Article
Nanoscience & Nanotechnology
Koki Nozawa, Hiromasa Murata, Takashi Suemasu, Kaoru Toko
Summary: In this study, nanostructured Si layers were synthesized at low temperatures by combining metal-catalyzed crystal growth and etching. The lower crystallinity and finer nanostructures improved the anode characteristics of Li-ion batteries.
ACS APPLIED NANO MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Christopher Schutzeichel, Nataliya Kiriy, Anton Kiriy, Brigitte Voit
Summary: This paper presents a novel microstructuring method that allows patterning of n-doped silicon substrates without the need for etch-masks or stencils. The method involves simple alkaline etching under illumination, controlled by p-doped micro-sized implants buried beneath the n-doped layer. The buried implants act as micro-sized photovoltaic cells, generating a flux of electrons to protect the silicon oxide layer from etching, ultimately leading to substrate microstructuring.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Chemistry, Analytical
Chutiparn Lertvachirapaiboon, Naraphorn Tunghathaithip, Sukkaneste Tungasmita, Akira Baba, Kazunari Shinbo, Keizo Kato
Summary: This study presents a practical technique for determining the length of a silicon nanowire (SiNW) array using reflected images from a smartphone camera. The relationship between reflection spectrum and SiNW array length was investigated, showing an exponential increase in percent reflectance with increasing average length. Optical sensing was developed into a simple and practical method for detecting SiNW array lengths, demonstrating the potential for on-site characterization of reflective materials.
INSTRUMENTATION SCIENCE & TECHNOLOGY
(2021)
Article
Chemistry, Physical
Erik Cheng, Gyeong S. Hwang
Summary: The study demonstrates that the dissociative chemisorption of CH3F, along with surface activation induced by Ar+ ion bombardment, are key factors in achieving Atomic Layer Etching (ALE) of Si3N4, contrary to the common understanding of surface chemical modification via direct reaction with CH3F.
APPLIED SURFACE SCIENCE
(2021)
Article
Nanoscience & Nanotechnology
Santanu Roy, Vera Bocharova, Andrew G. Stack, Vyacheslav S. Bryantsev
Summary: This study investigates the nucleation process of sodium sulfate in aqueous solution using coordination number as a reaction coordinate and rate theory, revealing that rate processes exhibit high sensitivity to evolving structures, providing a means to predict nucleation-related structures and dynamics.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Nanoscience & Nanotechnology
Lei Wu, Licong Cui, Wang He, Jian Guo, Bingjun Yu, Linmao Qian
Summary: This study systematically investigates the roles of mechanically driven defects in wet etching and reveals the antietching role of mechanically driven amorphous Si (a-Si) and the promoting etching role of distorted Si. Selective etching mechanisms for each defect are addressed based on the proposed dissolution model.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Physical
Savita Rani, Rangeeta Dhaka, A. K. Shukla
Summary: Metallic nanoparticles deposited on semiconductor nanowires, known as heterostructures, enhance optical and optoelectrical characteristics through the interaction between surface plasmons and nanowires. Silicon nanowires (SiNWs) were synthesized using metal-assisted chemical etching and then silver nanoparticles (AgNPs) were deposited on the SiNWs using electroless deposition. The flexibility of the nanowire structures allows for the incorporation of multiple metallic nanoparticles, making them useful for various applications in nanotechnology. The deposition of AgNPs on SiNWs results in improved light absorption, increased surface area, and enhanced charge carrier mobility, making this substrate important for next-generation photovoltaic cells.
Article
Chemistry, Physical
Soyong Park, Hyunwook Jung, Kyung-Ah Min, Junyeop Kim, Byungchan Han
Summary: This study elucidates the excellent etching selectivity of phosphoric acid towards silicon nitride over silicon dioxide surfaces at high concentration and temperature, pointing out that pyrophosphoric acid is more reactive than orthophosphoric acid. Water molecules are found to assist the etching process through catalysis and hydrolysis mechanisms.
APPLIED SURFACE SCIENCE
(2021)
Article
Materials Science, Multidisciplinary
Shahnawaz Uddin, Md Roslan Hashim, Mohd Zamir Pakhuruddin
Summary: This study investigated the fabrication of b-Si absorber using the AACE process for the first time, and found that b-Si fabricated with a 12 nm thick aluminum film exhibited the lowest Ravg and highest broadband light absorption. The findings demonstrate the potential of the AACE process for producing b-Si with superior broadband light absorption, which is important for photovoltaic applications.
