1
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Butrymowicz-Kubiak A, Muzioł TM, Kaczmarek-Kędziera A, Jureddy CS, Maćkosz K, Utke I, Szymańska IB. New palladium(II) β-ketoesterates for focused electron beam induced deposition: synthesis, structures, and characterization. Dalton Trans 2024. [PMID: 39087858 DOI: 10.1039/d4dt01287a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/02/2024]
Abstract
We report the synthesis and characterization of new palladium(II) β-ketoesterate complexes [Pd(CH3COCHCO2R)2] with alkyl substituents R = tBu, iPr, Et. These compounds can have potential use in focused electron beam induced deposition (FEBID), which is a direct write method for the growth of structures at the nanoscale. However, it is still a major challenge to obtain deposits with a high metal content, and new precursor molecules are needed to overcome this. Single crystal X-ray diffraction, infrared spectroscopy, nuclear magnetic resonance spectroscopy, and density-functional theory calculations were used to confirm the compounds' composition and structure. Using thermal analysis and sublimation experiments, we investigate their thermal stability and volatility. These studies show that the palladium complexes sublimate over the range 348-353 K under 10-2 mbar pressure. The electron-induced decomposition of the complex molecules in the gas phase and their thin layers on silicon substrates were analysed using electron impact mass spectrometry (EI MS) and microscopy studies (SEM/EDX). They confirm that the precursor electron-induced fragmentation depends on the molecular structure. The obtained results reveal that [Pd(CH3COCHCO2tBu)2] with cis-positioned tert-butyl groups may be a promising FEBID precursor, and we carried out preliminary deposition experiments using this compound.
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Affiliation(s)
- A Butrymowicz-Kubiak
- Faculty of Chemistry, Nicolaus Copernicus University in Toruń, Gagarina 7, 87-100 Toruń, Poland.
| | - T M Muzioł
- Faculty of Chemistry, Nicolaus Copernicus University in Toruń, Gagarina 7, 87-100 Toruń, Poland.
| | - A Kaczmarek-Kędziera
- Faculty of Chemistry, Nicolaus Copernicus University in Toruń, Gagarina 7, 87-100 Toruń, Poland.
| | - C S Jureddy
- Empa - Swiss Federal Laboratories for Materials Science and Technology, Laboratory for Mechanics of Materials and Nanostructures, Feuerwerkerstrasse 39, CH - 3602 Thun, Switzerland
| | - K Maćkosz
- Empa - Swiss Federal Laboratories for Materials Science and Technology, Laboratory for Mechanics of Materials and Nanostructures, Feuerwerkerstrasse 39, CH - 3602 Thun, Switzerland
| | - I Utke
- Empa - Swiss Federal Laboratories for Materials Science and Technology, Laboratory for Mechanics of Materials and Nanostructures, Feuerwerkerstrasse 39, CH - 3602 Thun, Switzerland
| | - I B Szymańska
- Faculty of Chemistry, Nicolaus Copernicus University in Toruń, Gagarina 7, 87-100 Toruń, Poland.
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2
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Bae J, Yoo C, Yoon SY, Seol SK, Pyo J. Emission Directionality of 3D-Printed Photonic Nanowires. ACS NANO 2024; 18:16265-16273. [PMID: 38864726 DOI: 10.1021/acsnano.4c02820] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2024]
Abstract
Photonic devices can be advanced by increasing the density of the integrated optical components. As the integration density increases, the potential for signal interference between adjacent components, optical crosstalk, becomes a concern. To address the crosstalk issue, it is crucial to identify the emission directionality of the integrated optical components. In this study, we investigate the emission directionality of 3D printed light-emitting nano/microwires. We experimentally and numerically showed that when the diameter is reduced below the single-mode cutoff, the emission becomes noticeably directional. In addition, our demonstrations on pairs of closely positioned wires show that optical crosstalk can be effectively avoided by reducing the diameter to the nanoscale to exploit the strong directionality of its emission. We expect that our study can be applied to various fundamental research and applications in the fields of photonics, optical communication, sensing, and imaging, where the directionality of the emissions is crucial.
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Affiliation(s)
- Jongcheon Bae
- Smart 3D Printing Research Team, Korea Electrotechnology Research Institute (KERI), Changwon 51543, Korea
- School of Materials Science and Engineering, Pusan National University, Busan 46241, Korea
| | - Chanbin Yoo
- Smart 3D Printing Research Team, Korea Electrotechnology Research Institute (KERI), Changwon 51543, Korea
- Electric Energy & Materials Engineering, KERI School, University of Science and Technology (UST), Changwon 51543, Korea
| | - Seog-Young Yoon
- School of Materials Science and Engineering, Pusan National University, Busan 46241, Korea
| | - Seung Kwon Seol
- Smart 3D Printing Research Team, Korea Electrotechnology Research Institute (KERI), Changwon 51543, Korea
- Electric Energy & Materials Engineering, KERI School, University of Science and Technology (UST), Changwon 51543, Korea
| | - Jaeyeon Pyo
- Smart 3D Printing Research Team, Korea Electrotechnology Research Institute (KERI), Changwon 51543, Korea
- Electric Energy & Materials Engineering, KERI School, University of Science and Technology (UST), Changwon 51543, Korea
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3
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Jurczyk J, Pillatsch L, Berger L, Priebe A, Madajska K, Kapusta C, Szymańska IB, Michler J, Utke I. In Situ Time-of-Flight Mass Spectrometry of Ionic Fragments Induced by Focused Electron Beam Irradiation: Investigation of Electron Driven Surface Chemistry inside an SEM under High Vacuum. NANOMATERIALS (BASEL, SWITZERLAND) 2022; 12:2710. [PMID: 35957140 PMCID: PMC9370286 DOI: 10.3390/nano12152710] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/15/2022] [Revised: 07/22/2022] [Accepted: 07/29/2022] [Indexed: 06/15/2023]
Abstract
Recent developments in nanoprinting using focused electron beams have created a need to develop analysis methods for the products of electron-induced fragmentation of different metalorganic compounds. The original approach used here is termed focused-electron-beam-induced mass spectrometry (FEBiMS). FEBiMS enables the investigation of the fragmentation of electron-sensitive materials during irradiation within the typical primary electron beam energy range of a scanning electron microscope (0.5 to 30 keV) and high vacuum range. The method combines a typical scanning electron microscope with an ion-extractor-coupled mass spectrometer setup collecting the charged fragments generated by the focused electron beam when impinging on the substrate material. The FEBiMS of fragments obtained during 10 keV electron irradiation of grains of silver and copper carboxylates and shows that the carboxylate ligand dissociates into many smaller volatile fragments. Furthermore, in situ FEBiMS was performed on carbonyls of ruthenium (solid) and during electron-beam-induced deposition, using tungsten carbonyl (inserted via a gas injection system). Loss of carbonyl ligands was identified as the main channel of dissociation for electron irradiation of these carbonyl compounds. The presented results clearly indicate that FEBiMS analysis can be expanded to organic, inorganic, and metal organic materials used in resist lithography, ice (cryo-)lithography, and focused-electron-beam-induced deposition and becomes, thus, a valuable versatile analysis tool to study both fundamental and process parameters in these nanotechnology fields.
