1
|
Douglas SP, Faria EN, Mrig S, Zhou Y, Santoni L, Clancy AJ, Knapp CE. Tris(β-ketoiminate) Aluminium(III) Compounds as Aluminium Oxide Precursors. Chempluschem 2023; 88:e202200411. [PMID: 36646521 DOI: 10.1002/cplu.202200411] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2022] [Revised: 12/22/2022] [Indexed: 12/24/2022]
Abstract
Precursor design is the crucial step in tailoring the deposition profile towards a multitude of functional materials. Most commercially available aluminium oxide precursors require high processing temperatures (>500 °C). Herein, we report the tuning of the decomposition profile (200-350 °C) of a range of octahedrally coordinated tris(β-ketoiminate) aluminium complexes of the type [Al(MeCN(R)CHC=OMe)3 ], by varying the R substituents in the ligands. The complexes are derived from the reaction of trimethylamine alane (TMAA) and a series of N-substituted β-ketoiminate ligands (R-acnacH, R=Me, Et, i Pr, Ph) with varying R-substituents sizes. When the more sterically encumbered ligand (R=Mes) was used, the Al atom became five-coordinate, therefore representing the threshold to octahedral coordination around the metal in these type of compounds, which, consequently, lead to a change of decomposition profile. The resulting compounds have been characterised by NMR spectroscopy, mass spectrometry, elemental analysis and single crystal X-ray diffraction. [Al(MeCN(Me)CHC=OMe)3 ] has been used as a single source precursor for the deposition of Al2 O3 . Thin films were deposited via aerosol assisted chemical vapour deposition (AACVD), with toluene as the solvent, and were analysed using SEM, EDX and XPS.
Collapse
Affiliation(s)
- Samuel P Douglas
- Department of Chemistry, University College London, 20 Gordon Street, WC1H 0AJ, London, UK
| | - Erica N Faria
- Department of Chemistry, University College London, 20 Gordon Street, WC1H 0AJ, London, UK
| | - Shreya Mrig
- Department of Chemistry, University College London, 20 Gordon Street, WC1H 0AJ, London, UK
| | - Ye Zhou
- Department of Chemistry, University College London, 20 Gordon Street, WC1H 0AJ, London, UK
| | - Leonardo Santoni
- Department of Chemistry, University College London, 20 Gordon Street, WC1H 0AJ, London, UK
| | - Adam J Clancy
- Department of Chemistry, University College London, 20 Gordon Street, WC1H 0AJ, London, UK
| | - Caroline E Knapp
- Department of Chemistry, University College London, 20 Gordon Street, WC1H 0AJ, London, UK
| |
Collapse
|
2
|
Al Hareri M, Emslie DJH. Synthesis, Structures, and Thermal Stability of Dialkyl and Bis(amido) Zirconium(IV) Acen Complexes. Eur J Inorg Chem 2022. [DOI: 10.1002/ejic.202200594] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Affiliation(s)
- Majeda Al Hareri
- Department of Chemistry McMaster University 1280 Main St West Hamilton ON L8S 4M1 Canada
| | - David J. H. Emslie
- Department of Chemistry McMaster University 1280 Main St West Hamilton ON L8S 4M1 Canada
| |
Collapse
|
3
|
Mears KL, Bhide MA, Knapp CE, Carmalt CJ. Investigations into the structure, reactivity, and AACVD of aluminium and gallium amidoenoate complexes. Dalton Trans 2021; 51:156-167. [PMID: 34870650 DOI: 10.1039/d1dt03365d] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Amidoenoate (AME = {ethyl-3-(R-amido)but-2-enoate}) complexes of aluminium and gallium, of the type: [AlCl2(AMER)] R = iPr (1-Al); [AlCl(AMER)2] R = iPr (2-Al), Dip (3-Al); [GaCl2(AMER)] R = iPr (1-Ga) and [GaCl(AMER)2] R = iPr (2-Ga), Dip (3-Ga), have been synthesised (iPr = isopropyl, Dip = 2,6-diisopropylphenyl). The coordination chemistry of these complexes has been studied in relation to precursor suitability. Investigations into the reactivity of the aluminium and gallium amidoenoate complexes involved reactions with hydride sources including alkali metal hydride salts, alkylsilanes, and magnesium hydride species and magnesium(I) dimers. The isolation of alkyl metal amidoenoate precursors including an aluminium hydride amidoenoate, [AlH(AMEDip)2] (4-Al) and dimethyl gallium amidoenoates [GaMe2(AMEDip)] (4-Ga), [GaMe2(AMEiPr)] (5-Ga) concluded the synthetic studies. A selection of the isolated complexes were used as precursors for aerosol assisted chemical vapour deposition (AACVD) at 500 °C. Thin films of either amorphous Al2O3 or Ga2O3 were deposited and subsequently annealed at 1000 °C to improve the materials' crystallinity. The films were characterised by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), UV-visible (UV-vis) spectroscopy and energy dispersive X-ray analysis (EDXA).
