Article
Nanoscience & Nanotechnology
Daqian Si, Zhihao Zhang, Zhiqiang Wang, Yinci Chen, Xu Gao, Bo Da, Hongxuan Guo, Litao Sun
Summary: In this study, nanopatterned hydrogels were fabricated using a scanning electron microscope. The distribution of electron scattering to induce hydrogel cross-linking was analyzed through an optimized Monte Carlo simulation with Pearson correlation coefficient analysis. The study found that the feature size of poly(ethylene glycol) diacrylate hydrogel was approximately 280 nm under certain conditions. This research provides a solution for the miniaturized preparation of nanohydrogels, which can enhance the density of arrays in nanosensors.
ACS APPLIED NANO MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Samaneh Esfandiarpour, J. Todd Hastings
Summary: Control over liquid film in partial vacuum is challenging in focused electron beam induced deposition of pure materials from aqueous solutions. By modifying the substrate, a parametric study of copper deposition was conducted, revealing the transition from electron to mass-transport limited deposition and additional regimes characterized by aggregated and high-aspect ratio deposits. The high deposition efficiency of 1-10 copper atoms per primary electron observed is consistent with a radiation chemical model of the deposition process.
Article
Chemistry, Physical
Alexey Prosvetov, Alexey V. Verkhovtsev, Gennady Sushko, Andrey Solov'yov
Summary: This study investigates the growth of iron-containing nanostructures during focused electron beam-induced deposition (FEBID) using atomistic irradiation-driven molecular dynamics (IDMD) simulations. The simulations reveal that the morphology and elemental composition of the deposit vary significantly with increasing electron current. A low current leads to the formation of nanogranular structures with low metal content, while a higher current facilitates the coalescence of metal clusters into dendrite-like structures with higher metal content.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Engineering, Manufacturing
Deepak Kumar, Ravi Shankar Rai, Vivek Bajpai, Nirmal Kumar Singh
Summary: This study presents an accelerated growth technique for the fabrication of 2D assembly of ZnO nanostructures and investigates the impact of concentration variance on their morphology. The results show that ZnO nanostructures grown at different concentrations exhibit distinct morphologies and crystal structures.
MATERIALS AND MANUFACTURING PROCESSES
(2022)
Article
Nanoscience & Nanotechnology
Elif Bilgilisoy, Ali Kamali, Thomas Xaver Gentner, Gerd Ballmann, Sjoerd Harder, Hans-Peter Steinrueck, Hubertus Marbach, Oddur Ingolfsson
Summary: Motivated by the potential application of focused-electron-beam-induced deposition (FEBID) in plasmonic and detector technology, this study comprehensively investigated [Au(CH3)2Cl]2 as a potential precursor. The dissociation processes and composition of FEBID deposits were studied under single collision conditions and in an ultrahigh-vacuum (UHV) chamber. The results showed significant carbon loss and chlorine removal in the gas phase, while quantitative chlorine loss and desorption were observed in the UHV setup. The precursor was found stable at ambient conditions and suitable for use in HV instruments, producing deposits with high gold content.
BEILSTEIN JOURNAL OF NANOTECHNOLOGY
(2023)
Article
Nanoscience & Nanotechnology
John Lasseter, Philip D. Rack, Steven J. Randolph
Summary: In this study, a method for selectively depositing 3D nanostructures using photothermal transport is reported. The ability to initiate the process on sub-diffraction-limit nanoscale features is demonstrated. Thermal simulations show that the geometric shape and optical and thermal properties of the nanostructures are crucial for controlling the CVD reaction.
ACS APPLIED NANO MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Rajan Deepan Chakravarthy, Imam Sahroni, Chen-Wen Wang, Mohiuddin Mohammed, Hsin-Chieh Lin
Summary: Thermogel is an injectable biomaterial that can function at body temperature. We have developed a temperature-induced nanostructure transition system to create physical double-network supramolecular hydrogels that are injectable and thermoresponsive. These hydrogels have a high storage modulus and can support enhanced cell adhesion, showing potential for applications in tissue engineering and regenerative medicine.
