A kind of MOF-noble metal composite SERS substrate and preparation method thereof
What is Al technical title?
Al technical title is built by PatSnap Al team. It summarizes the technical point description of the patent document.
A MOF-, precious metal technology, applied in the field of MOF-precious metal composite SERS substrate and its preparation, can solve the problems of large specific surface area, large porosity, weak binding ability, poor detection signal, etc., and achieve high porosity, high repetition rate, specific The effect of surface area reduction
Active Publication Date: 2020-09-04
ZHONGBEI UNIV
View PDF2 Cites 0 Cited by
Summary
Abstract
Description
Claims
Application Information
AI Technical Summary
This helps you quickly interpret patents by identifying the three key elements:
Problems solved by technology
Method used
Benefits of technology
Problems solved by technology
The composite particles combine the large specific surface area and high porosity of MOF materials, which can effectively adsorb and enrich the analyte molecules and the excellent surface plasmon properties of gold nanoparticles, which significantly improves the sensitivity of the composite SERS substrate for the detection of organic pollutants and solves the problem At present, the weak binding ability between polycyclic aromatic hydrocarbons and traditional precious metal materials and the poor detection signal have successfully realized the rapid, direct and highly sensitive SERS detection of polycyclic aromatic hydrocarbons.
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more
Image
Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
Click on the blue label to locate the original text in one second.
Reading with bidirectional positioning of images and text.
Smart Image
Examples
Experimental program
Comparison scheme
Effect test
preparation example Construction
[0029] The preparation method of described MOF-AuNPs composite SERS substrate, comprises the steps:
[0030] ① Preparation of MIL-101: Add 5mmol of chromium nitrate nonahydrate, hydrofluoric acid, terephthalic acid and 24mL of deionized water into the reaction kettle, keep the temperature at 220°C for 12h, then gradually cool down to 150°C within 1h, Slowly drop to room temperature within 12h. The product was centrifuged to obtain MIL-101(Cr) powder. Disperse 1 mg of MIL-101(Cr) powder in 10 mL of methanol to obtain a MIL-101(Cr) methanol dispersion with a concentration of 0.1 mg / mL.
[0031] (1) Preparation of AuNPs: Rapidly add sodium borohydride (0.01M, 0.6mL) solution at 2-4°C to tetrachloroauric acid (0.01M, 0.25mL) and CTAB (0.1M, 7.5mL) by seed growth method ) in the mixed solution, vigorously stirred for 1 min, and stood at room temperature for 1 h to obtain gold seeds.
[0041] Quickly add sodium borohydride (0.01M, 0.6mL) solution at 2-4°C to a mixed solution of tetrachloroauric acid (0.01M, 0.25mL) and CTAB (0.1M, 7.5mL), stir vigorously for 1min, and After standing for 1 h, gold seeds (8.35 mL) were obtained.
Embodiment 2
[0043] The preparation of gold seed growth solution, its step is:
[0044] Add CTAB (0.1M, 6.4mL), tetrachloroauric acid (0.01M, 6.8mL), and ascorbic acid (0.1M, 3.8mL) to 32 mL of ultrapure water in sequence to prepare a gold seed growth solution (49 mL).
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more
PUM
Property
Measurement
Unit
particle size
aaaaa
aaaaa
particle diameter
aaaaa
aaaaa
Login to view more
Abstract
The invention relates to the field of MOF-noble metal nanocomposite materials, in particular to a MOF-noble metal composite SERS substrate and a preparation method thereof. In the alcohol solution, the CTAB-modified positively charged noble metal nanoparticles were supported on the surface of the MOF material through electrostatic interaction to form a MOF-noble metal nanocomposite SERS substrate. Compared with the in-situ growth method, the present invention loads noble metal nanoparticles on the surface of MOF through electrostatic interaction, while maintaining the high porosity, specific surface area and excellent adsorption capacity of MOF materials, it can achieve the metal nanoparticles on the surface of MOF. The shape, size and density can be precisely controlled to prepare a large number of Raman active sites, which can further effectively improve the SERS performance of the composite substrate. The MOF-AuNPs composite SERS substrate prepared by the present invention has dual functions of adsorption enrichment and Raman enhancement, without surface modification, and can realize direct and highly sensitive detection of molecules such as fluoranthene.
Description
technical field [0001] The invention relates to the field of MOF-noble metal nanocomposite materials, in particular to a MOF-noble metal composite SERS substrate and a preparation method thereof. Background technique [0002] Surface-enhanced Raman scattering technology is an ultrasensitive and non-destructive molecular detection technology, which is widely used in chemical sensing, biomedicine, environmental pollutant detection and other fields. Nowadays, it is still an important challenge to prepare SERS substrates with high sensitivity, good reproducibility and high stability to realize rapid, direct and highly sensitive detection of environmental organic pollutants. Polycyclic aromatic hydrocarbons, a product of petroleum combustion, have poor adsorption to the surface of traditional noble metal SERS substrates, and it is difficult to reach the local surface plasmon resonance region, and the SERS effect is weak. At present, surface modification-the method of introducing...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more
Application Information
Patent Timeline
Application Date:The date an application was filed.
Publication Date:The date a patent or application was officially published.
First Publication Date:The earliest publication date of a patent with the same application number.
Issue Date:Publication date of the patent grant document.
PCT Entry Date:The Entry date of PCT National Phase.
Estimated Expiry Date:The statutory expiry date of a patent right according to the Patent Law, and it is the longest term of protection that the patent right can achieve without the termination of the patent right due to other reasons(Term extension factor has been taken into account ).
Invalid Date:Actual expiry date is based on effective date or publication date of legal transaction data of invalid patent.
Login to view more