Collapse
Affiliation(s)
- Kristian L Mears
- Department of Chemistry, University College London, 20 Gordon Street, London, WC1H 0AJ, UK.
| | - Malavika A Bhide
- Department of Chemistry, University College London, 20 Gordon Street, London, WC1H 0AJ, UK.
| | - Caroline E Knapp
- Department of Chemistry, University College London, 20 Gordon Street, London, WC1H 0AJ, UK.
| | - Claire J Carmalt
- Department of Chemistry, University College London, 20 Gordon Street, London, WC1H 0AJ, UK.
| |
Collapse
|
4
|
Roy MMD, Omaña AA, Wilson ASS, Hill MS, Aldridge S, Rivard E. Molecular Main Group Metal Hydrides. Chem Rev 2021; 121:12784-12965. [PMID: 34450005 DOI: 10.1021/acs.chemrev.1c00278] [Citation(s) in RCA: 122] [Impact Index Per Article: 40.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
This review serves to document advances in the synthesis, versatile bonding, and reactivity of molecular main group metal hydrides within Groups 1, 2, and 12-16. Particular attention will be given to the emerging use of said hydrides in the rapidly expanding field of Main Group element-mediated catalysis. While this review is comprehensive in nature, focus will be given to research appearing in the open literature since 2001.
Collapse
Affiliation(s)
- Matthew M D Roy
- Inorganic Chemistry Laboratory, Department of Chemistry, University of Oxford, South Parks Road, Oxford OX1 3QR, United Kingdom
| | - Alvaro A Omaña
- Department of Chemistry, University of Alberta, 11227 Saskatchewan Drive, Edmonton, Alberta T6G 2G2, Canada
| | - Andrew S S Wilson
- Department of Chemistry, University of Bath, Avon BA2 7AY, United Kingdom
| | - Michael S Hill
- Department of Chemistry, University of Bath, Avon BA2 7AY, United Kingdom
| | - Simon Aldridge
- Inorganic Chemistry Laboratory, Department of Chemistry, University of Oxford, South Parks Road, Oxford OX1 3QR, United Kingdom
| | - Eric Rivard
- Department of Chemistry, University of Alberta, 11227 Saskatchewan Drive, Edmonton, Alberta T6G 2G2, Canada
| |
Collapse
|
5
|
Mears KL, Bloor LG, Pugh D, Aliev AE, Knapp CE, Carmalt CJ. Structural and Dynamic Properties of Gallium Alkoxides. Inorg Chem 2019; 58:10346-10356. [PMID: 31334640 PMCID: PMC7007204 DOI: 10.1021/acs.inorgchem.9b01496] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A comparison of chlorido-gallium functionalized alkoxides as precursors for aerosol-assisted chemical vapor deposition (AACVD) was carried out. Variable-temperature (VT)-NMR studies were used to probe the fluxional behavior of these alkoxides in solution, and hence their utility as precursors. The synthesis involved the initial isolation of the dimer [GaCl(NMe2)2]2 via a salt metathesis route from GaCl3 and 2 equiv of LiNMe2. This dimer was then reacted with 4 equiv of HOCH2CH2CH2NEt2, resulting in the formation of Ga[μ-(OCH2CH2CH2NEt2)2GaCl2]3 (1). Mass spectrometry and VT-NMR confirmed the oligomeric structure of 1. Tuning of the ligand properties, namely, the chain length and substituents on N, resulted in formation of the monomers [GaCl(OR)2] (R = CH2CH2NEt2, (2); CH2CH2CH2NMe2, (3)). VT-NMR studies, supported by density functional theory calculations, confirmed that the ligands in both 2 and 3 possess a hemilabile coordination to the gallium center, owing to either a shorter carbon backbone (2) or less steric hindrance (3). Both 2 and 3 were selected for use as precursors for AACVD: deposition at 450 °C gave thin films of amorphous Ga2O3, which were subsequently annealed at 1000 °C to afford crystalline Ga2O3 material. The films were fully characterized by X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy, UV-visible spectroscopy, and energy dispersive X-ray analysis.
