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Ag/TiO2 flexible SERS substrate capable of being repeatedly utilized and preparation method thereof

A substrate and flexible technology, applied in the nano field, can solve the problems of weak silver nanoparticles on the surface of the film, complex SERS substrate process, poor reusability, etc., to achieve easy control of the reaction process, controllable amount of silver nanoparticles, and not easy to fall off. Effect

Inactive Publication Date: 2016-03-02
ANHUI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a Ag / TiO 2 Flexible, reusable SERS substrate and its preparation method to overcome the preparation of Ag / TiO 2 SERS substrate material SERS substrate has defects such as complex process, difficult process control, weak silver nanoparticles on the surface of the film, and poor reusability

Method used

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  • Ag/TiO2 flexible SERS substrate capable of being repeatedly utilized and preparation method thereof
  • Ag/TiO2 flexible SERS substrate capable of being repeatedly utilized and preparation method thereof
  • Ag/TiO2 flexible SERS substrate capable of being repeatedly utilized and preparation method thereof

Examples

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Effect test

Embodiment 1

[0025] (1) Flatten a titanium sheet with a thickness of 0.2 mm and an area of ​​30 mm × 10 mm, and then use acetone and ethanol to ultrasonically clean it for 30 minutes, then use chemical polishing to polish the polished Ti sheet. Under the protection of nitrogen, blow dry with cold air for later use. Chemical polishing adopts impregnation method, and the volume ratio is HF:HNO 3 :H 2 O=1:1:4 in a mixed solution, and polish until the oxide layer on the surface of the titanium sheet is completely dissolved and turns bright silver; (2) Lean one side of the polished titanium sheet in a polytetrafluoroethylene with a volume of 100ml In the lined high-pressure reaction kettle, slowly add the prepared 4mol / L NaOH aqueous solution until the titanium sheet is completely submerged, cover it and place it in a blast drying oven at 200°C for 48 hours at a constant temperature; (3) use tweezers to Take out the sample carefully, rinse it repeatedly with deionized water, soak it in 0.1mol...

Embodiment 2

[0031] (1) Clean the titanium sheet sequentially with acetone and ethanol for 40 minutes, then chemically polish it, rinse it repeatedly with distilled water, and dry it with cold air under the protection of nitrogen for later use; (2) lean one side of the polished titanium sheet against high pressure In the reaction kettle, slowly add NaOH aqueous solution with a concentration of 4.5mol / L until the titanium sheet is completely submerged, cover the autoclave and place it in a blast drying oven for 40 hours at a constant temperature of 220°C; (3) Take out the titanium sheet and use a deionized After repeated washing with water, soak in 0.12mol / L HCl solution for 14 hours, then take out the titanium sheet, rinse it repeatedly with deionized water, dry it with cold air, and then anneal in a muffle furnace at 420°C for 3.5 hours and then cool it naturally to room temperature. TiO obtained in anatase phase 2 Nanobelt; (4) TiO 2 The nanoribbons were first soaked in 50mL of AgNO wit...

Embodiment 3

[0033] (1) Clean the titanium sheet sequentially with acetone and ethanol for 20 minutes, then chemically polish it, rinse it repeatedly with distilled water, and dry it with cold air under the protection of nitrogen for later use; (2) lean one side of the polished titanium sheet against a high pressure In the reaction kettle, slowly add NaOH aqueous solution with a concentration of 3.5mol / L until the titanium sheet is completely submerged, cover the autoclave and place it in a blast drying oven for 56 hours at a constant temperature of 180°C; (3) Take out the titanium sheet and use a deionized After repeated washing with water, soak in 0.08mol / L HCl solution for 10 hours, then take out the titanium sheet, rinse it repeatedly with deionized water, dry it with cold air, then anneal in a muffle furnace at 380°C for 2.5 hours and then cool it naturally to room temperature. TiO obtained in anatase phase 2 Nanobelt; (4) TiO 2 The nanoribbons were first soaked in 50mL of AgNO with ...

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Abstract

The invention discloses a preparation method of an Ag / TiO2 flexible SERS substrate capable of being repeatedly utilized. A thin Ti sheet is adopted as a Ti source, a TiO2 nanobelt array with Ti as a substrate is prepared through a hydro-thermal synthesis method, an SERS substrate material of Ag / TiO2 is prepared through a continuous ion deposition method, the Ti sheet can be cut to be of any shape and size according to test requirements, the large-area SERS substrate material can be prepared according to the size of the Ti sheet, and potential industrial production prospects are achieved. In addition, the number of silver nanoparticles on the surface of an Ag / TiO2 film is controllable, the silver nanoparticles are firm and not likely to fall off, an organic tested objected adsorbed on the surface of the material can be degraded and decomposed under the irradiation of a xenon lamp light source, the function of detoxicating the SERS material is achieved, and therefore a sample can be used repeatedly and cyclically.

Description

technical field [0001] The invention belongs to the field of nanotechnology, in particular to a Ag / TiO 2 Flexible, reusable SERS substrate and its preparation method. Background technique [0002] Surface-enhanced Raman spectroscopy (Surface-enhancedRamanscattering, SERS) is a new, rapid and highly sensitive detection method. Because of its ultra-low detection limit in the field of molecular detection, it can provide fingerprint information of substances, it does not destroy samples during detection, and it can achieve rapid detection. Therefore, it is particularly important to develop effective SERS labeling materials. Efficient SERS labeling materials must not only have a strong enhancement factor, but also have good stability and reproducibility. It has been found that noble metal-supported semiconductor materials have a strong SERS enhancement effect due to the synergistic effect between noble metals and semiconductors, so they can be used as one of the best choices fo...

Claims

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Application Information

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IPC IPC(8): G01N21/65C23C22/64C23C22/82C23C22/78C23C18/42
CPCG01N21/658C23C18/42C23C22/64C23C22/78C23C22/82
Inventor 李洋陈昌兆任萍王成唐旭东
Owner ANHUI UNIV OF SCI & TECH
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