scholarly journals Remarkable piezoelectric properties in thin films of cellulose nanofibers after electrochemical poling

2021 ◽  
Author(s):  
Ayesha Sultana ◽  
Md. Mehebub Alam ◽  
Eleni Pavlopoulou ◽  
Eduardo Solano ◽  
Magnus Berggren ◽  
...  
Keyword(s):  
Thin Films ◽  
Piezoelectric Properties ◽  
Low Cost ◽  
Cellulose Nanofibers ◽  
Polyvinylidene Difluoride ◽  
Internet Of Everything ◽  
Crystal Alignment ◽  
Self Powered ◽  
Piezoelectric Voltage ◽  
Piezoelectric Characteristics

Abstract Internet-of-everything (IoE) is defined as networked connections of things, people, data and processes. IoE nodes, preferably shaped as printed flexible systems, serves as the frontier outpost of the Internet and comprises devices to record and regulate states and functions. To power distributed IoE nodes in an ecofriendly manner, technology to scavenge energy from ambience and self-powered devices are developed. For this, piezoelectricity is regarded as a key-property, however current technology typically based on polyvinylidene difluoride (PVDF) co-polymers, are expensive and produced via toxic protocols. We report piezoelectric characteristics of electrochemically poled cellulose nanofiber (CNFs) thin films processed from water dispersions. Poling these films at humid conditions cause breaking and reorientation of CNF segments, which results in enhanced crystal alignment rendering the resulting material piezoelectric. Generators based on poled CNF show similar piezoelectric voltage and coefficient, here measured to d33 = 46 pm/V, as for devices including PVDF copolymer layers of similar thickness. Our findings promise for low cost and printable ecofriendly piezoelectric-powered IoE nodes.

Evaporation-Based Microfluidic Pump Using Super-Hydrophilic Diatom Biosilica Thin Films

2019 ◽  
Author(s):  
Hunter Jarrett ◽  
Micah Wade ◽  
Joseph Kraai ◽  
Gregory L. Rorrer ◽  
Alan X. Wang ◽  
...  
Keyword(s):  
Thin Films ◽  
Relative Humidity ◽  
Capillary Tube ◽  
Low Cost ◽  
Extended Period ◽  
Trace Detection ◽  
Flow Rates ◽  
Pumping System ◽  
Self Powered ◽  
Microfluidic Pumping

Abstract Diatoms are a group of single-celled photosynthetic algae that use biochemical pathways to bio-mineralize and self-assemble three-dimensional photonic crystals with unique photonic and micro- & nano-fluidic properties. In recent years, diatom biosilica has been used in surface-enhanced Raman scattering (SERS) based optofluidic sensors for detection of a variety of chemical and biological molecules. In this paper, we present a study to develop a microfluidic pumping system using super-hydrophilic diatom thin films. The desire to develop such a system stems from the requirement to create a low-cost, self-powered microfluidic pumping system that can sustain a continuous flow over an extended period of time. The diatom biosilica acts not only as the driving force behind the flow, but also serves as ultra-sensitive SERS substrates that allows for trace detection of various molecules. Liquid is drawn from a reservoir to the tip of a 150μm inner diameter capillary tube positioned directly over the diatom film. A thin and long horizontal reservoir is used to prevent flooding on the diatom film when the liquid is initially drawn to the diatom film through a capillary tube from the reservoir. The connection of the meniscus from the capillary to the film was maintained from a horizontal reservoir for a recorded time of 20 hours and 32 minutes before the partially filled reservoir emptied. Flow rates of 0.38, 0.22 and 0.16μL/min were achieved for square biosilica thin films of 49mm2, 25mm2, and 9mm2 at a temperature of 63°F and 45% relative humidity respectively. A temperature-controlled system was introduced for the 49mm2 substrate and flow rates of 0.60, 0.82, 0.93, and 1.15μL/min were observed at 72, 77, 86, and 95°F at 21% relative humidity respectively. More testing and analysis will be performed to test the operation limits of the proposed self-powered microfluidic system.

