Powder sample preparation method for low-temperature fluorescence test

Abstract

The invention discloses a powder sample preparation method for a low-temperature fluorescence test. The powder sample preparation method comprises steps that: 1) a double-sided conductive copper adhesive tape is adhered on the black paper; 2) the powder sample is adhered on the double-sided conductive copper adhesive tape; 3) a tabletting die of an infrared spectrometer and a manual tabletting machine are used for pressing for 1-2 min under the pressure of 5 MPa; 4) a grinding tool is taken out to obtain a sample piece, and an uncompacted powder sample is blown off by using an ear washing ball; 5) the base of the sample piece strip is fixedly disposed on the center of the clamp. According to the invention, expensive and fragile quartz plates are not required in the whole sample preparationprocess, so that the experiment cost is saved, the difficulty in mounting samples is reduced, and the experiment safety is improved; secondly, the stray light can be greatly reduced after the powderis tabletted, so that interference factors of fluorescence signals are reduced; finally, after the powder is pressed into tablets, the optical density incident to the surface of the sample is greatlyimproved, the fluorescence intensity of the sample with weak fluorescence signal can be improved, and the slit can be reduced to improve the resolution of the fluorescence spectrum of the sample withstrong fluorescence signal.

Description

[0001] 【Technical field】 [0002] The invention belongs to the technical field of powder sample testing, and relates to a powder sample preparation method for low-temperature fluorescence testing. [0003] 【Background technique】 [0004] The steady-state transient fluorescence spectrometer is an instrument used to characterize the photoluminescence characteristics and luminescence lifetime of substances. After connecting to a low-temperature device, it can test the detailed information of the research object during the temperature change process. The fluorescence spectrometers of different companies may be equipped with different refrigeration systems. The Oxford DN liquid nitrogen closed-cycle temperature control system is a very commonly used refrigeration system. Its controllable temperature range is 77K to 300K. Sample test or liquid sample drop test after volatilization on the quartz plate. For the test of powder samples, we can only choose to disperse in solvent and then...

AI Technical Summary

Problems solved by technology

But for the equipment, the temperature change is likely to cause the samples dropped on the quartz plate or sandwiched in the quartz plate to scatter in the refrigeration system, and these scattered powders cannot be taken out, thus causing contamination of the cryogenic system

For the test, since the installation of the DN itself determines that the position of the sample cannot be adjusted, if the thickness of the sample sheet is large, the optical path will deviate from the sample, and the collected fluorescence signal will be inaccurate. Therefore, it is impossible to use ultra-thin quartz sheet (0.2 mm), such as 1.5mm thick ordinary glass slide

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