Mesoporous TiO2 as a nanostructured inorganic polymer thin film applied for a wide range ammonia concentration analyzer based on photoelectrochemical reaction

Recent advances in nanotechnology allow the fabrication of structures down to the nanometer range. Various theoretical and experimental studies on the characteristics of fluid in nanochannels have been carried out in recent years. The results show that transport phenomena in nanoscale promise a wide range of applications in biological and chemical analysis. Practical applications require fabrication of nanochannels with a short production time and at a low cost. Polymer is considered as a suitable material for mass production of nanochannels due to the wide range of properties available, as well as the low cost of material and fabrication process. This paper reports the fabrication of planar nanochannels using hot embossing and thermal bonding technique on a polymer thin film. The mold for hot embossing was fabricated on a silicon wafer using photolithography and Reactive Ion Etching (RIE). Polymethylmethacrylate (PMMA) thin film with a thickness of 250 μm was used as the base material to emboss the nanochannels from the silicon mold. Temperature and pressure were controlled and recorded continuously during the embossing process. The channels then were examined by Atomic Force Microscope (AFM) in tapping mode to verify the width and the depth of the channel. Next, another piece of PMMA thin film was bonded to the first piece by thermal bonding process to make closed nanochannels. Temperature and pressure during the bonding process were controlled and recorded. Access to the channels was made on the thin film by a laser cutter before embossing. The results showed that open planar channels with the depth down to 30nm can be fabricated on PMMA thin film with a process time less than 30 minutes. Width and depth of the channels agree well with appropriate dimensions on the mold. Bonding can be achieved within 40 minutes. Closed planar channels with the depth of 300nm were fabricated successfully by a combination of embossing and thermal bonding processes. This project demonstrates the possibility of fabricating nanochannels with low cost and short processing time using polymer material. The processes are suitable not only for nanochannels but also for more complicated nanostructures. The presented technique allows the fabrication of nanodevices with various designs.

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Effect of Illumination on Organic Polymer Thin-Film Transistors

MRS Proceedings ◽

10.1557/proc-771-l10.17 ◽

2003 ◽

Vol 771 ◽

Cited By ~ 3

Author(s):

Michael C. Hamilton ◽

Sandrine Martin ◽

Jerzy Kanicki

Keyword(s):

Thin Film ◽

Thin Film Transistors ◽

Drain Current ◽

Charge Carriers ◽

Electrical Performance ◽

Organic Polymer ◽

Light Illumination ◽

Polymer Thin Film ◽

Channel Region ◽

White Light Illumination

AbstractWe have investigated the effects of white-light illumination on the electrical performance of organic polymer thin-film transistors (OP-TFTs). The OFF-state drain current is significantly increased, while the drain current in the strong accumulation regime is relatively unaffected. At the same time, the threshold voltage is decreased and the subthreshold slope is increased, while the field-effect mobility of the charge carriers is not affected. The observed effects are explained in terms of the photogeneration of free charge carriers in the channel region due to the absorbed photons.

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Wide range modulation of synaptic weight in thin-film transistors with hafnium oxide gate insulator and indium-zinc oxide channel layer for artificial synapse application

Nanoscale ◽

10.1039/d1nr02911h ◽

2021 ◽

Author(s):

Keonwon Beom ◽

Jimin Han ◽

Hyun-Mi Kim ◽

Tae-Sik Yoon

Keyword(s):

Thin Film ◽

Zinc Oxide ◽

Thin Film Transistors ◽

Hafnium Oxide ◽

Synaptic Weight ◽

Drain Current ◽

Gate Insulator ◽

Channel Layer ◽

Indium Zinc Oxide ◽

Wide Range

Wide range synaptic weight modulation with a tunable drain current was demonstrated in thin-film transistors (TFTs) with a hafnium oxide (HfO2−x) gate insulator and an indium-zinc oxide (IZO) channel layer...

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Conducting polymer thin film for optoelectronic devices applications

Polymers for Advanced Technologies ◽

10.1002/pat.5290 ◽

2021 ◽

Author(s):

Mohamed H. Abdel‐Aziz ◽

Mohammed Zwawi ◽

Ahmed F. Al‐Hossainy ◽

Mohamed Sh. Zoromba

Keyword(s):

Thin Film ◽

Conducting Polymer ◽

Optoelectronic Devices ◽

Polymer Thin Film

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Facile synthesis of mesoporous TiO2 film templated by block copolymer for photocatalytic applications

New Journal of Chemistry ◽

10.1039/d1nj02997e ◽

2021 ◽

Author(s):

Olufemi Olatidoye ◽

Daria Thomas ◽

Bishnu Bastakoti

Keyword(s):

Thin Film ◽

Block Copolymer ◽

Ethylene Oxide ◽

Tio2 Thin Film ◽

Polymeric Micelles ◽

Polymeric Micelle ◽

Mesoporous Tio2 ◽

Facile Synthesis ◽

Vinyl Pyridine ◽

Photocatalytic Applications

A facile synthesis of a mesoporous TiO2 thin film is reported using poly(styrene-2-vinyl pyridine-ethylene oxide) polymeric micelle as a synthetic template. As the Ti precursor strongly binds with polymeric micelles...

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A Theoretical Study on an Elastic Polymer Thin Film-Based Capacitive Wind-Pressure Sensor

Polymers ◽

10.3390/polym12092133 ◽

2020 ◽

Vol 12 (9) ◽

pp. 2133

Author(s):

Xue Li ◽

Jun-Yi Sun ◽

Bin-Bin Shi ◽

Zhi-Hang Zhao ◽

Xiao-Ting He

Keyword(s):

Thin Film ◽

Closed Form ◽

Pressure Sensor ◽

Closed Form Solution ◽

Form Solution ◽

Wind Pressure ◽

Polymer Thin Film ◽

Movable Electrode ◽

Elastic Polymer ◽

Electrode Plate

This study is devoted to the design of an elastic polymer thin film-based capacitive wind-pressure sensor to meet the anticipated use for real-time monitoring of structural wind pressure in civil engineering. This sensor is composed of four basic units: lateral elastic deflection unit of a wind-driven circular polymer thin film, parallel plate capacitor with a movable circular electrode plate, spring-driven return unit of the movable electrode plate, and dielectric materials between electrode plates. The capacitance of the capacitor varies with the parallel move of the movable electrode plate which is first driven by the lateral elastic deflection of the wind-driven film and then is, after the wind pressure is reduced or eliminated, returned quickly by the drive springs. The closed-form solution for the contact problem between the wind-driven thin film and the spring-driven movable electrode plate is presented, and its reliability is proved by the experiment conducted. The numerical examples conducted show that it is workable that by using the numerical calibration based on the presented closed-form solution the proposed sensor is designed into a nonlinear sensor with larger pressure-monitoring range and faster response speed than the linear sensor usually based on experimental calibration.

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