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Affiliation(s)
- Jakub Jurczyk
- Laboratory for Mechanics of Materials and Nanostructures, Empa-Swiss Federal Laboratories for Materials Science and Technology, Feuerwerkerstrasse 39, CH-3602 Thun, Switzerland
- Faculty of Physics and Applied Computer Science, AGH University of Science and Technology Krakow, Al. Mickiewicza 30, 30-059 Kraków, Poland
| | - Lex Pillatsch
- TOFWERK AG, Schorenstrasse 39, CH-3645 Thun, Switzerland
| | - Luisa Berger
- Laboratory for Mechanics of Materials and Nanostructures, Empa-Swiss Federal Laboratories for Materials Science and Technology, Feuerwerkerstrasse 39, CH-3602 Thun, Switzerland
| | - Agnieszka Priebe
- Laboratory for Mechanics of Materials and Nanostructures, Empa-Swiss Federal Laboratories for Materials Science and Technology, Feuerwerkerstrasse 39, CH-3602 Thun, Switzerland
| | - Katarzyna Madajska
- Faculty of Chemistry, Nicolaus Copernicus University in Toruń, Gagarina 7, 87-100 Toruń, Poland
| | - Czesław Kapusta
- Faculty of Physics and Applied Computer Science, AGH University of Science and Technology Krakow, Al. Mickiewicza 30, 30-059 Kraków, Poland
| | - Iwona B. Szymańska
- Faculty of Chemistry, Nicolaus Copernicus University in Toruń, Gagarina 7, 87-100 Toruń, Poland
| | - Johann Michler
- Laboratory for Mechanics of Materials and Nanostructures, Empa-Swiss Federal Laboratories for Materials Science and Technology, Feuerwerkerstrasse 39, CH-3602 Thun, Switzerland
| | - Ivo Utke
- Laboratory for Mechanics of Materials and Nanostructures, Empa-Swiss Federal Laboratories for Materials Science and Technology, Feuerwerkerstrasse 39, CH-3602 Thun, Switzerland
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4
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Salvador-Porroche A, Herrer L, Sangiao S, de Teresa JM, Cea P. Low-resistivity Pd nanopatterns created by a direct electron beam irradiation process free of post-treatment steps. NANOTECHNOLOGY 2022; 33:405302. [PMID: 34983030 DOI: 10.1088/1361-6528/ac47cf] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/14/2021] [Accepted: 01/04/2022] [Indexed: 05/28/2023]
Abstract
The ability to create metallic patterned nanostructures with excellent control of size, shape and spatial orientation is of utmost importance in the construction of next-generation electronic and optical devices as well as in other applications such as (bio)sensors, reactive surfaces for catalysis, etc. Moreover, development of simple, rapid and low-cost fabrication processes of metallic patterned nanostructures is a challenging issue for the incorporation of such devices in real market applications. In this contribution, a direct-write method that results in highly conducting palladium-based nanopatterned structures without the need of applying subsequent curing processes is presented. Spin-coated films of palladium acetate were irradiated with an electron beam to produce palladium nanodeposits (PdNDs) with controlled size, shape and height. The use of different electron doses was investigated and its influence on the PdNDs features determined, namely: (1) thickness of the deposits, (2) atomic percentage of palladium content, (3) oxidation state of palladium in the deposit, (4) morphology of the sample and grain size of the Pd nanocrystals and (5) resistivity. It has been probed that the use of high electron doses, 30000μC cm-2results in the lowest resistivity reported to date for PdNDs, namely 145μΩ cm, which is only one order of magnitude higher than bulk palladium. This result paves the way for development of simplified lithography processes of nanostructured deposits avoiding subsequent post-treatment steps.
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Affiliation(s)
- Alba Salvador-Porroche
- Instituto de Nanociencia y Materiales de Aragón (INMA), CSIC-Universidad de Zaragoza, E-50009 Zaragoza, Spain
- Departamento de Física de la Materia Condensada, Facultad de Ciencias, Universidad de Zaragoza, E-50009 Zaragoza, Spain
- Laboratorio de Microscopías avanzadas (LMA), Universidad de Zaragoza, E-50018 Zaragoza, Spain
| | - Lucía Herrer
- Instituto de Nanociencia y Materiales de Aragón (INMA), CSIC-Universidad de Zaragoza, E-50009 Zaragoza, Spain
- Laboratorio de Microscopías avanzadas (LMA), Universidad de Zaragoza, E-50018 Zaragoza, Spain
| | - Soraya Sangiao
- Instituto de Nanociencia y Materiales de Aragón (INMA), CSIC-Universidad de Zaragoza, E-50009 Zaragoza, Spain
- Departamento de Física de la Materia Condensada, Facultad de Ciencias, Universidad de Zaragoza, E-50009 Zaragoza, Spain
- Laboratorio de Microscopías avanzadas (LMA), Universidad de Zaragoza, E-50018 Zaragoza, Spain
| | - José María de Teresa
- Instituto de Nanociencia y Materiales de Aragón (INMA), CSIC-Universidad de Zaragoza, E-50009 Zaragoza, Spain
- Departamento de Física de la Materia Condensada, Facultad de Ciencias, Universidad de Zaragoza, E-50009 Zaragoza, Spain
- Laboratorio de Microscopías avanzadas (LMA), Universidad de Zaragoza, E-50018 Zaragoza, Spain
| | - Pilar Cea
- Instituto de Nanociencia y Materiales de Aragón (INMA), CSIC-Universidad de Zaragoza, E-50009 Zaragoza, Spain
- Laboratorio de Microscopías avanzadas (LMA), Universidad de Zaragoza, E-50018 Zaragoza, Spain
- Departamento de Química Física, Facultad de Ciencias, Universidad de Zaragoza, E-50009 Zaragoza, Spain
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5
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Salvador-Porroche A, Herrer L, Sangiao S, Philipp P, Cea P, María De Teresa J. High-Throughput Direct Writing of Metallic Micro- and Nano-Structures by Focused Ga + Beam Irradiation of Palladium Acetate Films. ACS APPLIED MATERIALS & INTERFACES 2022; 14:28211-28220. [PMID: 35671475 PMCID: PMC9227716 DOI: 10.1021/acsami.2c05218] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
Metallic nanopatterns are ubiquitous in applications that exploit the electrical conduction at the nanoscale, including interconnects, electrical nanocontacts, and small gaps between metallic pads. These metallic nanopatterns can be designed to show additional physical properties (optical transparency, plasmonic effects, ferromagnetism, superconductivity, heat evacuation, etc.). For these reasons, an intense search for novel lithography methods using uncomplicated processes represents a key on-going issue in the achievement of metallic nanopatterns with high resolution and high throughput. In this contribution, we introduce a simple methodology for the efficient decomposition of Pd3(OAc)6 spin-coated thin films by means of a focused Ga+ beam, which results in metallic-enriched Pd nanostructures. Remarkably, the usage of a charge dose as low as 30 μC/cm2 is sufficient to fabricate structures with a metallic Pd content above 50% (at.) exhibiting low electrical resistivity (70 μΩ·cm). Binary-collision-approximation simulations provide theoretical support to this experimental finding. Such notable behavior is used to provide three proof-of-concept applications: (i) creation of electrical contacts to nanowires, (ii) fabrication of small (40 nm) gaps between large metallic contact pads, and (iii) fabrication of large-area metallic meshes. The impact across several fields of the direct decomposition of spin-coated organometallic films by focused ion beams is discussed.
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Affiliation(s)
- Alba Salvador-Porroche
- Instituto
de Nanociencia y Materiales de Aragón (INMA), CSIC-Universidad de Zaragoza, Zaragoza 50009, Spain
| | - Lucía Herrer
- Instituto
de Nanociencia y Materiales de Aragón (INMA), CSIC-Universidad de Zaragoza, Zaragoza 50009, Spain
| | - Soraya Sangiao
- Instituto
de Nanociencia y Materiales de Aragón (INMA), CSIC-Universidad de Zaragoza, Zaragoza 50009, Spain
- Laboratorio
de Microscopías Avanzadas (LMA), Universidad de Zaragoza, Zaragoza 50018, Spain
| | - Patrick Philipp
- Advanced
Instrumentation for Nano-Analytics (AINA), MRT Department, Luxembourg Institute of Science and Technology (LIST), 41 rue du Brill, Belvaux 4422, Luxembourg
| | - Pilar Cea
- Instituto
de Nanociencia y Materiales de Aragón (INMA), CSIC-Universidad de Zaragoza, Zaragoza 50009, Spain
- Laboratorio
de Microscopías Avanzadas (LMA), Universidad de Zaragoza, Zaragoza 50018, Spain
| | - José María De Teresa
- Instituto
de Nanociencia y Materiales de Aragón (INMA), CSIC-Universidad de Zaragoza, Zaragoza 50009, Spain
- Laboratorio
de Microscopías Avanzadas (LMA), Universidad de Zaragoza, Zaragoza 50018, Spain
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6
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Xu B, Zhang Y, Li L, Shao Q, Huang X. Recent progress in low-dimensional palladium-based nanostructures for electrocatalysis and beyond. Coord Chem Rev 2022. [DOI: 10.1016/j.ccr.2021.214388] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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7
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Zhang G, Zeng H, Liu J, Nagashima K, Takahashi T, Hosomi T, Tanaka W, Yanagida T. Nanowire-based sensor electronics for chemical and biological applications. Analyst 2021; 146:6684-6725. [PMID: 34667998 DOI: 10.1039/d1an01096d] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Detection and recognition of chemical and biological species via sensor electronics are important not only for various sensing applications but also for fundamental scientific understanding. In the past two decades, sensor devices using one-dimensional (1D) nanowires have emerged as promising and powerful platforms for electrical detection of chemical species and biologically relevant molecules due to their superior sensing performance, long-term stability, and ultra-low power consumption. This paper presents a comprehensive overview of the recent progress and achievements in 1D nanowire synthesis, working principles of nanowire-based sensors, and the applications of nanowire-based sensor electronics in chemical and biological analytes detection and recognition. In addition, some critical issues that hinder the practical applications of 1D nanowire-based sensor electronics, including device reproducibility and selectivity, stability, and power consumption, will be highlighted. Finally, challenges, perspectives, and opportunities for developing advanced and innovative nanowire-based sensor electronics in chemical and biological applications are featured.