MATERIALS CHEMISTRY AND PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Alfredo Morales-Sanchez, Maria Antonia Cardona-Castro, Liliana Licea-Jimenez, Liliana Palacios-Huerta, Antonio Coyopol, Sergio Alfonso Perez-Garcia, Jaime Alvarez-Quintana, Mario Moreno
Summary: In this work, a correlation between the composition and the microstructural and optical properties of luminescent porous silicon (PSi) films is shown. The use of nitric acid enhances the photoluminescence intensity of PSi samples. Changing the concentration ratio of the electrolyte solution can modify the size of silicon nanocrystals and the emission wavelength. These findings are important for understanding the properties and applications of PSi.
Article
Nanoscience & Nanotechnology
Wataru Kubota, Ryoya Yamaoka, Toru Utsunomiya, Takashi Ichii, Hiroyuki Sugimura
Summary: The vapor-phase etching assisted by graphene oxide enhances the etching reaction without the formation of a porous layer, and microcontact printing of graphene oxide can be combined with silicon etching to form micrometer-sized pores in desired areas.
ACS APPLIED NANO MATERIALS
(2022)
Article
Mechanics
C. K. Krishnadasan, N. Siva Shanmugam, B. Sivasubramonian, B. Nageswara Rao, R. Suresh
Summary: Composite laminated structural members are mechanically joined to neighbouring parts for reliability. Design and finite element analysis are essential in assessing joint design and predicting damage propagation.
COMPOSITE STRUCTURES
(2021)
Article
Chemistry, Physical
Shih-Nan Hsiao, Kenji Ishikawa, Toshio Hayashi, Jiwei Ni, Takayoshi Tsutsumi, Makoto Sekine, Masaru Hori
Summary: Gas chemistry plays a significant role in etch selectivity in semiconductor device fabrication, enabling control over the etchant composition for atomic-scale removal and high-aspect ratio features. By experimenting and conducting quantum chemical calculations, the effects of CH2FCHF2 and O-2 mixtures on etch selectivity among SiN, SiO2, and poly-Si films were investigated, focusing on the composition of CHF2+ and CH2F+ ions and their reactions.
APPLIED SURFACE SCIENCE
(2021)
Article
Engineering, Electrical & Electronic
Jinzhu Zhou, Weijian Zhou, Yue Zhang, Yipeng Wang, Tieying Ma
Summary: Si-based double-layer overlapping open microchannels have been designed and fabricated for microfluidic applications. The top channel has been ingeniously designed in both T-shaped and X-shaped configurations along the <100> direction, while the bottom channel has been prepared along the <110> direction, allowing it to be semi-buried into the top channel at a 45-degree angle. An undercut characteristic of 25% TMAH has been utilized to create a unique overlapping microchannel structure by removing material from the overlapping part of the two layers of channels. This results in intersecting microchannels that are not connected, providing significant structural advantages over traditional single-layer microchannels. With this innovative design, two different substances can be delivered independently and efficiently in the same area.