Article
Nanoscience & Nanotechnology
Elif Bilgilisoy, Jo-Chi Yu, Christian Preischl, Lisa McElwee-White, Hans-Peter Steinrueck, Hubertus Marbach
Summary: The precise deposition of nanoscaled structures is crucial for nanomaterial applications. This study successfully fabricated clean and well-defined Ru nanomaterials using highly focused electron beam-induced deposition. The study found that the deposition process competed with the electron-induced etching, resulting in lower Ru content initially. However, with increasing electron doses, the Ru content increased and the etching process became less pronounced. This research expands the possibilities of engineering nanostructured materials.
ACS APPLIED NANO MATERIALS
(2022)
Article
Chemistry, Physical
Jacek J. Walkowiak, Casper van Duijnhoven, Pia Boeschen, Nadja A. Wolter, Joanna Michalska-Walkowiak, Martin Dulle, Andrij Pich
Summary: Raspberry-like poly(oligoethylene methacrylate-b-N-vinylcaprolactam)/polystyrene (POEGMA-b-PVCL/PS) patchy particles (PPs) and complex colloidal particle clusters (CCPCs) were successfully fabricated using a two-step or one-step cascade flow process. The internal structure and surface morphology of the particles were studied under different polymerization conditions. The use of a tubular flow reactor for photo-initiated reversible addition-fragmentation transfer precipitation polymerization (Photo-RPP) provided advantages over heat dissipation and homogeneous light distribution.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
Article
Nanoscience & Nanotechnology
Cristiano Glessi, Aya Mahgoub, Cornelis W. Hagen, Mats Tilset
Summary: Seven gold(I) N-heterocyclic carbene complexes were synthesized, characterized, and tested as precursors for focused electron beam-induced deposition. The research showed that the most suitable organic ligand for the gold precursor is triazole-based, while the most suitable anionic ligand is the trifluoromethyl group.
BEILSTEIN JOURNAL OF NANOTECHNOLOGY
(2021)
Article
Chemistry, Multidisciplinary
Matthew G. Boebinger, Courtney Brea, Li-Ping Ding, Sudhajit Misra, Olugbenga Olunloyo, Yiling Yu, Kai Xiao, Andrew R. Lupini, Feng Ding, Guoxiang Hu, Panchapakesan Ganesh, Stephen Jesse, Raymond R. Unocic
Summary: An automated and feedback-controlled atomic fabrication method is developed to create 1D-2D heterostructures in MoS2 with atomic precision. The shape and symmetry of the scanning pathway can be controlled using an aberration-corrected scanning transmission electron microscope. Density functional theory calculations and ab initio molecular dynamic simulations are used to study the energetic barriers for atomic edge structures and transformation pathways. This work provides an automated method for understanding atomic-scale transformations and enables more precise atomic-scale engineering of materials.
ADVANCED MATERIALS
(2023)
Article
Oncology
Jong Min Park, Jung-In Kim, Hong-Gyun Wu
Summary: Charted-particle therapy offers localized doses to tumors and minimizes doses to normal tissues. Carbon-ion radiotherapy has become mainstream in cancer treatment using heavy ions, with continuous technological advancements and ongoing global research.
CANCER RESEARCH AND TREATMENT
(2021)
Article
Engineering, Chemical
Yuan Yao, Jesse Capecelatro
Summary: This study presents a numerical framework for accurately computing electrically charged particles in wall-bounded flows, removing the contribution from periodic images by agnostically solving the electric Poisson equation and strategically mapping particle charges to the grid, while enforcing appropriate boundary conditions using a signed-distance levelset function.
Article
Chemistry, Physical
Yalin Feng, Xingyun Chen, Yongcun Ma, Shusen Peng
Summary: The research focuses on designing a silanized GO coating with an orderly layered nanostructure on metal surfaces to achieve excellent long-term durability. By utilizing amino-functionalized silane and cathodic electrophoretic deposition, the optimized coating showed outstanding protective performance even after prolonged immersion in a NaCl solution. The long-term durability is attributed to the inherent impermeability of graphene and the stability crosslinking bond induced by the orderly stacking of GO nanosheets.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2021)
Article
Oncology
Kyung Su Kim, Hong-Gyun Wu
Summary: Charged-particle therapy, such as proton beam therapy and carbon-ion radiotherapy, has physical and biological advantages over conventional photon radiotherapy, particularly in treating pediatric cancer and radioresistant tumors. However, high setup costs and lack of clinical evidence hinder widespread adoption. Clinical studies are being conducted to increase the number of patients who can benefit from charged-particle therapy despite its high cost.