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Affiliation(s)
- Guozhu Zhang
- Department of Applied Chemistry, Graduate School of Engineering, The University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo, 113-8654, Japan.
| | - Hao Zeng
- Department of Applied Chemistry, Graduate School of Engineering, The University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo, 113-8654, Japan.
| | - Jiangyang Liu
- Department of Applied Chemistry, Graduate School of Engineering, The University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo, 113-8654, Japan.
| | - Kazuki Nagashima
- Department of Applied Chemistry, Graduate School of Engineering, The University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo, 113-8654, Japan. .,JST-PRESTO, 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan
| | - Tsunaki Takahashi
- Department of Applied Chemistry, Graduate School of Engineering, The University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo, 113-8654, Japan. .,JST-PRESTO, 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan
| | - Takuro Hosomi
- Department of Applied Chemistry, Graduate School of Engineering, The University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo, 113-8654, Japan. .,JST-PRESTO, 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan
| | - Wataru Tanaka
- Department of Applied Chemistry, Graduate School of Engineering, The University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo, 113-8654, Japan.
| | - Takeshi Yanagida
- Department of Applied Chemistry, Graduate School of Engineering, The University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo, 113-8654, Japan. .,Institute for Materials Chemistry and Engineering, Kyushu University, 6-1 Kasuga-Koen, Kasuga, Fukuoka, 816-8580, Japan
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8
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Berger L, Jurczyk J, Madajska K, Szymańska IB, Hoffmann P, Utke I. Room Temperature Direct Electron Beam Lithography in a Condensed Copper Carboxylate. MICROMACHINES 2021; 12:580. [PMID: 34065297 PMCID: PMC8161174 DOI: 10.3390/mi12050580] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/01/2021] [Revised: 05/14/2021] [Accepted: 05/15/2021] [Indexed: 11/17/2022]
Abstract
High-resolution metallic nanostructures can be fabricated with multistep processes, such as electron beam lithography or ice lithography. The gas-assisted direct-write technique known as focused electron beam induced deposition (FEBID) is more versatile than the other candidates. However, it suffers from low throughput. This work presents the combined approach of FEBID and the above-mentioned lithography techniques: direct electron beam lithography (D-EBL). A low-volatility copper precursor is locally condensed onto a room temperature substrate and acts as a positive tone resist. A focused electron beam then directly irradiates the desired patterns, leading to local molecule dissociation. By rinsing or sublimation, the non-irradiated precursor is removed, leaving copper-containing structures. Deposits were formed with drastically enhanced growth rates than FEBID, and their composition was found to be comparable to gas-assisted FEBID structures. The influence of electron scattering within the substrate as well as implementing a post-purification protocol were studied. The latter led to the agglomeration of high-purity copper crystals. We present this as a new approach to electron beam-induced fabrication of metallic nanostructures without the need for cryogenic or hot substrates. D-EBL promises fast and easy fabrication results.
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Affiliation(s)
- Luisa Berger
- Empa—Swiss Federal Laboratories for Materials Science and Technology, Laboratory for Mechanics of Materials and Nanostructures, Feuerwerkerstrasse 39, 3602 Thun, Switzerland; (L.B.); (J.J.)
| | - Jakub Jurczyk
- Empa—Swiss Federal Laboratories for Materials Science and Technology, Laboratory for Mechanics of Materials and Nanostructures, Feuerwerkerstrasse 39, 3602 Thun, Switzerland; (L.B.); (J.J.)
- Faculty of Physics and Applied Computer Science, AGH University of Science and Technology Krakow, Al. Mickiewicza 30, 30-059 Kraków, Poland
| | - Katarzyna Madajska
- Department of Chemistry, Nicolaus Copernicus University, Gagarina 7, 87-100 Toruń, Poland; (K.M.); (I.B.S.)
| | - Iwona B. Szymańska
- Department of Chemistry, Nicolaus Copernicus University, Gagarina 7, 87-100 Toruń, Poland; (K.M.); (I.B.S.)
| | - Patrik Hoffmann
- Empa—Swiss Federal Laboratories for Materials Science and Technology, Laboratory for Advanced Materials Processing, Feuerwerkerstrasse 39, 3602 Thun, Switzerland;
| | - Ivo Utke
- Empa—Swiss Federal Laboratories for Materials Science and Technology, Laboratory for Mechanics of Materials and Nanostructures, Feuerwerkerstrasse 39, 3602 Thun, Switzerland; (L.B.); (J.J.)
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9
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Taal AJ, Rabinowitz J, Shepard KL. mr-EBL: ultra-high sensitivity negative-tone electron beam resist for highly selective silicon etching and large-scale direct patterning of permanent structures. NANOTECHNOLOGY 2021; 32:245302. [PMID: 33706291 DOI: 10.1088/1361-6528/abeded] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/08/2020] [Accepted: 03/11/2021] [Indexed: 06/12/2023]
Abstract
Electron beam lithography (EBL) is the state-of-the-art technique for rapid prototyping of nanometer-scale devices. Even so, processing speeds remain limited for the highest resolution patterning. Here, we establish Mr-EBL as the highest throughput negative tone electron-beam-sensitive resist. The 10μC cm-2dose requirement enables fabricating a 100 mm2photonic diffraction grating in a ten minute EBL process. Optimized processing conditions achieve a critical resolution of 75 nm with 3× faster write speeds than SU-8 and 1-2 orders of magnitude faster write speeds than maN-2400 and hydrogen silsesquioxane. Notably, these conditions significantly differ from the manufacturers' recommendations for the recently commercialized Mr-EBL resist. We demonstrate Mr-EBL to be a robust negative etch mask by etching silicon trenches with aspect ratios of 10 and near-vertical sidewalls. Furthermore, our optimized processing conditions are suitable to direct patterning on integrated circuits or delicate nanofabrication stacks, in contrast to other negative tone EBL resists. In conclusion, Mr-EBL is a highly attractive EBL resist for rapid prototyping in nanophotonics, MEMS, and fluidics.
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Affiliation(s)
- Adriaan J Taal
- Electrical Engineering, Columbia University, New York, United States of America
| | - Jake Rabinowitz
- Electrical Engineering, Columbia University, New York, United States of America
| | - Kenneth L Shepard
- Electrical Engineering, Columbia University, New York, United States of America
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10
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Kumar A, Mohammadi MM, Swihart MT. Synthesis, growth mechanisms, and applications of palladium-based nanowires and other one-dimensional nanostructures. NANOSCALE 2019; 11:19058-19085. [PMID: 31433427 DOI: 10.1039/c9nr05835d] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
Palladium-based nanostructures have attracted the attention of researchers due to their useful catalytic properties and unique ability to form hydrides, which finds application in hydrogen storage and hydrogen detection. Palladium-based nanowires have some inherent advantages over other Pd nanomaterials, combining high surface-to-volume ratio with good thermal and electron transport properties, and exposing high-index crystal facets that can have enhanced catalytic activity. Over the past two decades, both synthesis methods and applications of 1D palladium nanostructures have advanced greatly. In this review, we start by discussing different types of 1D palladium nanostructures before moving on to the different synthesis approaches that can produce them. Next, we discuss factors including kinetic vs. thermodynamic control of growth, oxidative etching, and surface passivation that affect palladium nanowire synthesis. We also review efforts to gain insight into growth mechanisms using different characterization tools. We discuss the effects of concentration of capping agents, reducing agents, metal halides, pH, and sacrificial oxidation on the growth of Pd-based nanowires in solution, from shape control, to yield, to aspect ratio. Various applications of palladium and palladium alloy nanowires are then discussed, including electrocatalysis, hydrogen storage, and sensing of hydrogen and other chemicals. We conclude with a summary and some perspectives on future research directions for this category of nanomaterials.
