Table 7 Various used materials for reducing band gap energy.

From: Structural, spectroscopic, morphological and optical studies of new polymer composite based on polystyrene inserted with natural bitumen

Sample

Optical energy gap

references

PS + Ni

4.54-3.91 eV

80

PS + Sn\(\:{\varvec{L}}_{2}\)

4.5-4.32 eV

81

PS + CNT

4-2 eV

82

PS + BST

4.16-3.47 eV

7

PS/ZnO nanocomposite

4.45 −3.09 eV

83

Ps + Barium titanate

4.4–3.2 eV

84

PS: Cu

4.05–3.65 eV

57

PS: Bitumen

4.34–1.14 eV

Present study

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