ATR8300-1064 high sensitive near-infrared microRaman spectrometer was used to rapidly identify textile components

author: Otis

2022-12-01

At present, clothes, bedding and textile toys, supplies used textile materials such as cotton, polyester, silk, because there are huge economic interests, there exist in the market to polyester cotton as cotton, polyester, nitrile posing as pure hair shoddy behavior, the traditional detection method need to use destructive sampling, the test samples to the laboratory, then chromatography or other destructive analysis methods, time-consuming and need chemical reagents, for the scene of counterfeit, judgment is difficult.
Raman spectroscopy is a new rapid, non-destructive means of analysis. When the sample is irradiated by the low-power laser, the Raman signal of the sample is excited. Because the Raman spectrum is a "fingerprint" characteristic spectrum, the properties of the sample can be quickly identified according to its spectral characteristics, and the analysis speed is only tens of seconds, especially suitable for the rapid identification and anti-counterfeiting. The traditional 785nm or visible laser Raman, because of the interference of high fluorescent substances such as dyes added to textiles, makes the rapid detection of textiles is somewhat difficult. In this paper, a Raman spectrometer using 1,064 n m excitation was tested and rapidly identified from a common blended textile of whole cotton, polyester fibers, and cotton and polyester fibers.

Figure 1 Physical diagram of ATR8100-1064, ATR8200-1064, ATR8300-1064 Raman spectrometer,in which ATR8100-1064 is the basic type, ATR8200-1064 is Raman spectrometer with automaticfocusing function, ATR8300-1064 is Raman spectrometer with Raman imaging, and the shape of the three models is exactly the same.

Results and Discussion

Figure 2. The Raman spectra of 100% cotton

Figure 3 Raman spectra of 100% polyester fibers

Figure 4 Raman spectrum of 60.4% cotton + 39.6% polyester fiber

ATR8100-1064, polyester fibers and hybrid textiles were tested using a 1064nm excited ATR8100-1064, ATR8200-1064 (auto-focus type), ATR8300-1064 (microRaman spectrometer with Mapping Raman imaging function). Figures 2,3, and 4 are the Raman spectra of 100% cotton, 100% polyester fiber, and 60.4% cotton + 39.6% polyester fiber, respectively. Raman spectra of 100% cotton and 100% polyester fibers. The Raman peaksof all three spectrographs are sharp. Raman characteristic peaks between 100% cotton and 100% polyester. The main Raman peaks in Figure 3 and Figure 4 are consistent, but after the analysis and comparison of the two spectrographs, it was found that the cotton
Raman signal appeared in Figure 4 at 370,440, and 1373 cm-1. Because the polyester fiber is much stronger than the Raman signal of cotton, the Raman characteristic peak of cotton in Figure 4 is relatively weak. Then cotton and polyester fibers based on the Raman characteristic peak position and peak intensity. 785nm is a relatively general excitation light source. Here are some examples of Raman spectrometer (ATR8300) to detect textile fibers. Raman spectra of 100% whole cotton samples measured at 785nm in red and the 1064nm tested by Raman in blue. It can be seen that more characteristic peaks appear in the Raman spectrum at 1064nm, providing a better basis for both the qualitative analysis of the sample and the quantitative analysis of the latter one.

Figure 5 The Raman spectra of ATR8300 (red line) and ATR8300-1064 (blue line) were
measured in 100% total cotton samples. ATR8300-1064 undoubtedly has more characteristic peaks, providing a better basis for both the qualitative sample and the quantitative analysis of the latter one

For some textile fiber samples with added dye, 1064nm is more advantageous. The following figure is a sample of a polyester fiber, colored brown with the added dye. Upon excitation at 785nm, strong fluorescence interference was generated and few Raman characteristic peaks were detected. However, at 1064nm, very typical characteristic Raman peaks are presented. Its 1610cm-1 polyester fiber peak has clearly and significantly characteristic peaks, whereas the contrast 785nm excitation does not see
any characteristic peaks completely.

Figure 7 Physical diagram of ATR8100, ATR8200 and ATR8300 microscopic Raman spectrometer, in which ATR8100 is basic, ATR8200 is microscopic Raman spectrometer with automatic focus function, and ATR8300 is microscopic Raman spectrometer with Raman imaging. The three models are exactly the same

Table 1 Selection table of Raman spectrometer. The shapes of the 6 models are exactly the same

Model	Excitation wavelength	Feature
ATR8100	785nm	Fundamental from
ATR8100-1064	1064nm	Fundamental from
ATR8200	785nm	With the auto-focus function
ATR8200-1064	1064nm	With the auto-focus function
ATR8300	785nm	With automatic focus (Z axis), automatic 2 D scanning (X, Y axis) Raman imaging function
ATR8300-1064	1064nm