scholarly journals Electrosynthesis of Biocompatible Free-Standing PEDOT Thin Films at a Polarised Liquid|Liquid Interface

2021 ◽  
Author(s):  
Rob A. Lehane ◽  
Alonso Gamero-Quijano ◽  
Sigita Malijauskaite ◽  
Angelika Holzinger ◽  
Michele Conroy ◽  
...  
Keyword(s):  
Thin Films ◽  
Single Step ◽  
Liquid Interface ◽  
Cellular Growth ◽  
Ambient Conditions ◽  
Free Standing ◽  
Electrochemical Transistor ◽  
Solid Substrates ◽  
Energy Conversion And Storage ◽  
Biomedical Technologies

The versatility of conducting polymers (CPs) facilitates their use in energy conversion and storage, sensor, and biomedical technologies, once processed into thin films. Hydrophobic CPs, like poly(3,4-ethylenedioxythiophene) (PEDOT), typically require the use of surfactant additives, such as poly(styrenesulfonate) (PSS), to aid their aqueous processability as thin films. However, excess PSS diminishes CP electrochemical performance, biocompatibility, and device stability. Here, we report the electrosynthesis of PEDOT thin films at a polarised liquid|liquid interface, a method non-reliant on conductive solid substrates that produces free-standing, additive-free, biocompatible, easily transferrable, and scalable 2D PEDOT thin films of any shape or size in a single-step at ambient conditions. We demonstrate the PEDOT thin film’s superior biocompatibility as scaffolds for cellular growth, opening immediate applications in organic electrochemical transistor (OECT) devices for monitoring cell behaviour over extended time periods, bio-scaffolds and medical devices, without the requirement for physiologically unstable and poorly biocompatible PSS.

Growth of nanocrystals and thin films at the water–oil interface

2010 ◽  
Vol 368 (1927) ◽  
pp. 4313-4330 ◽  
Author(s):  
G. L. Stansfield ◽  
P. V. Vanitha ◽  
H. M. Johnston ◽  
D. Fan ◽  
H. AlQahtani ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Thin Films ◽  
Emission Spectroscopy ◽  
Single Step ◽  
X Ray Diffraction ◽  
X Ray ◽  
Cds Nanocrystals ◽  
Transmission Electron ◽  
Solid Substrates ◽  
Absorption And Emission Spectroscopy

The use of the water–oil interface provides significant advantages in the synthesis of inorganic nanostructures. Employing the water–toluene interface, luminescent CdS nanocrystals have been obtained at a relatively modest temperature of 35 ° C. The diameters of the particulates can be varied between 1.0 and 5.0 nm. In addition, we have devised a new method for transferring thin films at the water–toluene interface onto solid substrates. Using this method, thin films consisting of Au and Ag nanocrystals spread over very large areas (square centimetres) are obtained in a single step. These films are directly usable as ingredients of functional devices. We show this by constructing a working amine sensor based on films of Au nanocrystals. The materials obtained have been characterized by X-ray diffraction, scanning and transmission electron microscopy, absorption and emission spectroscopy and charge transport measurements.

Effects of Thermal Annealing Duration on the Film Morphology of Methylamine Lead Triiodide (MAPbI3) Perovskite Thin Films in Ambient Air

2020 ◽  
Vol 20 (6) ◽  
pp. 3795-3801
Author(s):  
Ashwani Kumar ◽  
Nazilla Soleimanioun ◽  
Navjot Singh ◽  
K. L. Singh ◽  
I. S. Sandhu ◽  
...  
Keyword(s):  
Thin Films ◽  
Thermal Annealing ◽  
Ambient Air ◽  
Single Step ◽  
Annealing Duration ◽  
Ambient Conditions ◽  
X Ray Diffraction ◽  
Lead Iodide ◽  
Step Method ◽  
Practical Applications

In the present communication we have studied the effect of thermal annealing duration on morphology of methylamine lead triiodide (MAPbI3) perovskite (prepared using single step method) semiconductor that changes into lead iodide (PbI2). Furthermore, the effect of annealing duration on thin films is investigated and correlated with its potential photovoltaic application. Thin films characteristics study by X-ray diffraction and scanning electron microscopy results indicate MAPbI3 degraded strongly by annealing duration. However, thin films (about 1.25 micron-thick) annealed at 80 °C for 10 min in ambient conditions cause minimum degradation with smooth and uniform surface morphology. It also shows a higher absorption coefficient with the band gap of °1.5 eV rendering this perovskite suitable for practical applications.

scholarly journals An advancement in the synthesis of unique soft magnetic CoCuFeNiZn high entropy alloy thin films