High-quality textured SnSe thin films for self-powered, rapid-response photothermoelectric application

Nano Energy ◽  
2020 ◽  
Vol 72 ◽  
pp. 104742 ◽  
Author(s):  
Yujia Zhong ◽  
Li Zhang ◽  
Vincent Linseis ◽  
Bingchao Qin ◽  
Wenduo Chen ◽  
...  
Keyword(s):  
Thin Films ◽  
Rapid Response ◽  
High Quality ◽  
Self Powered

scholarly journals Memory Devices: Solution‐Processed Stretchable Ag 2 S Semiconductor Thin Films for Wearable Self‐Powered Nonvolatile Memory (Adv. Mater. 23/2021)

2021 ◽  
Vol 33 (23) ◽  
pp. 2170181
Author(s):  
Seungki Jo ◽  
Soyoung Cho ◽  
U Jeong Yang ◽  
Gyeong‐Seok Hwang ◽  
Seongheon Baek ◽  
...  
Keyword(s):  
Thin Films ◽  
Nonvolatile Memory ◽  
Memory Devices ◽  
Solution Processed ◽  
Semiconductor Thin Films ◽  
Self Powered

Solution‐Processed Stretchable Ag 2 S Semiconductor Thin Films for Wearable Self‐Powered Nonvolatile Memory

2021 ◽  
pp. 2100066
Author(s):  
Seungki Jo ◽  
Soyoung Cho ◽  
U Jeong Yang ◽  
Gyeong‐Seok Hwang ◽  
Seongheon Baek ◽  
...  
Keyword(s):  
Thin Films ◽  
Nonvolatile Memory ◽  
Solution Processed ◽  
Semiconductor Thin Films ◽  
Self Powered

Growth and piezoelectric properties of amorphous and crystalline (K1−xNax)NbO3−based thin films

2021 ◽  
Author(s):  
Jong-Un Woo ◽  
Sun-Woo Kim ◽  
Dae-Su Kim ◽  
In-Su Kim ◽  
Ho-Sung Shin ◽  
...  
Keyword(s):  
Thin Films ◽  
Piezoelectric Properties

Concisely modularized assembling of graphene-based thin films with promising electrode performance

2019 ◽  
Vol 3 (7) ◽  
pp. 1462-1470 ◽  
Author(s):  
Weiwei Wei ◽  
Rohit L. Vekariy ◽  
Chuanting You ◽  
Yafei He ◽  
Ping Liu ◽  
...  
Keyword(s):  
Thin Films ◽  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Double Layer ◽  
Van Der Waals ◽  
Cellulose Nanofibers ◽  
Van Der Waals Interactions ◽  
Electrode Performance ◽  
Reduced Graphene

Highly dense thin films assembled from cellulose nanofibers and reduced graphene oxide via van der Waals interactions to realize ultrahigh volumetric double-layer capacitances.

scholarly journals Direct measurement of the thermoelectric properties of electrochemically deposited Bi2Te3 thin films

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Jose Recatala-Gomez ◽  
Pawan Kumar ◽  
Ady Suwardi ◽  
Anas Abutaha ◽  
Iris Nandhakumar ◽  
...  
Keyword(s):  
Thin Films ◽  
Thermoelectric Properties ◽  
Bismuth Telluride ◽  
Indium Tin Oxide ◽  
Seed Layer ◽  
Room Temperature ◽  
Low Cost ◽  
Temperature Dependent ◽  
Temperature Heat ◽  
Electrochemically Deposited

Abstract The best known thermoelectric material for near room temperature heat-to-electricity conversion is bismuth telluride. Amongst the possible fabrication techniques, electrodeposition has attracted attention due to its simplicity and low cost. However, the measurement of the thermoelectric properties of electrodeposited films is challenging because of the conducting seed layer underneath the film. Here, we develop a method to directly measure the thermoelectric properties of electrodeposited bismuth telluride thin films, grown on indium tin oxide. Using this technique, the temperature dependent thermoelectric properties (Seebeck coefficient and electrical conductivity) of electrodeposited thin films have been measured down to 100 K. A parallel resistor model is employed to discern the signal of the film from the signal of the seed layer and the data are carefully analysed and contextualized with literature. Our analysis demonstrates that the thermoelectric properties of electrodeposited films can be accurately evaluated without inflicting any damage to the films.

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