A method and device for enhancing the fluorescence intensity of gold nanospheres

A technology of gold nanospheres and fluorescence intensity, which is applied in the field of nanomaterials and optics, can solve the problems of difficult industrial production, limited enhancement effect, and high cost, and achieve the effects of low cost, enhanced effect, and improved diagnostic accuracy

Active Publication Date: 2021-07-02
SHANXI UNIV
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Problems solved by technology

These methods all have certain limitations. For example, the acquisition of dimers requires precise operation of large-scale scientific instruments, which is expensive, complicated to operate, and difficult to be used in industrial production; and the addition of other noble metals has limited enhancement effect on the fluorescence of gold nanoparticles. Can only increase the fluorescence intensity of gold nanoparticles by 20 times

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  • A method and device for enhancing the fluorescence intensity of gold nanospheres
  • A method and device for enhancing the fluorescence intensity of gold nanospheres
  • A method and device for enhancing the fluorescence intensity of gold nanospheres

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Embodiment 2

[0026] A method for enhancing the fluorescence intensity of gold nanospheres in this embodiment comprises the following steps:

[0027] 1) Preparation of agglomerated gold nanosphere sample 4:

[0028] A piece of cover glass was taken, washed with acetone, potassium hydroxide and deionized water respectively, and the gold nanosphere solution was spin-coated on the cover glass by spin coating method to prepare agglomerated gold nanosphere sample.

[0029] The thickness of the cover glass is 0.17 mm.

[0030] The gold nanospheres are prepared by a seed-mediated growth method, the obtained gold nanospheres have a diameter of about 160 nanometers, and the optical density of the gold nanosphere solution used for spin coating is 0.005.

[0031] The specific parameters of the spin-coating method are: 1. first spin-coating with a speed of 500 rpm for 10 seconds; 2. then spin-coating with a speed of 2000 rpm for 20 seconds; Second.

[0032] figure 2 The transmission electron micro...

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Abstract

The invention belongs to the field of nanometer material and optics. A method for enhancing the fluorescence intensity of gold nanospheres. Continuous laser light is focused on the aggregated gold nanosphere particles (4) with a diameter of 150-170 nm to excite the aggregated gold nanosphere particles (4) to obtain gold nanosphere fluorescence. Gold nanospheres The spherical fluorescence increased with the increase of laser irradiation time, and the best enhancement effect was obtained when the laser irradiation time reached 4.5 seconds, and then weakened with the increase of laser irradiation time. The invention also relates to a device for enhancing the fluorescent intensity of the agglomerated gold nanospheres by continuous laser irradiation. The present invention irradiates the agglomerated gold nanospheres with near-ultraviolet continuous laser light, so that adjacent gold nanospheres can produce a welding effect under the action of the photothermal effect, and then produce a very strong local surface plasmon enhancement effect, so that the fluorescence intensity of the gold nanospheres Enhanced by more than 150 times.

Description

technical field [0001] The invention belongs to the field of nanomaterials and optics, and specifically relates to a method and a device for enhancing the fluorescence intensity of agglomerated gold nanospheres irradiated by continuous laser light. Background technique [0002] Noble metal nanoparticles, such as gold nanospheres, have unique physical and chemical properties, such as excellent photothermal properties, excellent stability, biological non-toxicity, efficient catalytic properties and biocompatibility, making them widely used in many fields. have a wide range of applications. In particular, the localized surface plasmon enhancement effect of gold nanoparticles enables it to greatly enhance the linear and nonlinear optical responses of materials adjacent to gold nanoparticles (usually around 10 nanometers), and has been applied on the surface Enhanced Raman spectroscopy, two-photon fluorescence, double frequency acquisition and other scientific research and daily...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/64
CPCG01N21/64G01N2021/6417
Inventor 秦成兵张晓荣张国锋高岩陈瑞云肖连团贾锁堂
Owner SHANXI UNIV
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