Article
Optics
Noha H. Harb, Falah A. -H. Mutlak
Summary: The research investigates the impact of Gamma-rays on the morphology and size of porous silicon, utilizing various characterization techniques to observe significant changes in pore structure and size with irradiation. The study suggests that Gamma irradiation may enhance the visibility and size of pores in porous silicon.
Article
Materials Science, Multidisciplinary
Fedor Ptashchenko
Summary: This study investigates the reactions that can occur on hydrogenated silicon surfaces in aqueous solutions of HF under the influence of both negative and positive ionic complexes using quantum-chemical calculations. It was revealed that the H -> F substitution reaction has a high energy barrier, making classical electrochemical dissolution of silicon unlikely. Additionally, it was found that barrier-free reactions of direct fluorination can occur on certain silicon faces, shedding light on the mechanism of silicon etching and the factors affecting the rate of electrochemical etching of silicon.
COMPUTATIONAL MATERIALS SCIENCE
(2021)
Article
Chemistry, Multidisciplinary
Jesse Fletcher, Giacinta Parish, John Dell, Adrian Keating
Summary: Direct laser writing (DLW) is used to selectively create nitridized and carbonized features on a single mesoporous porous silicon (PS) film. Nitridized or carbonized features are formed in an ambient of nitrogen and propane gas, respectively, using a 405 nm laser. The range of laser fluence required to create different feature sizes without damaging the PS film is identified. This work demonstrates the potential applications of engineered PS films, such as selectively engineering thermal conductivity and electrical resistivity using carbonized PS, and micromachining and selective modification of refractive index using nitridized PS.
Article
Electrochemistry
Jia-Chuan Lin, Yi-Cheng Liu, Shan-Heng Lu, Hsu-Nan Yen, Kalpana Settu
Summary: A high specific capacitance porous silicon-based capacitive structure was fabricated using three-dimensional electrochemical etching. Nano-scale graphene was embedded into the surface pores of the porous silicon to improve contact. The increase in specific capacitance due to laser trenches was positively correlated with the extent of lateral etching.
ELECTROCHEMISTRY COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Ayah A. Hafez, Magdy M. Mohammed, I. H. Ibrahim, G. M. Youssef
Summary: A porous silicon non-enzymatic sensor (Ag/Ps/Si/Ag) was prepared using galvanostatic electrochemical etching, with optical measurements and morphological analysis revealing its suitability for detecting glucose concentrations.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2021)
Article
Chemistry, Multidisciplinary
Yingying Jiang, Lu Wang, Michel Meunier, Utkur Mirsaidov
Summary: Porous alloy nanomaterials are important for various applications, and the evolution of individual AuAg alloy NPs during chemical and electrochemical etching processes is tracked using in situ liquid phase transmission electron microscopy. The electrochemical etching method produces NPs with more uniform pore sizes and allows for tuning the NPs porosity by modulating the electrochemical potential. The formation of an Au-rich passivation layer on the surface of NPs at initial stages of etching is critical in preserving the NP's porous shell as pores form underneath this layer during the etching process.
Article
Chemistry, Multidisciplinary
Stella Gries, Manuel Brinker, Berit Zeller-Plumhoff, Dagmar Rings, Tobias Krekeler, Elena Longo, Imke Greving, Patrick Huber
Summary: Many biological materials have both small nanoscale pores and large macroscopic capillaries, allowing for optimized mass transport and lightweight structures. This study presents a novel approach to create hierarchical porosity in artificial materials using metal-assisted chemical etching (MACE) and photolithography, resulting in single-crystalline silicon with bimodal pore size distribution. The process involves a metal-catalyzed reduction-oxidation reaction and silver nanoparticles acting as catalysts. The resulting hierarchically porous silicon membranes have potential applications in energy storage, sensorics, and opto-fluidic applications.