CANCER RESEARCH AND TREATMENT
(2021)
Article
Multidisciplinary Sciences
Yurun Miao, Dennis T. Lee, Matheus Dorneles de Mello, Mueed Ahmad, Mohammed K. Abdel-Rahman, Patrick M. Eckhert, J. Anibal Boscoboinik, D. Howard Fairbrother, Michael Tsapatsis
Summary: The authors report a solvent-free bottom-up approach for the patterning of zeolitic imidazolate frameworks; well-resolved patterns with features down to the scale of 100 nm can be achieved.
NATURE COMMUNICATIONS
(2022)
Article
Chemistry, Inorganic & Nuclear
Christopher R. Brewer, Nicholas C. Sheehan, Jessica Herrera, Amy Walker, Lisa McElwee-White
Summary: Solution phase photochemical experiments showed that (eta 4-diene)-Ru(CO)3 complexes can be used as precursors for photoassisted chemical vapor deposition of ruthenium by losing both diene and CO ligands. The quantum yields of ligand loss were found to depend on the structure of the diene, and subsequent ligand loss was determined to occur from secondary photolysis. The compounds exhibited little luminescence, indicating that radiative decay of the excited states was not competitive with photochemical ligand loss. Additionally, the formation of colloidal Ru species was observed after irradiation in hydrocarbon solutions in the absence of phosphite.
Article
Nanoscience & Nanotechnology
Elif Bilgilisoy, Jo-Chi Yu, Christian Preischl, Lisa McElwee-White, Hans-Peter Steinrueck, Hubertus Marbach
Summary: The precise deposition of nanoscaled structures is crucial for nanomaterial applications. This study successfully fabricated clean and well-defined Ru nanomaterials using highly focused electron beam-induced deposition. The study found that the deposition process competed with the electron-induced etching, resulting in lower Ru content initially. However, with increasing electron doses, the Ru content increased and the etching process became less pronounced. This research expands the possibilities of engineering nanostructured materials.
ACS APPLIED NANO MATERIALS
(2022)
Article
Chemistry, Physical
Mohammed K. Abdel-Rahman, Patrick M. Eckhert, D. Howard Fairbrother
Summary: Ion-beam-induced deposition using Me3PtCpMe was studied through a combination of UHV surface science research and SEM data. The experiments showed that ion-induced deposition reaction cross sections are approximately two orders of magnitude greater, resulting in deposits with PtC5 stoichiometry. Ion-induced deposition also led to bimolecular methyl radical coupling to produce ethane.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Editorial Material
Chemistry, Inorganic & Nuclear
Rakeshwar Bandichhor, A. S. Borovik, Martin D. Eastgate, Nora S. Radu, Feng Shi, Lisa McElwee-White
INORGANIC CHEMISTRY
(2023)
Editorial Material
Chemistry, Organic
Rakeshwar Bandichhor, A. S. Borovik, Ana de Bettencourt-Dias, Martin D. Eastgate, Nora S. Radu, Feng Shi, Lisa McElwee-White
JOURNAL OF ORGANIC CHEMISTRY
(2023)
Editorial Material
Chemistry, Organic
Rakeshwar Bandichhor, A. S. Borovik, Ana de Bettencourt-Dias, Martin D. Eastgate, Nora S. Radu, Feng Shi, Lisa McElwee-White
Editorial Material
Chemistry, Applied
Rakeshwar Bandichhor, A. S. Borovik, Ana de Bettencourt-Dias, Martin D. Eastgate, Nora S. Radu, Feng Shi, Lisa McElwee-White
ORGANIC PROCESS RESEARCH & DEVELOPMENT
(2023)
Editorial Material
Chemistry, Inorganic & Nuclear
Rakeshwar Bandichhor, A. S. Borovik, Ana de Bettencourt-Dias, Martin D. Eastgate, Nora S. Radu, Feng Shi, Lisa McElwee-White
Article
Nanoscience & Nanotechnology
Swapnil B. Ambade, Laura A. Kesner, Mohammed K. Abdel-Rahman, D. Howard Fairbrother, Zeev Rosenzweig
Summary: MXenes are ultrathin two-dimensional transition-metal carbides, nitrides, and carbonitrides that are steadily advancing as novel inorganic nanosystems for a broad range of applications. Their high conductivity, solution processability, hydrophilic nature, and various surface functional groups enable their use in aqueous systems. However, their interactions with common aqueous solution constituents need to be better understood for successful applications in aqueous systems.
