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
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
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
Chemistry, Physical
Qin Tang, Xianyong Chen, Dali Zhou, Can Liu
Summary: By utilizing wasted villi of bamboo shoot shell and KOH as green carbon source and chemical etching agent, the HPC/SiC composite material exhibited excellent specific capacitance and cycling performance. Additionally, this study demonstrated the formation of SiC in wasted VBSS under mild natural conditions, opening up new opportunities for the rational design of more efficient biomass-based supercapacitor materials.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2021)
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, Physical
Yuming Xie, Jingqiu Li, Mengjue Cao, Yi Feng, Jianfeng Yao
Summary: By synthesizing CoS2/Co-Ni LDHs with rich hierarchical pores and uniformly distributed CoS2 nanoparticles, efficient mass diffusion and exposure of active sites are achieved, resulting in excellent specific capacitance and capacitance retention.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
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
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
Pharmacology & Pharmacy
Conor O'Mahony, Ryan Sebastian, Fjodors Tjulkins, Derek Whelan, Andrea Bocchino, Yuan Hu, Joe O'Brien, Jim Scully, Margaret Hegarty, Alan Blake, Ines Slimi, A. James P. Clover, Alexander Lyness, Anne-Marie Kelleher
Summary: This paper describes a method for fabricating arrays of hollow silicon microneedles using only two bulk silicon etches. The microneedle arrays show biomechanical reliability and have the potential to be used for transdermal delivery and diagnostics.
INTERNATIONAL JOURNAL OF PHARMACEUTICS
(2023)
Article
Electrochemistry
Gihwan Joe, Heon-Cheol Shin
Summary: In this study, niobium with a hierarchical porous structure was successfully produced through a one-pot electrochemical etching process without the use of hydrofluoric acid. The combination of limited repetition of pulse etching and high concentration of aggressive SO42- anions resulted in hierarchical pores with high order over 3. By comparing the theoretical and experimental surface areas, a deeper understanding was gained about the actual pore shape and hierarchical pore order of the porous structure produced in this work.
JOURNAL OF ELECTROCHEMICAL SCIENCE AND TECHNOLOGY
(2021)
Article
Engineering, Electrical & Electronic
Lei Zhang, Kai Gao, Zhou Zeng, Kai Wang, Chengxiang Zhao, Daohan Ge, Liqiang Zhang
Summary: This experiment studied the electrochemical etching of P-type monocrystal silicon in a mixed solution of hydrofluoric acid (HF) and dimethylformamide (DMF). By applying this method, high-aspect-ratio and high etching rate porous silicon was successfully obtained. Photolithographic treatment and further electrochemical etching led to the fabrication of high-aspect-ratio regular-array P-type porous silicon. This method is significant for the design of microelectromechanical systems (MEMS) that require high-aspect-ratio silicon structures.
JOURNAL OF ELECTRONIC MATERIALS
(2023)
Article
Electrochemistry
Xi Yang, Fengshuo Xi, Xiuhua Chen, Shaoyuan Li, Xiaohan Wan, Wenhui Ma, Peng Dong, Jianguo Duan, Yuanchih Chang
Summary: The study systematically examined the relationship between preparation conditions, nanostructure, and cracking behavior of PSi surface. It was found that the preparation conditions and nanostructure influenced the cracking behavior, while the extent of cracking was controlled by the porosity of the material.
Review
Materials Science, Multidisciplinary
Hashim Alhmoud, Daniel Brodoceanu, Roey Elnathan, Tobias Kraus, Nicolas H. Voelcker
Summary: Metal-assisted chemical etching (MACE) offers control over size, shape, and porosity of porous silicon nanostructures in a single step, making them suitable as biomaterials. The simplicity and flexibility of MACE are advantages, but the complexity of reaction parameters and lack of a complete model hinder rational design. Current understanding of the MACE reaction mechanism still contains uncertainties.
PROGRESS IN MATERIALS SCIENCE
(2021)
Article
Materials Science, Coatings & Films
Chunnan Wang, Ruomei Shao, Guiqiang Wang, Jingru Zhao, Zhou Sha, Shuqing Sun
Summary: This paper presents the anisotropic wet etching of porous anodic alumina (PAA) using phosphoric acid to controllably form various structures, achieving specific structures such as alumina micropillar arrays by controlling the thickness of PAA films. By fine-tuning the etching conditions, cone-shaped pillar arrays can also be obtained. The super-hydrophobic surfaces prepared can be used as templates to replicate various polymer structures.
SURFACE & COATINGS TECHNOLOGY
(2021)
Review
Nanoscience & Nanotechnology
Kunwoo Lee, Nithya Lingampalli, Albert P. Pisano, Niren Murthy, Hongyun So
ACS APPLIED MATERIALS & INTERFACES
(2015)
Article
Nanoscience & Nanotechnology
Kunwoo Lee, Pengzhi Yu, Nithya Lingampalli, Hyun Jin Kim, Richard Tang, Niren Murthy
INTERNATIONAL JOURNAL OF NANOMEDICINE
(2015)
Article
Chemistry, Physical
Kunwoo Lee, Mohammad Rafi, Xiaojian Wang, Kiana Aran, Xuli Feng, Carlo Lo Sterzo, Richard Tang, Nithya Lingampalli, Hyun Jin Kim, Niren Murthy
Article
Cell Biology
Kiana Aran, Marc Chooljian, Jacobo Paredes, Mohammad Rafi, Kunwoo Lee, Allison Y. Kim, Jeanny An, Jennifer F. Yau, Helen Chum, Irina Conboy, Niren Murthy, Dorian Liepmann
SCIENCE TRANSLATIONAL MEDICINE
(2017)
Article
Biology
Kunwoo Lee, Vanessa A. Mackley, Anirudh Rao, Anthony T. Chong, Mark A. Dewitt, Jacob E. Corn, Niren Murthy
Article
Engineering, Biomedical
Kunwoo Lee, Michael Conboy, Hyo Min Park, Fuguo Jiang, Hyun Jin Kim, Mark A. Dewitt, Vanessa A. Mackley, Kevin Chang, Anirudh Rao, Colin Skinner, Tamanna Shobha, Melod Mehdipour, Hui Liu, Wen-chin Huang, Freeman Lan, Nicolas L. Bray, Song Li, Jacob E. Corn, Kazunori Kataoka, Jennifer A. Doudna, Irina Conboy, Niren Murthy
NATURE BIOMEDICAL ENGINEERING
(2017)
Review
Biochemical Research Methods
Yumiao Zhang, Joachim Justad Roise, Kunwoo Lee, Jie Li, Niren Murthy
CURRENT OPINION IN BIOTECHNOLOGY
(2018)
Article
Nanoscience & Nanotechnology
Hongyun So, Kunwoo Lee, Niren Murthy, Albert P. Pisano
ACS APPLIED MATERIALS & INTERFACES
(2014)
Article
Chemistry, Multidisciplinary
Vuk Uskokovic, Kunwoo Lee, Phin Peng Lee, Kathleen E. Fischer, Tejal A. Desai