Ag-MOF/AuNRs nano composite material as well as preparation and application thereof

Abstract

The invention relates to an Ag-MOF / AuNRs nano composite material and preparation and application thereof. The nano composite material comprises gold nanorods (AuNRs) serving as a matrix and a metal organic framework (Ag-MOF) self-polymerized on the surfaces of the gold nanorods, and the preparation method specifically comprises the steps of taking and evenly mixing an AuNRs solution and an organic solution containing organic ligands, then adding a silver source solution, carrying out auto-polymerization reaction on the MOF on the surfaces of the AuNRs, and after the reaction is finished, carrying out post-treatment to obtain the Ag-MOF / AuNRs nano composite material. Compared with the prior art, the method has the advantages that the good effect of detecting low-concentration aldehyde substances can be achieved, in addition, the requirement for large-scale rapid analysis in a laboratory can be met, and the aldehyde substances in the environment can be selectively detected.

Description

technical field

[0001] The invention belongs to the technical field of nanomaterial preparation and analytical chemical detection, and in particular relates to an Ag-MOF / AuNRs nanocomposite material and its preparation and application. Background technique

[0002] Aldehydes are harmful to human health. Long-term exposure to the environment containing aldehydes can cause headaches, palpitations, insomnia and other discomfort symptoms, and even lead to the occurrence of blood cancer, lymphoma and other cancers. At present, the detection of aldehydes has become an important issue in indoor air. Therefore, the detection of trace aldehydes in the environment has always been the focus of attention.

[0003] A new portable surface-enhanced Raman detection technology with high selectivity, high sensitivity and rapid detection of trace aldehydes in the environment can quickly detect trace aldehydes in the environment and reduce the chance of cancer. Surface-enhanced Raman spectrosc...

Examples

preparation example Construction

[0029] The preparation method of AuNRs solution (a method that has been disclosed in the literature) is as follows: take CTAB (cetyltrimethylammonium bromide) and NaOL (sodium oleate) and dissolve them in hot water, and then add them sequentially after cooling AgNO 3 (silver nitrate) solution and HAuCl 4 (tetrachloroauric acid) solution, after mixing evenly, add acid (hydrochloric acid) to adjust, then add ascorbic acid solution and seed solution in turn, and finally stand still to obtain AuNRs solution, wherein the seed solution contains HAuCl with a molar ratio of 2.5:1:6 4 , CTAB and NaBH 4 , CTAB, NaOL, AgNO 3 , HAuCl 4 , ascorbic acid solution, HAuCl in seed solution 4 , CTAB and NaBH in the seed solution 4 The addition ratio is (7.0-9.0)g:(1.3-1.6)g:(0.072-0.096)mM:0.25mM:0.08mM:(0.09-0.18)mM:(36.36-72.72)mM:(0.22-0.44 ) mM. The addition amount ratio is based on the amount taken at the beginning, without considering the reaction between the various compounds durin...

Embodiment 1

[0033] A preparation method of Ag-MOF / AuNRs nanocomposite material, specifically comprising the following steps:

[0034] Mix 2mL of 18mM AuNRs solution with 2mL of 5.5mM 2-aminoterephthalic acid solution, stir at 30°C at a speed of 100rpm for 60min, then slowly add 2mL of 22mM silver acetate solution into the above solution, Stirring at 100rpm at 30°C for 30min, and then standing at 30°C for 24h, followed by centrifugation at 7000rpm for 30min, washing with ethanol, and vacuum drying at 60°C for 8h to obtain Ag-MOF / AuNRs nanocomposites.

[0035] The synthesized materials were tested by infrared, respectively as figure 1 shown. figure 1 Shown in, 3445cm -1 The characteristic peak at represents the stretching of O-H, 1610cm -1 The characteristic peak at represents the stretching of N-H, 1416cm -1 The characteristic peak at represents the stretching of C=O, 1375cm -1 The characteristic peak at represents the stretching of C=C, 1251cm -1 The characteristic peak at represent...

Embodiment 2

[0037] An Ag-MOF / AuNRs nanocomposite material, the preparation method adopted is the same as that of Example 1 except that the silver source solution used is a silver nitrate solution.

technical field

[0001] The invention belongs to the technical field of nanomaterial preparation and analytical chemical detection, and in particular relates to an Ag-MOF / AuNRs nanocomposite material and its preparation and application. Background technique

[0002] Aldehydes are harmful to human health. Long-term exposure to the environment containing aldehydes can cause headaches, palpitations, insomnia and other discomfort symptoms, and even lead to the occurrence of blood cancer, lymphoma and other cancers. At present, the detection of aldehydes has become an important issue in indoor air. Therefore, the detection of trace aldehydes in the environment has always been the focus of attention.

[0003] A new portable surface-enhanced Raman detection technology with high selectivity, high sensitivity and rapid detection of trace aldehydes in the environment can quickly detect trace aldehydes in the environment and reduce the chance of cancer. Surface-enhanced Raman spectrosc...

Examples

preparation example Construction

[0029] The preparation method of AuNRs solution (a method that has been disclosed in the literature) is as follows: take CTAB (cetyltrimethylammonium bromide) and NaOL (sodium oleate) and dissolve them in hot water, and then add them sequentially after cooling AgNO 3 (silver nitrate) solution and HAuCl 4 (tetrachloroauric acid) solution, after mixing evenly, add acid (hydrochloric acid) to adjust, then add ascorbic acid solution and seed solution in turn, and finally stand still to obtain AuNRs solution, wherein the seed solution contains HAuCl with a molar ratio of 2.5:1:6 4 , CTAB and NaBH 4 , CTAB, NaOL, AgNO 3 , HAuCl 4 , ascorbic acid solution, HAuCl in seed solution 4 , CTAB and NaBH in the seed solution 4 The addition ratio is (7.0-9.0)g:(1.3-1.6)g:(0.072-0.096)mM:0.25mM:0.08mM:(0.09-0.18)mM:(36.36-72.72)mM:(0.22-0.44 ) mM. The addition amount ratio is based on the amount taken at the beginning, without considering the reaction between the various compounds durin...

Embodiment 1

[0033] A preparation method of Ag-MOF / AuNRs nanocomposite material, specifically comprising the following steps:

[0034] Mix 2mL of 18mM AuNRs solution with 2mL of 5.5mM 2-aminoterephthalic acid solution, stir at 30°C at a speed of 100rpm for 60min, then slowly add 2mL of 22mM silver acetate solution into the above solution, Stirring at 100rpm at 30°C for 30min, and then standing at 30°C for 24h, followed by centrifugation at 7000rpm for 30min, washing with ethanol, and vacuum drying at 60°C for 8h to obtain Ag-MOF / AuNRs nanocomposites.

[0035] The synthesized materials were tested by infrared, respectively as figure 1 shown. figure 1 Shown in, 3445cm -1 The characteristic peak at represents the stretching of O-H, 1610cm -1 The characteristic peak at represents the stretching of N-H, 1416cm -1 The characteristic peak at represents the stretching of C=O, 1375cm -1 The characteristic peak at represents the stretching of C=C, 1251cm -1 The characteristic peak at represent...

Embodiment 2

[0037] An Ag-MOF / AuNRs nanocomposite material, the preparation method adopted is the same as that of Example 1 except that the silver source solution used is a silver nitrate solution.

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