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Affiliation(s)
- Abhishek Kumar
- Department of Chemical and Biological Engineering, University at Buffalo, The State University of New York, Buffalo, NY 14260, USA.
| | - Mohammad Moein Mohammadi
- Department of Chemical and Biological Engineering, University at Buffalo, The State University of New York, Buffalo, NY 14260, USA.
| | - Mark T Swihart
- Department of Chemical and Biological Engineering, University at Buffalo, The State University of New York, Buffalo, NY 14260, USA. and RENEW Institute, University at Buffalo, The State University of New York, Buffalo, NY 14260, USA
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11
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Bi K, Chen Y, Wan Q, Ye T, Xiang Q, Zheng M, Wang X, Liu Q, Zhang G, Li Y, Liu Y, Duan H. Direct electron-beam patterning of transferrable plasmonic gold nanoparticles using a HAuCl 4/PVP composite resist. NANOSCALE 2019; 11:1245-1252. [PMID: 30601520 DOI: 10.1039/c8nr09254k] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Reliable fabrication of gold nanoparticles with desirable size, geometry and spatial arrangement is essential for plasmonic applications. A common fabrication flow usually involves electron-beam lithography and a vacuum-evaporation-based lift-off process or etching. In this work, we evaluate an alternative approach to directly fabricate a plasmonic gold nanoparticle array without involving the vacuum evaporation process by using a chloroauric acid/poly(vinyl pyrrolidone) (HAuCl4/PVP) hybrid as a functional electron-beam resist. Systematic experiments were conducted to investigate the patterning behaviors in the fabrication process. With the optimized fabrication parameters, we show that the HAuCl4/PVP composite resist has a high patterning resolution and pure gold nanoparticles with tens of nanometers can be obtained after an annealing-based pyrolysis process. More particularly, compared to the patterned plasmonic gold nanoparticles obtained by conventional methods, the gold nanoparticles fabricated by our method can be transferred to soft substrates due to the absence of an adhesion layer, enabling various potential applications in flexible and stretchable optics. As an example, we demonstrated that the transferred gold nanoparticle array can be conformably assembled onto a flat gold surface to form a particle-on-film structure for surface-enhanced Raman scattering (SERS) applications.
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Affiliation(s)
- Kaixi Bi
- School of Physics and Electronics, State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha 410082, China
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12
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Pita IA, Kumbham M, Schmidt M, Gleeson M, Ryan KM, Silien C, Liu N. Surface plasmon propagation enhancement via bowtie antenna incorporation in Au-mica block waveguides. APPLIED OPTICS 2018; 57:E50-E56. [PMID: 30117921 DOI: 10.1364/ao.57.000e50] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/26/2018] [Accepted: 05/21/2018] [Indexed: 06/08/2023]
Abstract
The optimum geometry for waveguide propagation was determined by comparing bowtie and semicircle antenna cuts to a standard plain waveguide with a 635 nm laser. The results of both experimental data and COMSOL simulations proved that the bowtie antenna increased waveguide output in comparison to the plain waveguide with the semicircle pattern showing no enhancement. It was also determined that the propagation was highest when the polarization direction of the laser was perpendicular to the direction of the waveguide for all patterns, while polarization along the propagation direction led to little or no output in all antenna and plain waveguide cases. The waveguide output of the bowtie antenna and plain structures was then measured using a tunable laser for wavelengths from 570 nm to 958 nm under both parallel and perpendicular polarization conditions. The results indicated that the bowtie antenna performed better over the entire range with an average increase factor of 2.12±0.40 over the plain waveguide pattern when perpendicularly polarized to the waveguide direction, and 1.10±0.48 when parallel. The measured values indicate that the structure could have applications in broadband devices.
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Bi K, Xiang Q, Chen Y, Shi H, Li Z, Lin J, Zhang Y, Wan Q, Zhang G, Qin S, Zhang X, Duan H. Direct patterning of highly-conductive graphene@copper composites using copper naphthenate as a resist for graphene device applications. NANOSCALE 2017; 9:16755-16763. [PMID: 29072744 DOI: 10.1039/c7nr05779b] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
We report an electron-beam lithography process to directly fabricate graphene@copper composite patterns without involving metal deposition, lift-off and etching processes using copper naphthenate as a high-resolution negative-tone resist. As a commonly used industrial painting product, copper naphthenate is extremely cheap with a long shelf time but demonstrates an unexpected patterning resolution better than 10 nm. With appropriate annealing under a hydrogen atmosphere, the produced graphene@copper composite patterns show high conductivity of ∼400 S cm-1. X-ray diffraction, conformal Raman spectroscopy and X-ray photoelectron spectroscopy were used to analyze the chemical composition of the final patterns. With the properties of high resolution and high conductivity, the patterned graphene@copper composites could be used as conductive pads and interconnects for graphene electronic devices with ohmic contacts. Compared to common fabrication processes involving metal evaporation and lift-off steps, this pattern-transfer-free fabrication process using copper naphthenate resist is direct and simple but allows comparable device performance in practical device applications.
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Affiliation(s)
- Kaixi Bi
- School of Physics and Electronics, State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha 410082, China.
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14
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Palazon F, Prato M, Manna L. Writing on Nanocrystals: Patterning Colloidal Inorganic Nanocrystal Films through Irradiation-Induced Chemical Transformations of Surface Ligands. J Am Chem Soc 2017; 139:13250-13259. [PMID: 28772078 PMCID: PMC6284209 DOI: 10.1021/jacs.7b05888] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2017] [Indexed: 11/29/2022]
Abstract
In the past couple of decades, colloidal inorganic nanocrystals (NCs) and, more specifically, semiconductor quantum dots (QDs) have emerged as crucial materials for the development of nanoscience and nanotechnology, with applications in very diverse areas such as optoelectronics and biotechnology. Films made of inorganic NCs deposited on a substrate can be patterned by e-beam lithography, altering the structure of their capping ligands and thus allowing exposed areas to remain on the substrate while non-exposed areas are redispersed in a solvent, as in a standard lift-off process. This methodology can be described as a "direct" lithography process, since the exposure is performed directly on the material of interest, in contrast with conventional lithography which uses a polymeric resist as a mask for subsequent material deposition (or etching). A few reports from the late 1990s and early 2000s used such direct lithography to fabricate electrical wires from metallic NCs. However, the poor conductivity obtained through this process hindered the widespread use of the technique. In the early 2010s, the same method was used to define fluorescent patterns on QD films, allowing for further applications in biosensing. For the past 2-3 years, direct lithography on NC films with e-beams and X-rays has gone through an important development as it has been demonstrated that it can tune further transformations on the NCs, leading to more complex patternings and opening a whole new set of possible applications. This Perspective summarizes the findings of the past 20 years on direct lithography on NC films with a focus on the latest developments on QDs from 2014 and provides different potential future outcomes of this promising technique.
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Affiliation(s)
- Francisco Palazon
- Nanochemistry
Department and Materials Characterization Facility, Istituto
Italiano di Tecnologia, Via Morego 30, 16163 Genova, Italy
| | - Mirko Prato
- Nanochemistry
Department and Materials Characterization Facility, Istituto
Italiano di Tecnologia, Via Morego 30, 16163 Genova, Italy
| | - Liberato Manna
- Nanochemistry
Department and Materials Characterization Facility, Istituto
Italiano di Tecnologia, Via Morego 30, 16163 Genova, Italy
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15
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Mansilla C, Zondag Y, Mulders JJL, Trompenaars PHF. Comparison of Pd electron beam induced deposition using two precursors and an oxygen purification strategy. NANOTECHNOLOGY 2017; 28:375302. [PMID: 28617672 DOI: 10.1088/1361-6528/aa79e8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Focused electron beam induced deposition (FEBID) allows the creation of nanoscale structures through dissociation of an organo-metallic precursor by electrons at the beam impact point. The deposition of Pd can be interesting for its catalytic behavior and ability to contact carbon based materials. Two precursors were investigated-Pd(hfac)2 and (Cp)Pd(allyl)-and two deposition methods: with and without an in situ oxygen purification process. The deposition parameters can be tuned for the Pd(hfac)2 precursor to provide a deposition with 23 ± 2 at.% of Pd and a main component of C at 51 ± 3 at.% and minor components of O and F. An in situ purification process using O2 was much faster than expected and improved the Pd content to up to >65 at.% while reducing the C to ∼20 at.%, and avoiding the oxidation of Pd. The resistivity was ∼100 μOhm · cm and compares favorably with a bulk value of 10 μOhm · cm. The (Cp)Pd(allyl) precursor is interesting because it does not release fluorine during the deposition and hence it does not etch a possible substrate. Its FEBID deposition had a composition of 26 ± 5 at.% of Pd with 74 ± 5 at.% of C. The O2 purification process can improve the Pd content up to ∼60 at.% while reducing C to <20 at.%, but also increasing the O content to 18 at%, which was released afterwards. The best resistivity was measured at ∼1000 μOhm · cm, although better values can be anticipated for longer post treatment times.