SENSORS AND ACTUATORS A-PHYSICAL
(2023)
Article
Multidisciplinary Sciences
Susannah Bourne-Worster, Oliver Feighan, Frederick R. Manby
Summary: Highly concentrated chlorophyll solutions exhibit rapid fluorescence quenching, which is not observed in photosynthetic light-harvesting antenna complexes. The proposed mechanism for this quenching involves energy transfer from excited chlorophyll monomers to closely associated chlorophyll pairs, followed by rapid nonradiative decay to the ground state. Rate constants for charge separation are calculated using molecular dynamics simulations, showing that this pathway competes with fluorescence at experimentally measured quenching concentrations. The LH2 protein in the light-harvesting complex II prevents quenching by restricting the range of orientations neighboring chlorophyll pairs can adopt.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2023)
Article
Engineering, Electrical & Electronic
Kurt W. Kolasinski
SEMICONDUCTOR SCIENCE AND TECHNOLOGY
(2016)
Article
Chemistry, Multidisciplinary
Chiara Cozzi, Giovanni Polito, Kurt W. Kolasinski, Giuseppe Barillaro
ADVANCED FUNCTIONAL MATERIALS
(2017)
Article
Chemistry, Multidisciplinary
Kurt W. Kolasinski, Nathan J. Gimbar, Haibo Yu, Mark Aindow, Ermei Makila, Jarno Salonen
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2017)
Review
Materials Science, Multidisciplinary
Kurt W. Kolasinski
CURRENT OPINION IN SOLID STATE & MATERIALS SCIENCE
(2016)
Article
Chemistry, Multidisciplinary
Kurt W. Kolasinski, Bret A. Unger, Alexis L. Ernst, Mark Aindow
FRONTIERS IN CHEMISTRY
(2019)
Article
Chemistry, Multidisciplinary
Ermei Makila, Anne-Mari Anton Willmore, Haibo Yu, Marianna Irri, Mark Aindow, Tambet Teesalu, Leigh T. Canham, Kurt W. Kolasinski, Jarno Salonen
Article
Nanoscience & Nanotechnology
Konstantin Tamarov, Joseph D. Swanson, Bret A. Unger, Kurt W. Kolasinski, Alexis T. Ernst, Mark Aindow, Vesa-Pekka Lehto, Joakim Riikonen
ACS APPLIED MATERIALS & INTERFACES
(2020)
Article
Nanoscience & Nanotechnology
Konstantin Tamarov, Riku Kiviluoto, Joseph D. Swanson, Bret A. Unger, Alexis T. Ernst, Mark Aindow, Joakim Riikonen, Vesa-Pekka Lehto, Kurt W. Kolasinski
ACS APPLIED MATERIALS & INTERFACES
(2020)
Review
Chemistry, Analytical
Kurt W. Kolasinski
Summary: The electroless etching of semiconductors has become an advanced microfabrication process with the addition of structured metal catalysts. This technique allows for the precise patterning of wafer substrates and the production of nanoparticles, leading to the creation of porous structures and nanostructured powders. Metal-assisted catalytic etching can be controlled to produce various pore structures in substrates and nanowires with different core compositions.
Article
Chemistry, Physical
Dipendu Saha, Pasquale Gismondi, Kurt W. Kolasinski, Samantha L. Shumlas, Sylvie Rangan, Babak Eslami, Amy McConnell, TaeVaughn Bui, Kayla Cunfer
Summary: In this study, a composite nanofiber mat consisting of g-C3N4, gold nanoparticles (AuNPs) and polyvinylidene fluoride (PVDF) was fabricated by electrospinning. The structure and chemical properties of the mat were thoroughly investigated, revealing potential photocatalytic efficiency for applications such as dye degradation. The results showed promising performance in photocatalytic degradation of methylene blue and potential for repeated cycles.
SURFACES AND INTERFACES
(2021)
Article
Biochemistry & Molecular Biology
Marisa L. Comroe, Kurt W. Kolasinski, Dipendu Saha
Summary: This article introduces the use of 3D printing technology to manufacture porous carbon materials. By using a special ink and a modified 3D printer, a stable structure and good adsorption performance were achieved for the 3D printed porous carbon material. The selectivity and adsorption capacity of the material were experimentally verified, demonstrating potential applications.
Article
Chemistry, Physical
Jacklyn A. DiPietro, Kurt W. Kolasinski
Summary: Mechanochemistry was used to initiate the reaction between hydrogen-terminated porous silicon powder and arginine. The results showed that arginine was physisorbed onto the silicon surface, leading to a change in photoluminescence intensity. Grinding the powder resulted in particles in the 100 nm range, but quenched the photoluminescence. Rinsing with water was necessary to remove excess arginine and prevent particle aggregation. The arginine modification resulted in a positively charged silicon surface.
Article
Chemistry, Physical
Kurt W. Kolasinski, Joseph D. Swanson, Benjamin Roe, Teresa Lee
Meeting Abstract
Chemistry, Multidisciplinary
Kurt Kolasinski, Bret Unger, Joseph Swanson, Haibo Yu, Alexis Ernst, Mark Aindow, Ermei Makila, Jarno Salonen, Konstantin Tamarov, Joakim Riikonen, Vesa-Pekka Lehto
ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY
(2019)
Proceedings Paper
Electrochemistry
C. Cozzi, G. Polito, K. W. Kolasinski, G. Barillaro
SILICON COMPATIBLE MATERIALS, PROCESSES, AND TECHNOLOGIES FOR ADVANCED INTEGRATED CIRCUITS AND EMERGING APPLICATIONS 7
(2017)