Near-infrared detection colorimetric sensor as well as preparation method and application thereof

A colorimetric sensor and near-infrared detection technology, which is applied in the field of nanomaterials and functional polymer materials, can solve the problems of influence, loss of photothermal effect, destruction, etc., and achieve excellent stability

Inactive Publication Date: 2020-11-03
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

And the common method of preparing gold nanorods is the seed growth method. The bimolecular layer formed by cetyltrimethylammonium bromide (CTAB) can stabilize the prepared gold nanorods. It will be destroyed in solution or anhydrous state, causing the protected gold nanorods to aggregate and lose the photothermal effect, thus affecting its function
In addition, it is difficult for the human eyes to detect the change of traditional response materials in the process of responding to stimuli. It is necessary to introduce a color-changing material to display the response results.
[0004] Stimuli-responsive materials are widely used in the field of smart windows as smart regulating materials, but most smart windows require continuous energy (such as electric energy, magnetic energy, etc.) supply to realize the regulating function, which does not conform to the principle of energy saving

Method used

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  • Near-infrared detection colorimetric sensor as well as preparation method and application thereof
  • Near-infrared detection colorimetric sensor as well as preparation method and application thereof
  • Near-infrared detection colorimetric sensor as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Example 1 Preparation of PEG-thiol-Au NRs

[0043] (1) CTAB stable gold nanorods:

[0044] Combine 365mg CTAB, 10mL H 2 O and 100μL HAuCl 4 The solution (25mM) is mixed and stirred vigorously at room temperature (> 1200rpm); then, add 0.6mL NaBH 4 The ice water solution (10mM) was quickly added to the above mixture solution, stirred for 2 minutes, and aged for 2 hours to obtain the gold seed solution;

[0045] Then grow gold nanorods: first dissolve 3.65g CTAB in 100mL water and then add 0.8mL silver nitrate solution (10mM), 0.2mL hydrochloric acid (1M), 2.0mL chloroauric acid solution (25mM) and 0.7mL ascorbic acid (78.8mM). ), after stirring the above solution for 30 seconds, quickly add 120 μL of gold seed solution. The mixture was stirred for 30 seconds, and then held at 29°C overnight. After centrifugation at 9000 rpm for 10 minutes, the collected solids were dispersed in 5 mL of ultrapure water to obtain a gold nanorod dispersion with a CTAB stable aspect ratio of 5.

...

Embodiment 2

[0051] Example 2 Preparation of near-infrared detection colorimetric sensor

[0052] (1) Preparation of polystyrene photonic crystals:

[0053] Photonic crystals are prepared by vertically depositing polystyrene colloid on a glass substrate. The cleaned glass substrate was placed vertically in a polystyrene colloidal suspension with a diameter of 194 nm at a concentration of 0.15 wt%. Then, by placing the reaction system in a constant temperature and humidity cabinet (50° C. and 60% relative humidity) for 24 hours, a glass plate on which photonic crystals were grown was prepared.

[0054] (2) Preparation of colorimetric sensor for near infrared detection:

[0055] Disperse 0.08mL PEG-thiol-Au NRs in 0.32mL prepolymer solution (N-isopropylacrylamide: acrylamide ratio is 90:10) and stir for 30min, and then cover the glass plate with photonic crystals. Layer glass plate, clamped and immersed in the mixed solution, the mixed solution is immersed by the capillary force generated by the g...

Embodiment 3

[0058] Example 3 Detection of near-infrared light by near-infrared detection colorimetric sensor

[0059] The near-infrared detection colorimetric sensor prepared from the prepolymerized solution of N-isopropyl acrylamide: acrylamide ratio of 90:10 was placed under a micro-fiber spectrometer to measure its reflection spectrum, and then irradiated with near-infrared light (2W). After 3 seconds, a significant blue shift (17nm) occurs at the maximum reflection wavelength, such as figure 2 .

[0060] Table 1 Composition and responsiveness of near-infrared response colorimetric sensors

[0061]

[0062]

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Abstract

The invention discloses a near-infrared detection colorimetric sensor as well as a preparation method and application thereof, and belongs to the technical field of nano materials and functional polymer materials. According to the preparation method, gold nanorods are used as near-infrared light response components, and sulfydryl-terminated polyethylene glycol is used for replacing CATB, so that sulfydryl-terminated polyethylene glycol-stabilized gold nanorods are obtained; then the polystyrene photonic crystals are dispersed into a prepolymer solution of Nisopropylacrylamide and acrylamide, then a mixed solution of the prepolymer solution is soaked into the polystyrene photonic crystals, and photo-initiation polymerization is carried out to form hybrid gel, so as to obtain the near-infrared detection colorimetric sensor. The obtained colorimetric sensor can generate an obvious detection signal changing from green to white after being irradiated by near-infrared light with specific wavelength for 2-8 seconds, so that the detection of 808-830nm near-infrared light is realized, the detection stability is excellent, the colorimetric sensor can be recycled for more than 100 times, thecolorimetric sensor can also respond to change into an opaque state, and the passive cooling is realized.

Description

Technical field [0001] The invention belongs to the technical field of nanomaterials and functional polymer materials, and particularly relates to a near-infrared detection colorimetric sensor and a preparation method and application thereof. Background technique [0002] Photonic crystals are characterized by a periodic dielectric structure, which is composed of materials with different refractive indices, thereby realizing a photonic band gap and visually perceivable colors. If photonic crystals are composed of responsive polymers, their maximum reflection wavelength (PBG) and visually perceptible color will change when the relevant stimulus is detected. Among various responsive polymers, poly(N-isopropylacrylamide) (PNIPAm) has a lower critical solution temperature (LCST) behavior and is used as a common temperature-responsive material. However, due to the water in the gel The temperature-sensitive hydrogel has a high specific heat capacity, and the temperature-sensitive hydr...

Claims

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Application Information

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IPC IPC(8): G01N21/25G01N21/359C08F220/54C08F220/56C08K9/04C08K7/00C08K3/08C08J3/075C08L33/24
CPCC08F220/54C08J3/075C08J2333/24C08K3/08C08K7/00C08K9/08C08K2003/0831C08K2201/011G01N21/25G01N21/359C08F220/56
Inventor 陈明清肖鑫王逸施冬健李小杰
Owner JIANGNAN UNIV
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