Collapse
Affiliation(s)
- Kristian L Mears
- Materials Chemistry Centre, Department of Chemistry , University College London , 20 Gordon Street , London WC1H 0AJ , United Kingdom
| | - Leanne G Bloor
- Materials Chemistry Centre, Department of Chemistry , University College London , 20 Gordon Street , London WC1H 0AJ , United Kingdom
| | - David Pugh
- Molecular Sciences Research Hub , Imperial College London , 80 Wood Lane , London , W12 0BZ , United Kingdom
| | - Abil E Aliev
- Materials Chemistry Centre, Department of Chemistry , University College London , 20 Gordon Street , London WC1H 0AJ , United Kingdom
| | - Caroline E Knapp
- Materials Chemistry Centre, Department of Chemistry , University College London , 20 Gordon Street , London WC1H 0AJ , United Kingdom
| | - Claire J Carmalt
- Materials Chemistry Centre, Department of Chemistry , University College London , 20 Gordon Street , London WC1H 0AJ , United Kingdom
| |
Collapse
|
6
|
Steiniger P, Dittrich D, Scheiper C, John C, Wölper C, Schulz S. Synthesis and X-ray Crystal Structures of β-Ketoiminate Complexes. Z Anorg Allg Chem 2018. [DOI: 10.1002/zaac.201800321] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Phillip Steiniger
- Faculty of Chemistry and Center for Nanointegration Duisburg-Essen (CENIDE); University of Duisburg-Essen; 45117 Essen Germany
| | - Dennis Dittrich
- Faculty of Chemistry and Center for Nanointegration Duisburg-Essen (CENIDE); University of Duisburg-Essen; 45117 Essen Germany
| | - Christoph Scheiper
- Faculty of Chemistry and Center for Nanointegration Duisburg-Essen (CENIDE); University of Duisburg-Essen; 45117 Essen Germany
| | - Christoph John
- Faculty of Chemistry and Center for Nanointegration Duisburg-Essen (CENIDE); University of Duisburg-Essen; 45117 Essen Germany
| | - Christoph Wölper
- Faculty of Chemistry and Center for Nanointegration Duisburg-Essen (CENIDE); University of Duisburg-Essen; 45117 Essen Germany
| | - Stephan Schulz
- Faculty of Chemistry and Center for Nanointegration Duisburg-Essen (CENIDE); University of Duisburg-Essen; 45117 Essen Germany
| |
Collapse
|
7
|
|
8
|
Sadlo A, Beer SMJ, Rahman S, Grafen M, Rogalla D, Winter M, Ostendorf A, Devi A. Tailored β-Ketoiminato Complexes of Iron: Synthesis, Characterization, and Evaluation towards Solution-Based Deposition of Iron Oxide Thin Films. Eur J Inorg Chem 2018. [DOI: 10.1002/ejic.201800094] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Alexander Sadlo
- Inorganic Materials Chemistry; Ruhr University Bochum; Universitätsstrasse 150 44801 Bochum Germany
| | - Sebastian M. J. Beer
- Inorganic Materials Chemistry; Ruhr University Bochum; Universitätsstrasse 150 44801 Bochum Germany
| | - Shafiqur Rahman
- Inorganic Materials Chemistry; Ruhr University Bochum; Universitätsstrasse 150 44801 Bochum Germany
| | - Markus Grafen
- Applied Laser Technologies; Faculty of Mechanical Engineering; Ruhr University Bochum; Universitätsstrasse 150 44801 Bochum Germany
| | - Detlef Rogalla
- RUBION; Ruhr University Bochum; Universitätsstrasse 150 44801 Bochum Germany
| | - Manuela Winter
