Suppressing the Coffee-Ring Effect in Semitransparent MnO2 Film for a High-Performance Solar-Powered Energy Storage Window

2016 ◽  
Vol 8 (14) ◽  
pp. 9088-9096 ◽  
Author(s):  
Huanyu Jin ◽  
Jiasheng Qian ◽  
Limin Zhou ◽  
Jikang Yuan ◽  
Haitao Huang ◽  
...  
Keyword(s):  
Energy Storage ◽  
High Performance ◽  
Coffee Ring ◽  
Coffee Ring Effect ◽  
Solar Powered ◽  
Ring Effect

scholarly journals Fully Printed High-Performance n-Type Metal Oxide Thin-Film Transistors Utilizing Coffee-Ring Effect

2021 ◽  
Vol 13 (1) ◽  
Author(s):  
Kun Liang ◽  
Dingwei Li ◽  
Huihui Ren ◽  
Momo Zhao ◽  
Hong Wang ◽  
...  
Keyword(s):  
Metal Oxide ◽  
Indium Tin Oxide ◽  
High Performance ◽  
Supply Voltage ◽  
Oxide Semiconductor ◽  
Oxide Thin Film ◽  
Electrical Stability ◽  
Coffee Ring ◽  
Coffee Ring Effect ◽  
Ring Effect

AbstractMetal oxide thin-films transistors (TFTs) produced from solution-based printing techniques can lead to large-area electronics with low cost. However, the performance of current printed devices is inferior to those from vacuum-based methods due to poor film uniformity induced by the “coffee-ring” effect. Here, we report a novel approach to print high-performance indium tin oxide (ITO)-based TFTs and logic inverters by taking advantage of such notorious effect. ITO has high electrical conductivity and is generally used as an electrode material. However, by reducing the film thickness down to nanometers scale, the carrier concentration of ITO can be effectively reduced to enable new applications as active channels in transistors. The ultrathin (~10-nm-thick) ITO film in the center of the coffee-ring worked as semiconducting channels, while the thick ITO ridges (>18-nm-thick) served as the contact electrodes. The fully inkjet-printed ITO TFTs exhibited a high saturation mobility of 34.9 cm2 V−1 s−1 and a low subthreshold swing of 105 mV dec−1. In addition, the devices exhibited excellent electrical stability under positive bias illumination stress (PBIS, ΔVth = 0.31 V) and negative bias illuminaiton stress (NBIS, ΔVth = −0.29 V) after 10,000 s voltage bias tests. More remarkably, fully printed n-type metal–oxide–semiconductor (NMOS) inverter based on ITO TFTs exhibited an extremely high gain of 181 at a low-supply voltage of 3 V, promising for advanced electronics applications.

scholarly journals Understanding the Coffee ring Effect on Self‐discharge Behavior of Printed micro‐Supercapacitors

2021 ◽  
Author(s):  
Jingzhi Hu ◽  
Zhaohua Xu ◽  
Kai Yuan ◽  
Chao Shen ◽  
Keyu Xie ◽  
...  
Keyword(s):  
Coffee Ring ◽  
Discharge Behavior ◽  
Coffee Ring Effect ◽  
Ring Effect

Influence of membrane character on suppression of coffee-ring effect

2021 ◽  
Author(s):  
S.S. Shahruddin ◽  
N. Ideris ◽  
N.F. Abu Bakar ◽  
A.L. Ahmad ◽  
N.F.C. Lah
Keyword(s):  
Coffee Ring ◽  
Coffee Ring Effect ◽  
Ring Effect

Stability improvement for dried droplet pretreatment by suppression of coffee ring effect using electrochemical anodized nanoporous tin dioxide substrate

2020 ◽  
Vol 187 (12) ◽  
Author(s):  
Yuanchao Liu ◽  
Jie Pan ◽  
Zhenlin Hu ◽  
Yanwu Chu ◽  
Muhammad Shehzad Khan ◽  
...  
Keyword(s):  
Tin Dioxide ◽  
Coffee Ring ◽  
Coffee Ring Effect ◽  
Ring Effect

