Differential Raman Spectroscopy Visualization and Rapid Identification of Shoe Sole Materials

Category	Main ingredient	Sample serial number
1	EVA	1^#,3^#,8^#,9^#,10^#,11^#,12^#,14^#,16^#,17^#,18^#,20^#,21^#,22^#,23^#,24^#,26^#,27^#,28^#,29^#,31^#,32^#,33^#,35^#,39^#,43^#,44^#,45^#,50^#
2	NR	2^#,4^#,7^#,13^#,19^#,25^#,30^#,36^#,46^#,51^#
3	PVC	5^#,34^#,40^#,41^#,42^#,49^#
4	BR	6^#,15^#,37^#,38^#,47^#,48^#

Table 2. Vibration group information of four types of samples

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Table 2. Vibration group information of four types of samples

Ingredient	Peak/cm^-1	Vibration attribution
EVA	633	-C=O stretching vibration
	814,1059,1127	C-C stretching vibration
	1296	-CH₂ non-planar rocking vibration
	1370	-CH₃ symmetrical deformation vibration
	1435	-C-H shear vibration in CH₂
NR	294,349,516	C-C-C stretching vibration
	1210	C-C stretching vibration
	1261	-CH₂ in-plane deformation
	1369	-CH₃ and-CH₂ in-plane deformation
	1652	Trans C=C double bond stretching vibration
PVC	634,680	C-Cl stretching vibration
	1082	C-C stretching vibration
	1303	C-H bond asymmetric swing vibration
	1436	C-H bond bending vibration characteristic peak
BR	282,452	C-C-C stretching vibration
	985	C-C stretching vibration
	1437	-C-H stretching vibration in CH₂
	1652	Trans C=C stretching vibration

Table 3. Decision tree classification results of four types of shoe sole samples
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Table 3. Decision tree classification results of four types of shoe sole samples
Practical testing 1 2 3 4 Classification accuracy/%
1 29 0 0 0 100
2 0 10 0 0 100
3 0 0 6 0 100
4 0 0 1 5 83.3
Overall classification accuracy/% 56.9 19.6 13.7 9.8 98.0

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Jin Zhang, Hong Jiang, Feng Liu, Bin Duan. Differential Raman Spectroscopy Visualization and Rapid Identification of Shoe Sole Materials[J]. Laser & Optoelectronics Progress, 2021, 58(8): 0830004

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