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Uh K, Lee J, Kim T, Lee CW, Kim JM. Microscale Metallization on Conducting Polyaniline Patterns. B KOREAN CHEM SOC 2016. [DOI: 10.1002/bkcs.11010] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Kyungchan Uh
- Department of Chemical Engineering; Hanyang University; Seoul 04763 Korea
| | - Joosub Lee
- Department of Chemical Engineering; Hanyang University; Seoul 04763 Korea
| | - Taegeun Kim
- Department of Chemical Engineering; Hanyang University; Seoul 04763 Korea
| | - Chan Woo Lee
- Institute of Nano Science and Technology; Hanyang University; Seoul 04763 Korea
| | - Jong-Man Kim
- Department of Chemical Engineering; Hanyang University; Seoul 04763 Korea
- Institute of Nano Science and Technology; Hanyang University; Seoul 04763 Korea
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17
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Self-assembled nanostructured resistive switching memory devices fabricated by templated bottom-up growth. Sci Rep 2016; 6:18967. [PMID: 26739122 PMCID: PMC4704057 DOI: 10.1038/srep18967] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2015] [Accepted: 12/02/2015] [Indexed: 11/17/2022] Open
Abstract
Metal-oxide-based resistive switching memory device has been studied intensively due to its potential to satisfy the requirements of next-generation memory devices. Active research has been done on the materials and device structures of resistive switching memory devices that meet the requirements of high density, fast switching speed, and reliable data storage. In this study, resistive switching memory devices were fabricated with nano-template-assisted bottom up growth. The electrochemical deposition was adopted to achieve the bottom-up growth of nickel nanodot electrodes. Nickel oxide layer was formed by oxygen plasma treatment of nickel nanodots at low temperature. The structures of fabricated nanoscale memory devices were analyzed with scanning electron microscope and atomic force microscope (AFM). The electrical characteristics of the devices were directly measured using conductive AFM. This work demonstrates the fabrication of resistive switching memory devices using self-assembled nanoscale masks and nanomateirals growth from bottom-up electrochemical deposition.
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18
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Saifullah MSM, Ganesan R, Lim SH, Hussain H, Low HY. Large area sub-100 nm direct nanoimprinting of palladium nanostructures. RSC Adv 2016. [DOI: 10.1039/c6ra00234j] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
We demonstrate a simple direct nanoimprinting method for fabricating palladium nanostructures that involves in situ free radical polymerization of a resin consisting of an acrylate-based crosslinker and a palladium metal precursor.
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Affiliation(s)
- Mohammad S. M. Saifullah
- Institute of Materials Research and Engineering
- A*STAR (Agency for Science, Technology and Research)
- Singapore 138634
- Republic of Singapore
| | - Ramakrishnan Ganesan
- Department of Chemistry
- Birla Institute of Technology & Science
- Hyderabad-500 078
- India
| | - Su Hui Lim
- Institute of Materials Research and Engineering
- A*STAR (Agency for Science, Technology and Research)
- Singapore 138634
- Republic of Singapore
- Department of Electrical and Computer Engineering
| | - Hazrat Hussain
- Department of Chemistry
- Quaid-i-Azam University
- Islamabad 45320
- Pakistan
| | - Hong Yee Low
- Engineering Product Development
- Singapore University of Technology & Design
- Singapore 487372
- Republic of Singapore
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19
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Qu J, Hou X, Fan W, Xi G, Diao H, Liu X. Scalable lithography from Natural DNA Patterns via polyacrylamide gel. Sci Rep 2015; 5:17872. [PMID: 26639572 PMCID: PMC4671135 DOI: 10.1038/srep17872] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2015] [Accepted: 11/05/2015] [Indexed: 11/16/2022] Open
Abstract
A facile strategy for fabricating scalable stamps has been developed using cross-linked polyacrylamide gel (PAMG) that controllably and precisely shrinks and swells with water content. Aligned patterns of natural DNA molecules were prepared by evaporative self-assembly on a PMMA substrate, and were transferred to unsaturated polyester resin (UPR) to form a negative replica. The negative was used to pattern the linear structures onto the surface of water-swollen PAMG, and the pattern sizes on the PAMG stamp were customized by adjusting the water content of the PAMG. As a result, consistent reproduction of DNA patterns could be achieved with feature sizes that can be controlled over the range of 40%–200% of the original pattern dimensions. This methodology is novel and may pave a new avenue for manufacturing stamp-based functional nanostructures in a simple and cost-effective manner on a large scale.
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Affiliation(s)
- JieHao Qu
- State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, The First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang, 310003, China.,Key Laboratory of Advanced Textile Materials and Manufacturing Technology, Ministry of Education, College of Materials and Textile, Zhejiang Sci-Tech University, Hangzhou 310018, P.R. China
| | - XianLiang Hou
- State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, The First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang, 310003, China
| | - WanChao Fan
- Key Laboratory of Advanced Textile Materials and Manufacturing Technology, Ministry of Education, College of Materials and Textile, Zhejiang Sci-Tech University, Hangzhou 310018, P.R. China
| | - GuangHui Xi
- Key Laboratory of Advanced Textile Materials and Manufacturing Technology, Ministry of Education, College of Materials and Textile, Zhejiang Sci-Tech University, Hangzhou 310018, P.R. China
| | - HongYan Diao
- State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, The First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang, 310003, China
| | - XiangDon Liu
- Key Laboratory of Advanced Textile Materials and Manufacturing Technology, Ministry of Education, College of Materials and Textile, Zhejiang Sci-Tech University, Hangzhou 310018, P.R. China
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20
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Chen A, Ostrom C. Palladium-Based Nanomaterials: Synthesis and Electrochemical Applications. Chem Rev 2015; 115:11999-2044. [DOI: 10.1021/acs.chemrev.5b00324] [Citation(s) in RCA: 533] [Impact Index Per Article: 59.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Aicheng Chen
- Department of Chemistry, Lakehead University, 955 Oliver Road, Thunder Bay, Ontario P7B 5E1, Canada
| | - Cassandra Ostrom
- Department of Chemistry, Lakehead University, 955 Oliver Road, Thunder Bay, Ontario P7B 5E1, Canada
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21
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Minamimoto H, Irie H, Uematsu T, Tsuda T, Imanishi A, Seki S, Kuwabata S. Polymerization of room-temperature ionic liquid monomers by electron beam irradiation with the aim of fabricating three-dimensional micropolymer/nanopolymer structures. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:4281-4289. [PMID: 25322348 DOI: 10.1021/la503252p] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
A novel method for fabricating microsized and nanosized polymer structures from a room-temperature ionic liquid (RTIL) on a Si substrate was developed by the patterned irradiation of an electron beam (EB). An extremely low vapor pressure of the RTIL, 1-allyl-3-ethylimidazolium bis((trifluoromethane)sulfonyl)amide, allows it to be introduced into the high-vacuum chamber of an electron beam apparatus to conduct a radiation-induced polymerization in the nanoregion. We prepared various three-dimensional (3D) micro/nanopolymer structures having high aspect ratios of up to 5 with a resolution of sub-100 nm. In addition, the effects of the irradiation dose and beam current on the physicochemical properties of the deposited polymers were investigated by recording the FT-IR spectra and Young's modulus. Interestingly, the overall shapes of the obtained structures were different from those prepared in our recent study using a focused ion beam (FIB) even if the samples were irradiated in a similar manner. This may be due to the different transmission between the two types of beams as discussed on the basis of the theoretical calculations of the quantum beam trajectories. Perceptions obtained in this study provide facile preparation procedures for the micro/nanostructures.
