Table 2 Represent the functional groups present in lime peel extract and the observed stretching vibrations modes estimated from FTIR and Raman spectroscopic investigations of lime peel extract based thin films.

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Wave number (cm−1)

Bond

Functional group

849.15

C–Cl

Alky halides

1134.31

C–O–R

Ether linkage

1385.48

–CH2– and –CH3

Aliphatic chains

1488.63

C–O

Alcohols, carboxylic acid, ester

1591.65

C–H

Flavonoid

1685.18

C=O

Carbonyl

1735.67

 

Cellulose

3019.76

C–H

Alkanes

3415.22

–OH

Carbohydrates

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