- Inorganic Materials Chemistry; Ruhr University Bochum; Universitätsstrasse 150 44801 Bochum Germany
| | - Andreas Ostendorf
- Applied Laser Technologies; Faculty of Mechanical Engineering; Ruhr University Bochum; Universitätsstrasse 150 44801 Bochum Germany
| | - Anjana Devi
- Inorganic Materials Chemistry; Ruhr University Bochum; Universitätsstrasse 150 44801 Bochum Germany
| |
Collapse
|
9
|
Metal β-diketoiminate precursor use in aerosol assisted chemical vapour deposition of gallium- and aluminium-doped zinc oxide. Polyhedron 2018. [DOI: 10.1016/j.poly.2017.10.036] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
|
10
|
O’Donoghue R, Rahman S, Mallick B, Winter M, Rogalla D, Becker HW, Devi A. Molecular engineering of Ga-ketoiminates: synthesis, structure and evaluation as precursors for the additive-free spin-coated deposition of gallium oxide thin films. NEW J CHEM 2018. [DOI: 10.1039/c7nj04334a] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
New gallium ketoiminate precursors with high solubility, favourable hydrolysis and decomposition route enabling additive free processing of Ga2O3 thin films.
Collapse
Affiliation(s)
- Richard O’Donoghue
- Inorganic Materials Chemistry
- Faculty of Chemistry and Biochemistry
- Ruhr-University Bochum
- 44801 Bochum
- Germany
| | - Shafiqur Rahman
- Inorganic Materials Chemistry
- Faculty of Chemistry and Biochemistry
- Ruhr-University Bochum
- 44801 Bochum
- Germany
| | - Bert Mallick
- Inorganic Materials Chemistry
- Faculty of Chemistry and Biochemistry
- Ruhr-University Bochum
- 44801 Bochum
- Germany
| | - Manuela Winter
- Inorganic Materials Chemistry
- Faculty of Chemistry and Biochemistry
- Ruhr-University Bochum
- 44801 Bochum
- Germany
| | | | | | - Anjana Devi
- Inorganic Materials Chemistry
- Faculty of Chemistry and Biochemistry
- Ruhr-University Bochum
- 44801 Bochum
- Germany
| |
Collapse
|
11
|
Johnson JA, Ashokan A, Chalana AK, Andrews AP, Venugopal A. Neutral and Cationic β-Ketoiminato Bismuth Complexes. Z Anorg Allg Chem 2017. [DOI: 10.1002/zaac.201700054] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Jobha A. Johnson
- School of Chemistry; Indian Institute of Science Education and Research Thiruvananthapuram; 695551 Vithura, Thiruvananthapuram India
| | - Arun Ashokan
- School of Chemistry; Indian Institute of Science Education and Research Thiruvananthapuram; 695551 Vithura, Thiruvananthapuram India
| | - Ashish K. Chalana
- School of Chemistry; Indian Institute of Science Education and Research Thiruvananthapuram; 695551 Vithura, Thiruvananthapuram India
| | - Alex P. Andrews
- School of Chemistry; Indian Institute of Science Education and Research Thiruvananthapuram; 695551 Vithura, Thiruvananthapuram India
| | - Ajay Venugopal
- School of Chemistry; Indian Institute of Science Education and Research Thiruvananthapuram; 695551 Vithura, Thiruvananthapuram India
| |
Collapse
|
12
|
Cosham SD, Hamilton JA, Hill MS, Johnson AL, Molloy KC. Synthesis, Structure and Chemical Vapour Deposition Studies on the Group 13 Complexes [Me
2
M{tfacnac}] [M = Al, Ga, In; Htfacnac = F
3