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Affiliation(s)
| | | | | | | | - A Imanishi
- §Department of Chemistry, Graduate School of Engineering Science, Osaka University, 1-3 Machikaneyama, Toyonaka, Osaka 560-8531, Japan
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22
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Minamimoto H, Irie H, Uematsu T, Tsuda T, Imanishi A, Seki S, Kuwabata S. Fine Patterning of Silver Metal by Electron Beam Irradiation onto Room-temperature Ionic Liquid. CHEM LETT 2015. [DOI: 10.1246/cl.141037] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Hiro Minamimoto
- Department of Applied Chemistry, Graduate School of Engineering, Osaka University
| | - Haruyasu Irie
- Department of Applied Chemistry, Graduate School of Engineering, Osaka University
| | - Taro Uematsu
- Department of Applied Chemistry, Graduate School of Engineering, Osaka University
- Frontier Research Base for Global Young Researchers, Graduate School of Engineering, Osaka University
| | - Tetsuya Tsuda
- Department of Applied Chemistry, Graduate School of Engineering, Osaka University
| | - Akihito Imanishi
- Department of Chemistry, Graduate School of Engineering Science, Osaka University
| | - Shu Seki
- Department of Applied Chemistry, Graduate School of Engineering, Osaka University
| | - Susumu Kuwabata
- Department of Applied Chemistry, Graduate School of Engineering, Osaka University
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23
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Ho D, Zou J, Zdyrko B, Iyer KS, Luzinov I. Capillary force lithography: the versatility of this facile approach in developing nanoscale applications. NANOSCALE 2015; 7:401-414. [PMID: 25331773 DOI: 10.1039/c4nr03565h] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Since its inception as a simple, low cost alternative to more complicated lithographic techniques such as electron-beam and dip-pen lithography, capillary force lithography (CFL) has developed into a versatile tool to form sub-100 nm patterns. Utilizing the concept of a polymer melt, structures and devices generated by the technique have been used in applications varying from surfaces regulating cell growth to gas sensing. In this review, we discuss various CFL methodologies which have evolved, their application in both biological and non-biological research, and finally a brief outlook in areas of research where CFL is destined to make an enormous impact in the near future.
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Affiliation(s)
- Dominic Ho
- School of Chemistry and Biochemistry, The University of Western Australia, Crawley, WA 6009, Perth, Australia.
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25
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Kurra N, Kiruthika S, Kulkarni GU. Solution processed sun baked electrode material for flexible supercapacitors. RSC Adv 2014. [DOI: 10.1039/c4ra02934h] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Pd hexadecylthiolate decomposes under sunlight leading to a conducting nanocrystalline Pd–carbon composite. Thus formed films serve as supercapacitor electrodes. The organic precursor enables the fabrication of micro-supercapacitors using e-beam lithography.
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Affiliation(s)
- Narendra Kurra
- Chemistry & Physics of Materials Unit and Thematic Unit of Excellence on Nanochemistry
- Jawaharlal Nehru Centre for Advanced Scientific Research
- Bangalore 560 064, India
| | - S. Kiruthika
- Chemistry & Physics of Materials Unit and Thematic Unit of Excellence on Nanochemistry
- Jawaharlal Nehru Centre for Advanced Scientific Research
- Bangalore 560 064, India
| | - Giridhar U. Kulkarni
- Chemistry & Physics of Materials Unit and Thematic Unit of Excellence on Nanochemistry
- Jawaharlal Nehru Centre for Advanced Scientific Research
- Bangalore 560 064, India
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26
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Wang YN, Wei WT, Yang CW, Huang MH. Seed-mediated growth of ultralong gold nanorods and nanowires with a wide range of length tunability. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:10491-10497. [PMID: 23924308 DOI: 10.1021/la400985n] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
This study reports a systematic approach to synthesize ultralong gold nanorods and nanowires using a seed-mediated growth approach. In the first series, the effect of growth solution pH on the lengths of nanorods prepared was investigated. Interestingly, although shorter rods (230-310 nm) were produced in a basic solution environment than in an acidic condition (330-410 nm), the nanorod yield is greatly improved with relatively few nanoplate byproducts formed. Nanorod growth proceeds quickly in a basic solution as evidenced by the fast solution color changes. By adjusting several experimental parameters with the aim to elongate the nanorod length in a tunable fashion, gold nanorods and nanowires with average lengths from 580 to 2850 nm can be synthesized by progressively increasing the HNO3 concentration in the final growth solution. Nanowire growth in a highly acidic solution is slower, and a substantially longer time is needed to reach long lengths. Further extension of the nanowire length can be achieved simply by reducing the volume of second growth solution transferred to the final growth solution. Nanorods and nanowires with lengths spanning from 700 nm to 4.5 μm were prepared in this series of experimental conditions. The longest nanowires can reach a length of up to 6 μm. The nanowires still maintain thin average diameters of 33-53 nm. The ability to make gold nanorods and nanowires over this exceptionally wide and useful length range is exciting because applications and demonstrations using ultralong gold nanorods and nanowires of most suitable lengths are now possible.
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Affiliation(s)
- Yu-Ning Wang
- Department of Chemistry, National Tsing Hua University, Hsinchu 30013, Taiwan
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27
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Radha B, Liu G, Eichelsdoerfer DJ, Kulkarni GU, Mirkin CA. Layer-by-layer assembly of a metallomesogen by dip-pen nanolithography. ACS NANO 2013; 7:2602-2609. [PMID: 23402390 DOI: 10.1021/nn306013e] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Palladium alkanethiolates are introduced here as a novel liquid ink for dip-pen nanolithography (DPN). These structures exhibit the unusual characteristic of layer-by-layer assembly, allowing one to deposit a desired number of metal ions on a surface, which can subsequently be reduced via thermolysis to form active catalytic structures. Such structures have been used to generate contiguous metallic or conducting polymer nanoscale architectures by electroless deposition.
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Affiliation(s)
- Boya Radha
- Department of Materials Science and Engineering, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, United States
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28
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Radha B, Lim SH, Saifullah MSM, Kulkarni GU. Metal hierarchical patterning by direct nanoimprint lithography. Sci Rep 2013; 3:1078. [PMID: 23446801 PMCID: PMC3584315 DOI: 10.1038/srep01078] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2012] [Accepted: 11/29/2012] [Indexed: 11/09/2022] Open
Abstract
Three-dimensional hierarchical patterning of metals is of paramount importance in diverse fields involving photonics, controlling surface wettability and wearable electronics. Conventionally, this type of structuring is tedious and usually involves layer-by-layer lithographic patterning. Here, we describe a simple process of direct nanoimprint lithography using palladium benzylthiolate, a versatile metal-organic ink, which not only leads to the formation of hierarchical patterns but also is amenable to layer-by-layer stacking of the metal over large areas. The key to achieving such multi-faceted patterning is hysteretic melting of ink, enabling its shaping. It undergoes transformation to metallic palladium under gentle thermal conditions without affecting the integrity of the hierarchical patterns on micro- as well as nanoscale. A metallic rice leaf structure showing anisotropic wetting behavior and woodpile-like structures were thus fabricated. Furthermore, this method is extendable for transferring imprinted structures to a flexible substrate to make them robust enough to sustain numerous bending cycles.
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Affiliation(s)
- Boya Radha
- Chemistry and Physics of Materials Unit and DST Unit on Nanoscience, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P.O., Bangalore 560 064, India
- Institute of Materials Research and Engineering, A*STAR (Agency for Science, Technology and Research), 3 Research Link, Singapore 117602, Republic of Singapore
| | - Su Hui Lim
- Institute of Materials Research and Engineering, A*STAR (Agency for Science, Technology and Research), 3 Research Link, Singapore 117602, Republic of Singapore
- Department of Electrical and Computer Engineering, National University of Singapore, 4 Engineering Drive 3, Singapore 117576, Republic of Singapore
| | - Mohammad S. M. Saifullah
- Institute of Materials Research and Engineering, A*STAR (Agency for Science, Technology and Research), 3 Research Link, Singapore 117602, Republic of Singapore
| | - Giridhar U. Kulkarni
- Chemistry and Physics of Materials Unit and DST Unit on Nanoscience, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P.O., Bangalore 560 064, India
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29
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Battistel D, Daniele S, Fratter D. A scanning electrochemical microscopy procedure for micropatterning Al2O3-thin films deposited on a platinum substrate. Electrochim Acta 2012. [DOI: 10.1016/j.electacta.2012.06.066] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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30
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El Mel AA, Gautron E, Angleraud B, Granier A, Xu W, Choi CH, Briston KJ, Inkson BJ, Tessier PY. Fabrication of a nickel nanowire mesh electrode suspended on polymer substrate. NANOTECHNOLOGY 2012; 23:275603. [PMID: 22706790 DOI: 10.1088/0957-4484/23/27/275603] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
We report on an efficient strategy for the fabrication of an ultra-long suspended nanowire mesh suitable for nanodevice architectures on a polymer surface. First, nickel nanowires are synthesized directly on a template substrate by magnetron sputtering. Laser interference lithography followed by deep reactive ion etching is used to create the nanograted template substrate constituted of one-dimensional line pattern arrays of 240 nm in periodicity. Ordered alignment of ultra-long nanowires (∼180 nm in diameter) with high fidelity to the template pattern is observed by scanning electron microscopy. The transfer of the pre-defined parallel nanowire array from the template surface to a target polymer substrate for electrical characterization of the system is demonstrated. The electrical behaviour of the nanowire mesh, suspended between two electrodes, was found to be linear, stable, and reproducible. This result suggests that this nanofabrication process will open an efficient way to the design and construction of novel nanodevices.