ACS APPLIED NANO MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Ian M. Germaine, Mary B. Huttel, Molly P. Alderman, Lisa McElwee-White
Summary: Comparisons were made between aerosol-assisted chemical vapor deposition of MoS2 films from solutions containing single-source precursors and coreactant solution, indicating the significance of ligand precoordination on film properties. Raman spectra and GI-XRD patterns showed that the single-source precursors resulted in more intense and sharper signals for 2H-MoS2, suggesting improved crystallinity. SEM and XPS analysis were also conducted to evaluate morphology and composition. Thermolysis of the single-source precursors indicated the generation of a terminal sulfido on the molybdenum center with loss of a heteroatom stabilized carbene.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Nanoscience & Nanotechnology
Thomas E. Shaw, Zahra Ali, Taylor M. Currie, S. Novia Berriel, Brian Butkus, J. Tyler Wagner, Konstantin Preradovic, Glenn P. A. Yap, Jennifer C. Green, Parag Banerjee, Alfred P. Sattelberger, Lisa McElwee-White, Titel Jurca
Summary: The synthesis, characterization, and thermogravimetric analysis of tris(N,N'-di-isopropylacetamidinate)molybdenum(III) (Mo(iPr-AMD)(3)) are reported. Mo(iPr-AMD)(3) is a rare example of a homoleptic mononuclear complex of molybdenum(III) and fills a longstanding gap in the literature of transition metal(III) trisamidinate complexes. Thermogravimetric analysis reveals excellent volatilization at elevated temperatures, indicating potential applications as a precursor for vapor phase deposition of Mo-based materials. The potential of Mo(iPr-AMD)(3) as a stable, high-temperature precursor for both chemical vapor deposition (CVD) and atomic layer deposition (ALD) processes is demonstrated. Overall, a rating of 8 out of 10 is given to this article.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Optics
Ali Kamali, Will G. Carden, Jodie V. Johnson, Lisa McElwee-White, O. Ingolfsson
Summary: Appreciable effort is being made to design suitable organometallic precursors for metallic nanostructure fabrication using focused electron beam induced deposition (FEBID), which has great potential for 3D patterning. The initial interaction of the potential precursor with low energy electrons is crucial for determining the composition of the resulting deposits. This study explores the low energy electron-induced fragmentation of CF3AuCNC(CH3)(3) in the gas phase and compares it with the composition of deposits formed under FEBID conditions.
EUROPEAN PHYSICAL JOURNAL D
(2023)
Article
Chemistry, Inorganic & Nuclear
Saleh Muhammad, Erik T. Ferenczy, Ian M. Germaine, J. Tyler Wagner, Muhammad T. Jan, Lisa McElwee-White
Summary: In this study, Tetrakis(dithiocarboxylato)molybdenum(iv) complexes were synthesized and characterized as precursors for the aerosol assisted chemical vapor deposition (AACVD) of MoS2 thin films. The thermal behavior of the complexes was suitable for AACVD, and MoS2 thin films were successfully grown using Mo(S2CMe)(4) as a precursor in toluene solution. The films exhibited a 2H-MoS2 structure with vertically oriented morphology and a thickness of 2.54 μm, which was confirmed by various characterization techniques including GIXRD, XPS, EDS, and FE-SEM. The Raman E-2g(1) and A(1g) vibrational modes of crystalline 2H-MoS2 were also observed.
DALTON TRANSACTIONS
(2022)
Article
Biochemistry & Molecular Biology
Maicol Cipriani, Styrmir Svavarsson, Filipe Ferreira da Silva, Hang Lu, Lisa McElwee-White, Oddur Ingolfsson
Summary: Platinum coordination complexes are widely used as chemotherapeutic anticancer drugs and precursors in focused electron beam induced deposition. This study investigates the role of low-energy electrons in the fragmentation pathways of Pt(II) coordination compounds, highlighting the dominance of dissociative electron attachment in CO loss with low-energy electrons.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2021)