CC(OH)CHC(CH
3
)NCH
2
CH
2
OCH
3
]. Eur J Inorg Chem 2016. [DOI: 10.1002/ejic.201600023] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Samuel D. Cosham
- Department of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, UK, http://www.bath.ac.uk/chemistry/contacts/academics/andrew_johnson/
| | - Jeff A. Hamilton
- Department of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, UK, http://www.bath.ac.uk/chemistry/contacts/academics/andrew_johnson/
| | - Michael S. Hill
- Department of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, UK, http://www.bath.ac.uk/chemistry/contacts/academics/andrew_johnson/
| | - Andrew L. Johnson
- Department of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, UK, http://www.bath.ac.uk/chemistry/contacts/academics/andrew_johnson/
| | - Kieran C. Molloy
- Department of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, UK, http://www.bath.ac.uk/chemistry/contacts/academics/andrew_johnson/
| |
Collapse
|
13
|
Basiak D, Ochal Z, Justyniak I, Ziemkowska W. 1-(1,3-Benzothiazol-2-ylsulfanyl)propan-2-olate anion as a potential multifunctional ligand in aluminum complexes. Polyhedron 2015. [DOI: 10.1016/j.poly.2015.10.048] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
|
14
|
Abstract
This critical review focuses on the solution based chemical vapour deposition (CVD) of main group materials with particular emphasis on their current and potential applications. Deposition of thin films of main group materials, such as metal oxides, sulfides and arsenides, have been researched owing to the array of applications which utilise them including solar cells, transparent conducting oxides (TCOs) and window coatings. Solution based CVD processes, such as aerosol-assisted (AA)CVD have been developed due to their scalability and to overcome the requirement of suitably volatile precursors as the technique relies on the solubility rather than volatility of precursors which vastly extends the range of potentially applicable compounds. An introduction into the applications and precursor requirements of main group materials will be presented first followed by a detailed discussion of their deposition reviewed according to this application. The challenges and prospects for further enabling research in terms of emerging main group materials will be discussed.
Collapse
Affiliation(s)
- Caroline E Knapp
- Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, UK.
| | | |
Collapse
|
15
|
Manzi JA, Knapp CE, Parkin IP, Carmalt CJ. Aerosol-Assisted Chemical-Vapour Deposition of Zinc Oxide from Single-Source β-Iminoesterate Precursors. Eur J Inorg Chem 2015. [DOI: 10.1002/ejic.201500416] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
|
16
|
Knapp CE, Marchand P, Dyer C, Parkin IP, Carmalt CJ. Synthesis and characterisation of novel aluminium and gallium precursors for chemical vapour deposition. NEW J CHEM 2015. [DOI: 10.1039/c5nj00947b] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Synthesis of novel β-ketoiminate compounds (aluminium and gallium) which have been used for the first time as precursors in (AACVD).