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Affiliation(s)
- A A El Mel
- Université de Nantes, CNRS, Institut des Matériaux Jean Rouxel, UMR 6502, 2 rue de la Houssinière BP 32229-44322 Nantes cedex 3, France
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31
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Kwon G, Chu H, Yoo J, Kim H, Han C, Chung C, Lee J, Lee H. Fabrication of uniform and high resolution copper nanowire using intermediate self-assembled monolayers through direct AFM lithography. NANOTECHNOLOGY 2012; 23:185307. [PMID: 22513508 DOI: 10.1088/0957-4484/23/18/185307] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Electrochemical AFM lithography was used to directly fabricate copper nanowires. The copper ions were strongly reduced by a negative sample bias at the point where the AFM tip was localized, and copper metal wires were successfully fabricated following the direction of the electrical field of the bias. A TDA⋅HCl self-assembled monolayer (SAM) was found to play an important role as an intermediate layer for enhancing the capability of high resolution and complete development after the AFM lithographic process. The physical and electrical properties of the wires were analyzed by AFM, EFM, SEM, TEM and I-V measurement. The fabricated copper has promising potential for applications such as masks and interconnectors for nanoelectronic devices.
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Affiliation(s)
- G Kwon
- Department of Nanotechnology, Hanyang University, Seoul 133-791, Korea.
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BHUVANA T, KULKARNI GU. ULTRAFINE ZnO NANOWIRES GROWN ON PATTERNABLE Pd CATALYST AND THEIR SOURCE-ENERGY DEPENDENT PHOTOLUMINESCENCE. INTERNATIONAL JOURNAL OF NANOSCIENCE 2012. [DOI: 10.1142/s0219581x11008939] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Patterned arrays of ZnO nanostructures have been obtained from a solution based method using Pd nanoparticles as catalyst. The catalyst nanoparticles were patterned using a direct-write e-beam lithography process. Within 10 minutes in an aqueous solution of zinc nitrate and triethyamine borane at 80°C, fine nanowires of ZnO with diameter around 10 nm were produced on patterned Pd nanoparticles. Longer duration in the precursor solution led to formation of ZnO fibril-like structures. Photoluminescence measurements revealed that the nanostructures exhibited a blue shift for the emission peak at 390 nm, when the excitation energy was increased, unlike bulk ZnO . This is attributed to the discrete defect states present in confined nanostructures.
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Affiliation(s)
- T. BHUVANA
- Chemistry and Physics of Materials Unit and DST Unit on Nanoscience, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P.O., Bangalore 560 064, India
| | - G. U. KULKARNI
- Chemistry and Physics of Materials Unit and DST Unit on Nanoscience, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P.O., Bangalore 560 064, India
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Li G, Shang M, Geng D, Yang D, Peng C, Cheng Z, Lin J. Multiform La2O3: Yb3+/Er3+/Tm3+ submicro-/microcrystals derived by hydrothermal process: Morphology control and tunable upconversion luminescence properties. CrystEngComm 2012. [DOI: 10.1039/c2ce06248h] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Zou J, Zdyrko B, Luzinov I, Raston CL, Swaminathan Iyer K. Regiospecific linear assembly of Pd nanocubes for hydrogen gas sensing. Chem Commun (Camb) 2012; 48:1033-5. [DOI: 10.1039/c1cc15522a] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Shi S, Lu N, Lu Y, Wang Y, Qi D, Xu H, Chi L. Fabrication of periodic metal nanowires with microscale mold by nanoimprint lithography. ACS APPLIED MATERIALS & INTERFACES 2011; 3:4174-4179. [PMID: 21978230 DOI: 10.1021/am2010338] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
In this paper, a simple method is demonstrated for fabricating periodic metal nanowires based on the unconventional nanoimprint lithography (NIL) technique. Using this method, sub-100 nm metal nanowires with the rectangular cross-section are fabricated with microscale stamp. Furthermore, the metal nanowires with different widths and heights can be generated by adjusting the imprinting parameters with the same stamp. The metal nanowires prepared with this method can be used for chemical sensing, such as ammonia sensing, and it may have applications in optical signal processing.
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Chen YP, Zhao Y, Qiu KQ, Chu J, Yu HQ, Liu G, Tian YC, Xiong Y. Fabrication of dendritic silver nanostructure using an integration of holographic lithography and electrochemical deposition. Electrochim Acta 2011. [DOI: 10.1016/j.electacta.2011.06.087] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Radha B, Kiruthika S, Kulkarni GU. Metal Anion–Alkyl Ammonium Complexes as Direct Write Precursors to Produce Nanopatterns of Metals, Nitrides, Oxides, Sulfides, And Alloys. J Am Chem Soc 2011; 133:12706-13. [DOI: 10.1021/ja2039612] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- B. Radha
- Chemistry and Physics of Materials Unit and DST Unit on Nanoscience, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P.O., Bangalore 560064, India
| | - S. Kiruthika
- Chemistry and Physics of Materials Unit and DST Unit on Nanoscience, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P.O., Bangalore 560064, India
| | - G. U. Kulkarni
- Chemistry and Physics of Materials Unit and DST Unit on Nanoscience, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P.O., Bangalore 560064, India
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38
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Radha B, Sagade AA, Kulkarni GU. Flexible and semitransparent strain sensors based on micromolded Pd nanoparticle-carbon μ-stripes. ACS APPLIED MATERIALS & INTERFACES 2011; 3:2173-8. [PMID: 21678984 DOI: 10.1021/am2002873] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
Flexible resistive strain sensors have been fabricated by micromolding Pd alkanethiolate on polyimide substrates and subjecting to thermolysis in air. Thus produced stripes were ∼1 μm wide with spacing of ∼0.5 μm and contained Pd nanoparticles in carbon matrix. The nanoparticle size and the nature of carbon are much dependent on the thermolysis temperature as is also the resistance of the microstripes. Generally, lower thermolysis temperatures (<230 °C) produced stripes containing small Pd nanoparticles with significant fraction of carbon from the precursor decomposition. The stripes were poorly conducting yet interestingly, exhibited change of resistance under tensile and compressive strain. Particularly noteworthy are the stripes produced from 195 °C thermolysis, which showed a high gauge factor of ∼390 with strain sensitivity, 0.09%. With molding at 230 °C, the stripes obtained were highly conducting, and amazingly did not change the resistance with strain even after several bending cycles. The latter are ideal as flexible conduits and interconnects. Thus, the article reports a method of producing flexible sensitive strain sensors on one hand and on the other, flexible conduits with unchanging resistance, merely by fine-tuning the precursor decomposition under the molding conditions.
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Affiliation(s)
- B Radha
- Chemistry and Physics of Materials Unit and DST Unit on Nanoscience, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P.O., Bangalore 560064, India
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Noh JS, Kim H, Kim BS, Lee E, Cho HH, Lee W. High-performance vertical hydrogen sensors using Pd-coated rough Si nanowires. ACTA ACUST UNITED AC 2011. [DOI: 10.1039/c1jm12701b] [Citation(s) in RCA: 62] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Abstract
Metal nanowire patterning in the form of grating structures has been carried out using a wide range of lithography techniques, and many hybrid methods derived from them. The challenge is to achieve sub-100 nm linewidths with controllable spacing and thickness over large areas of substrates with high throughput. In particular, the patterns with linewidth and spacing of a few tens of nm offer properties of great interest in optoelectronics and plasmonics. Crossbar grating structures--two gratings patterned perpendicular to each other--will play an important role as ultra-high density electrode grids in memristive devices for non-volatile memory.
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Affiliation(s)
- G U Kulkarni
- Chemistry and Physics of Materials Unit and DST Unit on Nanoscience,Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur PO, Bangalore 560064, India.
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41
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Heun S, Radha B, Ercolani D, Kulkarni GU, Rossi F, Grillo V, Salviati G, Beltram F, Sorba L. Coexistence of vapor-liquid-solid and vapor-solid-solid growth modes in Pd-assisted InAs nanowires. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2010; 6:1935-1941. [PMID: 20662001 DOI: 10.1002/smll.201000811] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
During the growth of InAs nanowires from Pd catalyst particles on InAs(111)A substrates, two distinct classes of nanowires are observed with smooth or zigzagged sidewalls. It is shown that this is related to a bimodal distribution of the wire-tip diameter: above a critical diameter wires grow with smooth sidewalls, and below with zigzagged morphology. Transmission electron microscopy analysis shows that the catalyst particles at the tip of zigzagged wires are smooth and have a higher aspect ratio than those at the tip of smooth wires. Zigzagged wires grow from liquid particles in the vapor-liquid-solid (VLS) mode whereas the smooth ones grow from solid particles in the vapor-solid-solid (VSS) mode.
