Biomineralization of a titanium-modified hydroxyapatite semiconductor on conductive wool fibers

DOI: 10.1039/C7TB00211D

Authors: Alessio Adamiano (Institute of Science and Technology for Ceramics (ISTEC), National Research Council) , Nicola Sangiorgi (Institute of Science and Technology for Ceramics (ISTEC), National Research Council) , Simone Sprio (Institute of Science and Technology for Ceramics (ISTEC), National Research Council) , Andrea Ruffini (Institute of Science and Technology for Ceramics (ISTEC), National Research Council) , Monica Sandri (Institute of Science and Technology for Ceramics (ISTEC), National Research Council) , Alessandra Sanson (Institute of Science and Technology for Ceramics (ISTEC), National Research Council) , Pierre Gras (CIRIMAT, Université de Toulouse; Université de Toulouse) , David Grossin (CIRIMAT, Université de Toulouse) , Christine Francés (Université de Toulouse) , Konstantinos Chatzipanagis (University of York) , Matthew Bilton (University of York) , Bartosz Marzec (University of Leeds) , Alessio Varesano (CNR-ISMAC, Institute for Macromolecular Studies) , Fiona Meldrum (University of Leeds) , Roland Kroger (University of York) , Anna Tampieri (Institute of Science and Technology for Ceramics (ISTEC), National Research Council)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of Materials Chemistry B

State: Published (Approved)
Published: July 2017
Diamond Proposal Number(s): 10137

Abstract: Metal ions are frequently incorporated into crystalline materials to improve their electrochemical properties and to confer new physicochemical properties. Naturally-occurring phosphate apatite, which is formed geologically and in biomineralization processes, has extensive potential applications and is therefore an attractive functional material. In this study, we generate a novel building block for flexible optoelectronics using bio-inspired methods to deposit a layer of photoactive titanium-modified hydroxyapatite (TiHA) nanoparticles (NPs) on conductive polypyrrole(PPy)-coated wool yarns. The titanium concentration in the reaction solution was varied between 8-50 mol% with respect to the phosphorous, which led to titanate ions replacing phosphate in the hydroxyapatite lattice at levels up to 17 mol%. PPy was separately deposited on wool yarns by oxidative polymerization, using two dopants: (i) antraquinone-2-sulfonic acid to increase the conductivity of the PPy layer and (ii) pyroglutamic acid, to reduce the resistivity of the wool yarns and to promote the heterogeneous nucleation of the TiHA NPs. A specific titanium concentration (25 mol% wrt P) was used to endow the TiHA NPs on the PPy-coated fibers with a desirable band gap value of 3.68 eV, and a specific surface area of 146 m2/g. This is the first time that a thin film of a wide-band gap semiconductor has been deposited on natural fibers to create a fiber-based building block that can be used to manufacture flexible electronic devices.

Journal Keywords: titanium doping; calcium phosphate nanoparticles; wide band gap semiconductor; 22 flexible electronics; biomineralization

Diamond Keywords: Semiconductors

Subject Areas: Chemistry, Materials, Physics


Instruments: I11-High Resolution Powder Diffraction

Added On: 20/07/2017 10:19

Documents:
C7TB00211D.pdf

Discipline Tags:

Physics Physical Chemistry Electronics Energy Materials Chemistry Materials Science Metallurgy

Technical Tags:

Diffraction X-ray Powder Diffraction