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Directional emission scintillator controlled by surface plasmon

A surface plasmon and scintillator technology, used in the field of nuclear radiation detection, can solve the problem that metal particles cannot be directly applied, and achieve the effects of improved luminous intensity, high sensitivity and signal-to-noise ratio

Inactive Publication Date: 2016-08-24
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, individual metal particles cannot be directly applied in nuclear radiation detection

Method used

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  • Directional emission scintillator controlled by surface plasmon
  • Directional emission scintillator controlled by surface plasmon
  • Directional emission scintillator controlled by surface plasmon

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The selected substrate in this embodiment is a silicon wafer, the period of the metallic silver columnar array on the silicon wafer is 300 nm, the diameter of the metallic silver is 140 nm, and the height of the metallic silver is 90 nm. The plastic scintillator is 1 micron thick.

[0027] The sample preparation process is as follows:

[0028] 1. Preparation of metallic silver columnar array:

[0029] (1) Soft template preparation. Perfluorooctyltrichlorosilane was prepared on the hard template by the liquid phase method, so that the surface of the hard template used for nanoimprinting and the surface of the inner wall of the microstructure self-assembled to form a single-molecule anti-adhesive layer, which has a low The free energy is conducive to demoulding; the PDMS (60wt%) diluted in toluene is spin-coated on the surface of the nanoimprint template after anti-sticking treatment, then baked at 120 degrees Celsius for 20 minutes, and demoulding when it is lowered to...

Embodiment 2

[0044] The directional emission scintillator controlled by surface plasmons includes a silicon chip as a base layer, a metal periodic array structure arranged on the base layer, and a plastic scintillator arranged on the metal periodic array structure. The metal periodic array is an array formed by columnar metal aluminum units distributed periodically in a triangular structure. The distance between the adjacent metal aluminum units is 280nm, the diameter of the metal aluminum unit is 0.4 of the distance between the adjacent metal aluminum units, and the height of the metal aluminum unit is 80nm. The plastic scintillator covers the metal periodic array structure with a height of 1 μm. The plastic scintillator is a plastic matrix doped with a luminescent agent and a wave-shifting agent. In the embodiment, the plastic matrix is ​​polymethylstyrene, and the luminescent agent is a couplet three Benzene, the wave shifting agent is BBO.

Embodiment 3

[0046] The directional emission scintillator controlled by surface plasmons includes quartz glass as a base layer, a metal periodic array structure arranged on the base layer, and a plastic scintillator arranged on the metal periodic array structure. The metal periodic array is an array formed by columnar metal silver units distributed periodically in a square shape. The distance between adjacent metal silver units is 300nm, the diameter of the metal silver unit is 0.5 of the distance between adjacent metal silver units, and the height of the metal silver unit is 90nm. The plastic scintillator is covered on the metal periodic array structure with a height of 2 μm. The plastic scintillator is a plastic matrix doped with a luminescent agent. In the embodiment, the plastic matrix is ​​polymethyl methacrylate, and the luminescent agent is PBD.

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Abstract

The invention relates to a directional emission scintillator controlled by a surface Plasmon, comprising a base layer, a metal periodic array structure arranged on the base layer, and a plastic scintillator arranged on the metal periodic array structure. Compared with the prior art, the directional emission scintillator can be applied to thicker samples (with the maximum thickness up to 3 microns), which is beneficial to significant increase in the luminous intensity; and the directional emission scintillator can achieve higher sensitivity and signal-to-noise ratio in system application, and is of great significance to radiation detection application.

Description

technical field [0001] The invention belongs to the field of nuclear radiation detection, in particular to a directional emitting scintillator regulated by surface plasmons. Background technique [0002] Plastic scintillators are of great use in nuclear radiation detection systems. Because their components contain a large amount of hydrogen, neutrons can be measured by using their nuclear recoil method. At the same time, due to their low density, they are less sensitive to gamma rays. Low, so plastic scintillators are especially suitable for neutron discrimination measurements in the background of gamma rays. Usually, in order to improve the discrimination ability, thin-film plastic scintillators need to be used. However, the biggest weakness of thin-film scintillators is the low efficiency caused by their low luminous efficiency. The light emission of the planar scintillator has no specific orientation, and it belongs to the Lambertian emitter that satisfies the cosine fun...

Claims

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Application Information

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IPC IPC(8): G01T1/203
CPCG01T1/203G01T1/2033
Inventor 刘波程传伟陈鸿顾牡刘金良陈亮欧阳晓平
Owner TONGJI UNIV
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