Application of PLA/GO/ZnO and PLA/GO/Cu₂O as sensor

Area of Science:

• Materials Science
• Computational Chemistry
• Nanotechnology

Background:

• Graphene oxide (GO) modification enhances polylactic acid (PLA) properties.
• Metal oxide interactions with PLA/GO are crucial for developing novel sensing materials.

Purpose of the Study:

• To investigate the interaction schemes between PLA/GO and metal oxides (ZnO, Cu2O).
• To evaluate the sensing capabilities of PLA/GO/ZnO and PLA/GO/Cu2O composites for various gases.

Main Methods:

• Density Functional Theory (DFT) calculations at the B3LYP/LANL2DZ level.
• Calculation of total dipole moment (TDM), HOMO/LUMO energy gap (ΔE), and molecular electrostatic potential (MESP).
• Analysis of adsorption energies, density of states (DOS), and partial density of states (PDOS).

Main Results:

• PLA/GO interacted with ZnO via an O-atom, forming a PLA/GO/OZn composite.
• Both PLA/GO/OZn and PLA/GO/Cu2O composites showed favorable interaction with humidity (H2O).
• PLA/GO/OZn exhibited higher adsorption energy and TDM, indicating greater polarity, while PLA/GO/Cu2O had a larger energy gap.

Conclusions:

• Both PLA/GO/OZn and PLA/GO/Cu2O composites demonstrate good sensing capabilities, especially for H2O.
• The electronic properties and density of states suggest potential for advanced gas sensing applications.
• The study provides insights into the molecular interactions governing the performance of these novel composite materials.