Formation of TiO2 nanostructures modified Eumelanin films with enhanced properties for biopolymer implementations

THIN SOLID FILMS

卷:712

Article

Ali, Mushtaq^1,2  Saad, Muhammad³  Abbas, Mamatimin⁴  Bhatti, Arshad S.⁵  Ottaviano, Luca¹  Ambrico, Marianna⁶  Di Cicco, Andrea⁷  Gunnella, Roberto^7,8 

[1] Univ Aquila, Dipartimento Sci Fis & Chim DSFC, Via Vetoio 10, I-67100 Laquila, Italy

[2] HITEC Univ, Dept Phys, Taxila Cantt, Pakistan

[3] Kazan Fed Univ, Inst Phys, Kazan 420008, Russia

[4] Univ Bordeaux, Lab Integrat Mat Syst IMS, Bordeaux INP, CNRS,UMR 5218, 16 Ave Pey Berland, F-33607 Pessac, France

[5] COMSATS Univ Islamabad, Dept Phys, Islamabad 45550, Pakistan

[6] CNR, Ist Nanotecnol, Via Amendola 122-D, I-70126 Bari, Italy

[7] Univ Camerino, Sch Sci & Technol, Via Madonna Carceri, I-62032 Camerino, MC, Italy

[8] Ist Nazl Fis Nucl, Sez Perugia, Via A Pascoli, I-06123 Perugia, Italy

关键词: Hybrid nanostructures;    Absorption features;    Spectroscopy;    Optoelectronics;   

DOI  :  10.1016/j.tsf.2020.138306

来源: Elsevier

【 摘 要 】

Thin films of hybrid melanin-TiO2 nanoparticles (eumelanin: TiO2) deposited from solution by electro-spray were accurately inspected to unveil modified structural and electronic properties for device implementations. Based on the reorganization of the melanin electronic valence orbital, among other interesting behaviors, we observed up to a two orders increase in the absorption coefficient in the visible range. Furthermore the red-shifted absorption features, disclose that the extended pi-stacking of oligomers is mainly responsible for the tunability of the optical gap as confirmed by photoluminescence. TiO2 nanostructures via oxidative polymerization, further improve the oligomeric character observed by means of Raman scattering. Finally, the photocatalytic activity of TiO2 nanoparticles helps the saturation of shallow trap states in melanin structure and consequently enhances the charge carrier transport.

【 授权许可】

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