold film separated by PMMA is a low-concentration detection SERS substrate, including a glass substrate 1 , a titanium film 2 , a gold film 3 , a PMMA film 4 , gold nanocubes 5 and an analyte 6 .
[0029] The glass substrate 1 is made of silicon dioxide fused silica material with a thickness of about 1mm.
[0030] A titanium thin film 2 with a thickness of 5 nm is prepared on the glass substrate 1 by magnetron sputtering.
[0031] A gold thin film 3 with a thickness of 50 nm is prepared on the titanium thin film 2 by magnetron sputtering.
[0032] PMMA thin film 4 with a thickness of 30 nm was prepared on gold thin film 3 in 1% PMMA anisole solution at 2000 rpm for 60 s.
[0033] Gold nanocube 5 is prepared by chemical synthesis. In aqueous solution, the average size of gold nanocube is 170nm, the concentration is 50μg / mL, and it is diluted to 6.25μg / mL with deionized water.
[0034] The analyte 6...
Embodiment 2
[0038] Prepare a concentration of 10 -11 M of R6G aqueous solution, and 30 μL was added to 270 μL of gold nanocube aqueous solution with a concentration of 6.25 μg / mL to obtain 10 -12 M's R6G, 5.625 μg / mL gold nanocube mixed aqueous solution. After drying naturally, a composite structure of gold nanocubes and gold film with PMMA intervals adsorbed on the analyte 6 was obtained. The measured SERS spectra are shown in image 3 shown. Others are with embodiment 1.
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