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Affiliation(s)
- Stefan Heun
- NEST, Istituto Nanoscienze-CNR and Scuola Normale Superiore, Piazza S Silvestro 12, 56127 Pisa, Italy.
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Critchley K, Khanal BP, Górzny MŁ, Vigderman L, Evans SD, Zubarev ER, Kotov NA. Near-bulk conductivity of gold nanowires as nanoscale interconnects and the role of atomically smooth interface. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2010; 22:2338-2342. [PMID: 20376858 DOI: 10.1002/adma.201000236] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Affiliation(s)
- Kevin Critchley
- Department of Chemical Engineering, University of Michigan, Ann Arbor, 48109, USA
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Bhuvana T, Smith KC, Fisher TS, Kulkarni GU. Self-assembled CNT circuits with ohmic contacts using Pd hexadecanethiolate as in situ solder. NANOSCALE 2009; 1:271-275. [PMID: 20644849 DOI: 10.1039/b9nr00035f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
An easy and elegant method of CNT nanocircuit fabrication using a metal organic precursor of Pd, namely, Pd hexadecanethiolate, is presented. This precursor directs the self-assembly of individual CNTs spanning a gap between Au electrodes. This is achieved by first patterning the precursor along the edges of the gap electrodes, as it enables direct patterning by e beam. Further, thermal activation of the precursor at 250 degrees C leads to metallization and the ohmic electrical contact between the CNTs and the electrodes beneath. A resistive fuse action of the soldered CNTs is observed as well.
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Affiliation(s)
- Thiruvelu Bhuvana
- Chemistry and Physics of Materials Unit and DST Unit on Nanoscience, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P O, Bangalore, 560 064, India
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Radha B, Kulkarni GU. A modified micromolding method for sub-100-nm direct patterning of Pd nanowires. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2009; 5:2271-2275. [PMID: 19582731 DOI: 10.1002/smll.200900768] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Affiliation(s)
- Boya Radha
- Chemistry and Physics of Materials Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P.O., Bangalore 560 064, India
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45
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Botman A, Mulders JJL, Hagen CW. Creating pure nanostructures from electron-beam-induced deposition using purification techniques: a technology perspective. NANOTECHNOLOGY 2009; 20:372001. [PMID: 19706953 DOI: 10.1088/0957-4484/20/37/372001] [Citation(s) in RCA: 157] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
The creation of functional nanostructures by electron-beam-induced deposition (EBID) is becoming more widespread. The benefits of the technology include fast 'point-and-shoot' creation of three-dimensional nanostructures at predefined locations directly within a scanning electron microscope. One significant drawback to date has been the low purity level of the deposition. This has two independent causes: (1) partial or incomplete decomposition of the precursor molecule and (2) contamination from the residual chamber gas. This frequently limits the functionality of the structure, hence it is desirable to improve the decomposition and prevent the inclusion of contaminants. In this contribution we review and compare for the first time all the techniques specifically aimed at purifying the as-deposited impure EBID structures. Despite incomplete and scattered data, we observe some general trends: application of heat (during or after deposition) is usually beneficial to some extent; working in a favorable residual gas (ultra-high vacuum set-ups or plasma cleaning the chamber) is highly recommended; gas mixing approaches are extremely variable and not always reproducible between research groups; and carbon-free precursors are promising but tend to result in oxygen being the contaminant species rather than carbon. Finally we highlight a few novel approaches.
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Affiliation(s)
- A Botman
- Faculty of Applied Sciences, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands.
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Radha B, Kulkarni GU. Dewetting assisted patterning of polystyrene by soft lithography to create nanotrenches for nanomaterial deposition. ACS APPLIED MATERIALS & INTERFACES 2009; 1:257-260. [PMID: 20353211 DOI: 10.1021/am800172f] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Micromolding in capillaries of polystyrene has been carried out using a poly(dimethylsiloxane) stamp, derived from a compact disk (CD) as master, while heating above the glass transition temperature of polystyrene. The resulting pattern contained a replica of the parallel channels but with an important difference that trenches of width approximately 30 nm were found in between. The nanotrenches in polystyrene could be filled with metals by physical vapor deposition and electroless plating. This method finds potential applications in nanoelectronics and nanofluidics.
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Bhuvana T, Gregoratti L, Heun S, Dalmiglio M, Kulkarni GU. Electron resist behavior of Pd hexadecanethiolate examined using X-ray photoelectron spectroscopy with nanometric lateral resolution. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2009; 25:1259-1264. [PMID: 19093756 DOI: 10.1021/la803344f] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Electron resist behavior of Pd hexadecanethiolate is studied by varying the e-dosage from 2-280 muC.cm(-2). The e-beam exposed resist is characterized using energy dispersive spectroscopy, infrared spectroscopy, and X-ray photoelectron spectroscopy with nanometric lateral resolution. Electron beam exposure causes defects in the alkyl chain of the thiolate, giving the required solubility contrast during the developing step, thus qualifying the precursor as an e-beam resist. On exposure to the e-beam, the reduction of Pd(2+) to Pd(0) is observed, and the reduction increases with increasing e-dosage. The resist is highly sensitive, with the estimated sensitivity being 32 muC.cm(-2). Thermolysis at 250 degrees C leads to the formation of Pd nanoparticles, demonstrating the essential feature of a direct write resist for conducting patterns.
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Affiliation(s)
- T Bhuvana
- Chemistry and Physics of Materials Unit and DST Unit on Nanoscience, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P O, Bangalore 560 064, India
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Trudel S, Hill RH. Top-down meets bottom-up — Electron-beam induced metalorganic deposition of amorphous iron oxide nanostructures. CAN J CHEM 2009. [DOI: 10.1139/v08-124] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
We present the use of a metalorganic precursor, iron(III) 2-ethylhexanoate, as a precursor for the electron-beam induced deposition of amorphous iron oxide nanostructures. Exposing this precursor to an area dose of 1.560 mC/cm2 with 10 keV electrons affords a material that can be developed and was determined to be amorphous iron oxide when examined by TEM, electron diffraction, and energy dispersive X-ray spectroscopy. Single point exposure yields free-standing hollow nanorods with diameters from 85 to 255 nm controlled by the exposure dose. The patterning of sub 40 nm nanowires with low (<3 nm) line edge and width roughnesses is also presented.Key words: electron beam lithography, amorphous iron oxide, nanotubes, nanowires, coordination polymer precursor.
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50
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Xiang C, Kung SC, Taggart DK, Yang F, Thompson MA, Güell AG, Yang Y, Penner RM. Lithographically patterned nanowire electrodeposition: a method for patterning electrically continuous metal nanowires on dielectrics. ACS NANO 2008; 2:1939-1949. [PMID: 19206435 DOI: 10.1021/nn800394k] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Lithographically patterned nanowire electrodeposition (LPNE) is a new method for fabricating polycrystalline metal nanowires using electrodeposition. In LPNE, a sacrificial metal (M(1)=silver or nickel) layer, 5-100 nm in thickness, is first vapor deposited onto a glass, oxidized silicon, or Kapton polymer film. A (+) photoresist (PR) layer is then deposited, photopatterned, and the exposed Ag or Ni is removed by wet etching. The etching duration is adjusted to produce an undercut approximately 300 nm in width at the edges of the exposed PR. This undercut produces a horizontal trench with a precisely defined height equal to the thickness of the M(1) layer. Within this trench, a nanowire of metal M(2) is electrodeposited (M(2)=gold, platinum, palladium, or bismuth). Finally the PR layer and M(1) layer are removed. The nanowire height and width can be independently controlled down to minimum dimensions of 5 nm (h) and 11 nm (w), for example, in the case of platinum. These nanowires can be 1 cm in total length. We measure the temperature-dependent resistance of 100 microm sections of Au and Pd wires in order to estimate an electrical grain size for comparison with measurements by X-ray diffraction and transmission electron microscopy. Nanowire arrays can be postpatterned to produce two-dimensional arrays of nanorods. Nanowire patterns can also be overlaid one on top of another by repeating the LPNE process twice in succession to produce, for example, arrays of low-impedance, nanowire-nanowire junctions.
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Affiliation(s)
- Chenxiang Xiang
- Department of Chemistry, University of California, Irvine, California 92697-2025, USA
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