Synthesis and evaluation of a PVDF–PT3MA–Zn2SiO4:Mn hybrid polymeric composite for optical device applications

Abstract

A new hybrid organic/inorganic composite consisting of poly(3-thiophene methyl acetate) (PT3MA), poly(vinylidene fluoride) (PVDF) and manganese-doped zinc silicate (Zn 2 SiO 4 :Mn) has been synthesized and applied for the fabrication of an optical device. Recrystallized PVDF was used as a host matrix for the PT3MA polymer and Zn 2 SiO 4 :Mn inorganic compound. The active layer was deposited on an indium-tinoxide (ITO)-coated glass substrate by the drop casting technique. A spin-coating method was also used for morphological comparison purposes. The synthesized material as well as the device (aluminium electrodes/PVDF-PT3MA-Zn 2 SiO 4 :Mn/ITO/glass) was characterized by scanning electron microscopy (SEM), atomic force microscopy (AFM), energy dispersive X-ray spectroscopy (EDX), dark current-voltage (I-V) characteristic curves, absorbance and photoluminescence (PL) spectroscopy. The results show spherical-and irregular-shaped microparticles both dispersed on and within the PVDF matrix, which correspond to PT3MA and Zn 2 SiO 4 :Mn, respectively. The hybrid composite shows strong luminescence at z525 nm superimposed by a broadband between 600 and 800 nm, originating from the Zn 2 SiO 4 :Mn radiative transitions and from the recombination of photogenerated carriers at PT3MA. At room temperature, the device presented semiconductor behaviour typically observed for photodetectors and a DC electrical conductivity of z0.37 mS cm À1.

Poly(3-hydroxybutyrate-co-valerate)/poly(3-thiophene ethyl acetate) blends as a electroactive biomaterial substrate for tissue engineering application

“…However, the incorporation of PTAcEt has led to changes in the supercial texture of the polyester which is evidenced by the appearance of cavities (pores). It is not observed phase separation between PHBV and PTAcEt as that reported by Gomes et al, 41 since both polymers are soluble in chloroform. The cavity size (ranging from 0.1 to 2.3 mmaverage diameter) decreases with the concentration of PTAcEt while the cavity density increases, being more noticeable to the 92 : 8% blend (Fig.…”

Structural designing of Zn2SiO4:Mn nanocrystals by co-doping of alkali metal ions in mesoporous silica channels for enhanced emission efficiency with short decay time

“…When K + ions are introduced in to the Zn 2 SiO 4 :Mn matrix, the PL emission intensity increased and reaches to maximum at molar concentration 0.36 M aer that start deteriorating. We also observed a noticeable "red shi" in the emission peak for the K + doping concentration > 0.06 M. Literature revealed 19,26,29,30 that in Zn 2 SiO 4 :Mn phosphor Mn 2+ ions occupies non-equivalent Zn sites viz., Zn(1) position and Zn(2) position. As a result, two closely spaced luminescence peaks Mn 2+ /Zn(1) ($540 nm) and Mn 2+ /Zn(2) ($526 nm) appeared in the emission spectra and merge in to one broad asymmetric peak cantered at $527 nm.…”

Red-light-emitting polymer composite based on PVDF membranes and Europium phosphor using Buriti Oil as plasticizer

“…Recently, we have published the successful sol-gel synthesis of a silica xerogel containing Ba 2+ and Eu 3+ ions [14] which can also act as precursor to obtain Ba 2 SiO 4 :Eu 3+ red phosphors [15,16]. Besides the red strong emission, Eu 3+ ions can easily be quenched by CO 2 or H 2 O molecules, so the use of a protector as a polymeric matrix is a simple alternative to enhance the Eu 3+ phosphor emission [17].…”