Article
Chemistry, Applied
M. Alejandra Mazo, Maria T. Colomer, Aitana Tamayo, Juan Rubio
Summary: Novel hierarchical micro-meso-macroporous fluorine-doped silicon oxycarbide derived materials were obtained through HF etching and pyrolysis, showing good electrochemical performance and potential applications as electrodes for supercapacitors in the field of energy storage.
MICROPOROUS AND MESOPOROUS MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Ana Carolina Fernandes da Silva, Luiz Angelo Berni
Summary: Porous silicon, discovered in the mid-1950s, has various applications and is being studied as black silicon to reduce silicon surface reflectance. The study produced samples with varying refractive indexes and found that samples with six layers of refractive index ranging from 1.4 to 2.4 achieved the best results with a reflectance of 5%. The influence of porous layer thickness on reflectance profile was also observed.
Article
Chemistry, Analytical
Yu Tang, Yunke Bi, Hao Wei, Zhongyu Hou, Zi Wang
Summary: A general method for improving the dynamic range of electrochemical sensing devices based on 3D porous electrodes through morphological optimization has been introduced. By increasing the array height of 3D-pSi, the electrochemical active surface area (EASA) was raised and linear range of detection of H2O2 was expanded, making it crucial for the fast detection of high concentrations of H2O2 in scenarios such as fuel cells and catalytic oxygen reduction reaction systems.
SENSORS AND ACTUATORS B-CHEMICAL
(2022)
Article
Multidisciplinary Sciences
Aliaksandr Sharstniou, Stanislau Niauzorau, Ashlesha Junghare, Bruno P. Azeredo
Summary: Metal-assisted electrochemical imprinting (Mac-Imprint) is a novel manufacturing method that enables direct patterning of micro- and nanoscale features in monocrystalline semiconductors without the need for templates and lithographical steps. It offers high throughput and low defect density.
JOVE-JOURNAL OF VISUALIZED EXPERIMENTS
(2022)
Article
Chemistry, Multidisciplinary
Ling-Yi Liang, Yu-Han Kung, Vincent K. S. Hsiao, Chih-Chien Chu
Summary: In this study, porous silicon (PSi) fabricated using metal-assisted chemical etching (MACE) was investigated as a substrate for the deposition of Au nanoparticles (NPs) for the reduction of nitroaromatic compounds. The high surface area of PSi allowed for efficient deposition of Au NPs, and the MACE method provided a well-defined porous structure in a single step. The catalytic activity of Au NPs on PSi was evaluated using the reduction of p-nitroaniline as a model reaction, and the results indicated that the catalytic activity was influenced by the etching time. Overall, the study highlighted the potential of PSi fabricated using MACE as a substrate for the deposition of metal NPs for catalytic applications.
Article
Materials Science, Ceramics
Chen Lichi, Wang Yaogong, Wang Wenjiang, Ma Xiaoqin, Yang Jingyuan, Zhang Xiaoning
Summary: A high-efficiency preparation method for silicon nanowires and porous silicon composite structure was proposed by introducing electrocatalytic metal assisted chemical etching, achieving a significant increase in preparation rate compared to traditional methods. The effects of AgNO3 concentration, etching time, and etching current on the morphology of the composite structure were investigated, and the field emission characteristics of the structure were tested, showing promising results in current density and threshold electric field.