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Chokkakula L. P. Pavithra ◽  
Reddy Kunda Siri Kiran Janardhana ◽  
Kolan Madhav Reddy ◽  
Chandrasekhar Murapaka ◽  
Joydip Joardar ◽  
...  
Keyword(s):  
Thin Films ◽  
Saturation Magnetization ◽  
Functional Materials ◽  
Single Step ◽  
High Entropy Alloy ◽  
High Saturation Magnetization ◽  
Soft Magnetic ◽  
High Entropy ◽  
High Saturation ◽  
Electrochemical Approach

AbstractDiscovery of advanced soft-magnetic high entropy alloy (HEA) thin films are highly pursued to obtain unidentified functional materials. The figure of merit in current nanocrystalline HEA thin films relies in integration of a simple single-step electrochemical approach with a complex HEA system containing multiple elements with dissimilar crystal structures and large variation of melting points. A new family of Cobalt–Copper–Iron–Nickel–Zinc (Co–Cu–Fe–Ni–Zn) HEA thin films are prepared through pulse electrodeposition in aqueous medium, hosts nanocrystalline features in the range of ~ 5–20 nm having FCC and BCC dual phases. The fabricated Co–Cu–Fe–Ni–Zn HEA thin films exhibited high saturation magnetization value of ~ 82 emu/g, relatively low coercivity value of 19.5 Oe and remanent magnetization of 1.17%. Irrespective of the alloying of diamagnetic Zn and Cu with ferromagnetic Fe, Co, Ni elements, the HEA thin film has resulted in relatively high saturation magnetization which can provide useful insights for its potential unexplored applications.

scholarly journals Generating Electricity from Natural Evaporation Using PVDF Thin Films Incorporating Nanocomposite Materials

Energies ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 585
Author(s):  
Ariel Ma ◽  
Jian Yu ◽  
William Uspal
Keyword(s):  
Thin Films ◽  
Graphene Oxide ◽  
Polyvinylidene Fluoride ◽  
Capillary Flow ◽  
Short Circuit ◽  
Current Source ◽  
Nanocomposite Materials ◽  
The Other ◽  
Pvdf Film ◽  
Ambient Conditions

Natural evaporation has recently come under consideration as a viable source of renewable energy. Demonstrations of the validity of the concept have been reported for devices incorporating carbon-based nanocomposite materials. In this study, we investigated the possibility of using polymer thin films to generate electricity from natural evaporation. We considered a polymeric system based on polyvinylidene fluoride (PVDF). Porous PVDF films were created by incorporating a variety of nanocomposite materials into the polymer structure through a simple mixing procedure. Three nanocomposite materials were considered: carbon nanotubes, graphene oxide, and silica. The evaporation-induced electricity generation was confirmed experimentally under various ambient conditions. Among the nanocomposite materials considered, mesoporous silica (SBA-15) was found to outperform the other two materials in terms of open-circuit voltage, and graphene oxide generated the highest short-circuit current. It was found that the nanocomposite material content in the PVDF film plays an important role: on the one hand, if particles are too few in number, the number of channels will be insufficient to support a strong capillary flow; on the other hand, an excessive number of particles will suppress the flow due to excessive water absorption underneath the surface. We show that the device can be modeled as a simple circuit powered by a current source with excellent agreement between the theoretical predictions and experimental data.

scholarly journals Realization of ordered magnetic skyrmions in thin films at ambient conditions

2019 ◽  
Vol 3 (10) ◽  
Author(s):  
Ryan D. Desautels ◽  
Lisa DeBeer-Schmitt ◽  
Sergio A. Montoya ◽  
Julie A. Borchers ◽  
Soong-Geun Je ◽  
...  
Keyword(s):  
Thin Films ◽  
Ambient Conditions ◽  
Magnetic Skyrmions

Polarization-dependence of the Raman response of free-standing strained Ce0.8Gd0.2O2 membranes

2021 ◽  
Author(s):  
Alexander Konetschny ◽  
Marcel Weinhold ◽  
Christian Heiliger ◽  
Matthias Thomas Elm ◽  
Peter J. Klar
Keyword(s):  
Thin Films ◽  
Strain State ◽  
Polarization Dependence ◽  
Raman Mapping ◽  
Free Standing ◽  
Excitation Light ◽  
Oriented Polycrystalline ◽  
Raman Response

Square-shaped Ce0.8Gd0.2O2 (GDC) membranes are prepared by microstructuring techniques from (111)-oriented, polycrystalline GDC thin films. The strain state of the membranes is investigated by micro-Raman mapping using polarized excitation light....

Sign in / Sign up

Export Citation Format

Share Document