Beyond the coffee-ring effect: Pattern formation by wetting and spreading of drops

2018 ◽  
Vol 98 (4) ◽  
Author(s):  
Dileep Mampallil ◽  
Meenakshi Sharma ◽  
Ashwini Sen ◽  
Shubham Sinha
Keyword(s):  
Pattern Formation ◽  
Coffee Ring ◽  
Coffee Ring Effect ◽  
Ring Effect

scholarly journals Position Dependence of Emission Wavelength of a SiO2 Colloidal Photonic-Crystal Laser

Polymers ◽  
2020 ◽  
Vol 12 (4) ◽  
pp. 802 ◽  
Author(s):  
Ting-Hui Chen ◽  
Bing-Yau Huang ◽  
Chie-Tong Kuo
Keyword(s):  
Photonic Crystal ◽  
Colloidal Crystal ◽  
Threshold Energy ◽  
Silica Particles ◽  
Wavelength Tunable ◽  
Coffee Ring ◽  
Crystal Laser ◽  
Coffee Ring Effect ◽  
Photonic Crystal Laser ◽  
Ring Effect

In this paper, a wavelength tunable colloidal-crystal laser with monodispersed silica particles was demonstrated. Silica particles were synthesized through the modified Stöber process and self-assembled into the colloidal photonic-crystal structure, which was then used to form the optic cavity of a wavelength tunable laser device. Due to Bragg’s diffraction of the colloidal photonic-crystal and the coffee ring effect, the forbidden energy gap of light varied with different lattice sizes at different positions of the colloidal photonic-crystal. When the pumping pulsed laser irradiated on the gain medium of the sample, the fluorescence was restricted and enhanced by the colloidal photonic-crystal. Lasing emission with a single peak occurred when the energy of the pumping laser exceeded the threshold energy. The threshold energy and the full-width at half-maximum (FWHM) of the proposed laser were 7.63 µJ/pulse and 2.88 nm, respectively. Moreover, the lasing wavelength of the colloidal photonic-crystal laser could be tuned from 604 nm to 594 nm, corresponding to the various positions in the sample due to the coffee ring effect.

scholarly journals Evaporation-Induced Crystal Nucleation and Morphology of Dried Poly(Vinylidene Fluoride) Droplets

Crystals ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1442
Author(s):  
Yongri Liang ◽  
Susu Wang
Keyword(s):  
Droplet Size ◽  
Evaporation Rate ◽  
Vinylidene Fluoride ◽  
Grazing Incidence ◽  
Solvent Evaporation ◽  
Crystal Nucleation ◽  
Coffee Ring ◽  
Poly Vinylidene Fluoride ◽  
Coffee Ring Effect ◽  
Ring Effect

The evaporation of a polymer solution droplet is important in solution-based polymer film fabrications, such as inkjet printing, spray coatings, and droplet casting, etc. In this work, we investigated the effect of droplet size, solvent evaporation rate, and concentration on the “coffee-ring” effect, crystal nucleation, polymorphism, and morphology of dried poly (vinylidene fluoride) (PVDF) solution droplets with the atomic force microscopy (AFM) and two-dimensional grazing incidence wide angle X-ray scattering (2D GIWAXS) method. We found that the crystal structure, morphology and crystal distribution in the center and edge regions of dried PVDF droplets were different due to the “coffee-ring” effect. The “coffee-ring” effect of dried PVDF droplets was mainly composited of accumulated crystals at the edge region of a droplet, which was mainly made by the crystallization of migrated chains. The interplay between the migration of chains and the crystallization and solidification of PVDF droplets significantly influenced the formation of the “coffee-ring”. In addition, our results showed that the decrease in droplet size and the controlling solvent evaporation rate were effective ways to improve the electroactive crystalline phases (β and γ-phases) nucleation and decrease the crystal size.

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