JOURNAL OF INORGANIC MATERIALS
(2021)
Article
Engineering, Electrical & Electronic
Kirill A. Gonchar, Daniil Moiseev, Ivan Bozhev, Liubov A. Osminkina
Summary: Porous silicon nanowires (PSi NWs) were fabricated using a two step metal-assisted chemical etching method, and it was found that their structural and optical properties depend on the concentration of hydrogen peroxide. The thickness ratio of layers and size of nanocrystals can be tuned by choosing the required concentration of H2O2.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2021)
Article
Chemistry, Multidisciplinary
Julian A. Michaels, Lukas Janavicius, Xihang Wu, Clarence Chan, Hsieh-Chih Huang, Shunya Namiki, Munho Kim, Dane Sievers, Xiuling Li
Summary: This paper presents a plasma-free, open-circuit, photo-induced metal-assisted chemical etch method for fabricating micro and nanoscale features on Silicon carbide without causing high energy ion-related surface damage. The comprehensive exploration of parameter space demonstrates the controllability and versatility of this technique in producing ordered arrays of micro and nanoscale SiC structures with porous or solid sidewalls, while elucidating the etching mechanism.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Physics, Atomic, Molecular & Chemical
Daniel D. Vallejo, Joseph L. Corstvet, Facundo M. Fernandez
Summary: Electrospray ionization (ESI) is a popular method for generating ions in mass spectrometry (MS). The use of triboelectric nanogenerators as power sources for ESI shows promise in improving the analytical capabilities. This review highlights the fundamentals of ESI driven by DC power supplies, the contrasting qualities to triboelectric nanogenerator power supplies, and its applications in forensics, metabolomics, and protein structure analysis.
INTERNATIONAL JOURNAL OF MASS SPECTROMETRY
(2024)
Article
Physics, Atomic, Molecular & Chemical
Florian Kluibenschedl, Anna Ploner, Christina Meisenbichler, Robert Konrat, Thomas Mueller
Summary: Mass spectrometry imaging (MSI) is a powerful analytical technique for localizing chemicals on surfaces. A new interactive approach, called interactive mass spectrometry imaging (IMSI), has been developed using a pen-like ionization interface connected to a mass spectrometer. This approach allows for real-time tracking of the pen's motion on a surface to obtain chemical data. The IMSI method was successfully tested on inkjet-printed letters and mouse brain tissue samples.
INTERNATIONAL JOURNAL OF MASS SPECTROMETRY
(2024)
Article
Physics, Atomic, Molecular & Chemical
Shubhangee S. Gaikwad, Saurabh D. Kalkate, Amruta A. Bankar, Amol S. Bansode
Summary: A stable high-performance thin layer chromatographic technique was developed and validated for estimating the content of Paracetamol and Prochlorperazine. The method was validated according to the International Conference on Harmonization requirements. The study also investigated the degradation products of the drugs.
INTERNATIONAL JOURNAL OF MASS SPECTROMETRY
(2024)
Article
Physics, Atomic, Molecular & Chemical
Ioan Marginean
Summary: In this study, a coherent classification of electrospray axial regimes is provided based on non-linear fluid dynamics. This classification includes periodic, transient/chaotic, and stationary regimes, and emphasizes the importance of spray current measurements and electrospray characteristic curves in diagnosing the operation and transitions between these regimes. The effect of the electrospray operating regime on the mass spectrometer signal is also summarized.
INTERNATIONAL JOURNAL OF MASS SPECTROMETRY
(2024)
Article
Physics, Atomic, Molecular & Chemical
Le Thao Anh Nguyen, Chris J. Bowen, Laura Burchill, Spencer J. Williams, Richard A. J. O'Hair
Summary: D-Cysteinolic acid (D-CA) is an important metabolite in the biosulfur cycle, while a structural isomer, (R)-3-amino-2-hydroxypropanesulfonate ((R)-AHPS), is less common. Through mass spectrometry and density-functional theory, this study reveals the fragmentation reactions of these two isomers and methods to distinguish them.
INTERNATIONAL JOURNAL OF MASS SPECTROMETRY
(2024)
Article
Physics, Atomic, Molecular & Chemical
Frank J. Wensink, Deepak Pradeep, P. B. Armentrout, Joost M. Bakker
Summary: Methane and cyclopropane were reacted with Ru+ ions, and the resulting products were identified and characterized using mass spectrometry, IR action spectroscopy, and density functional theory calculations.
INTERNATIONAL JOURNAL OF MASS SPECTROMETRY
(2024)