Collapse
Affiliation(s)
- Caroline E. Knapp
- Department of Chemistry
- University College London
- Christopher Ingold Laboratories
- London
- UK
| | - Peter Marchand
- Department of Chemistry
- University College London
- Christopher Ingold Laboratories
- London
- UK
| | - Caragh Dyer
- Department of Chemistry
- University College London
- Christopher Ingold Laboratories
- London
- UK
| | - Ivan P. Parkin
- Department of Chemistry
- University College London
- Christopher Ingold Laboratories
- London
- UK
| | - Claire J. Carmalt
- Department of Chemistry
- University College London
- Christopher Ingold Laboratories
- London
- UK
| |
Collapse
|
17
|
Patil SA, Fahlman BD. Synthesis and characterization of new unsymmetrical β-diketiminate tris(dimethylamido)hafnium(IV) complexes as potential precursors for the MOCVD of HfO2. J COORD CHEM 2014. [DOI: 10.1080/00958972.2014.987764] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- Siddappa A. Patil
- Centre for Nano and Material Sciences, Jain University, Bangalore, India
- Science of Advanced Materials Program, Central Michigan University, Mount Pleasant, MI, USA
- Department of Chemistry, Central Michigan University, Mount Pleasant, MI, USA
| | - Bradley D. Fahlman
- Science of Advanced Materials Program, Central Michigan University, Mount Pleasant, MI, USA
- Department of Chemistry, Central Michigan University, Mount Pleasant, MI, USA
| |
Collapse
|
18
|
Marchand P, Pugh D, Parkin IP, Carmalt CJ. Synthesis and Structural characterization of β-ketoiminate-stabilized gallium hydrides for chemical vapor deposition applications. Chemistry 2014; 20:10503-13. [PMID: 25043194 DOI: 10.1002/chem.201402998] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2014] [Indexed: 11/06/2022]
Abstract
Bis-β-ketoimine ligands of the form [(CH2 )n {N(H)C(Me)CHC(Me)O}2 ] (L(n) H2 , n=2, 3 and 4) were employed in the formation of a range of gallium complexes [Ga(L(n) )X] (X=Cl, Me, H), which were characterised by NMR spectroscopy, mass spectrometry and single-crystal X-ray diffraction analysis. The β-ketoimine ligands have also been used for the stabilisation of rare gallium hydride species [Ga(L(n) )H] (n=2 (7); n=3 (8)), which have been structurally characterised for the first time, confirming the formation of five-coordinate, monomeric species. The stability of these hydrides has been probed through thermal analysis, revealing stability at temperatures in excess of 200 °C. The efficacy of all the gallium β-ketoiminate complexes as molecular precursors for the deposition of gallium oxide thin films by chemical vapour deposition (CVD) has been investigated through thermogravimetric analysis and deposition studies, with the best results being found for a bimetallic gallium methyl complex [L(3) {GaMe2 }2 ] (5) and the hydride [Ga(L(3) )H] (8). The resulting films (F5 and F8, respectively) were amorphous as-deposited and thus were characterised primarily by XPS, EDXA and SEM techniques, which showed the formation of stoichiometric (F5) and oxygen-deficient (F8) Ga2 O3 thin films.
Collapse
Affiliation(s)
- Peter Marchand
- Materials Chemistry Centre, Department of Chemistry, University College London, 20 Gordon Street, London, WC1H 0AJ (UK), Fax: (+44) 020-7679-7463
| | | | | | | |
Collapse
|
19
|
Scheiper C, Dittrich D, Wölper C, Bläser D, Roll J, Schulz S. Synthesis, Structure, and Catalytic Activity of Tridentate, Base-Functionalized β-Ketiminate Zinc Complexes in Ring-Opening Polymerization of Lactide. Eur J Inorg Chem 2014. [DOI: 10.1002/ejic.201301462] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
|
20
|
(Thio)phosphoryl-functionalized enaminoketones: Synthesis, structure, and complexing properties towards transition metal ions. J Organomet Chem 2014. [DOI: 10.1016/j.jorganchem.2013.12.010] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
|
21
|
Hassan IA, Parkin IP, Nair SP, Carmalt CJ. Antimicrobial activity of copper and copper(i) oxide thin films deposited via aerosol-assisted CVD. J Mater Chem B 2014; 2:2855-2860. [DOI: 10.1039/c4tb00196f] [Citation(s) in RCA: 66] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
High antimicrobial efficacy of Cu and Cu2O films, deposited via aerosol-assisted chemical vapour deposition, was observed against E. coli and S. aureus.
Collapse
Affiliation(s)
- Iman A. Hassan
- Materials Chemistry Centre
- Department of Chemistry
- University College London
- London, UK
| | - Ivan P. Parkin
- Materials Chemistry Centre
- Department of Chemistry
- University College London
- London, UK
| | - Sean P. Nair
- Department of Microbial Diseases
- UCL Eastman Dental Institute
- London, UK
| | - Claire J. Carmalt
- Materials Chemistry Centre
- Department of Chemistry
- University College London
- London, UK
| |
Collapse
|
22
|
|
23
|
Marchand P, Hassan IA, Parkin IP, Carmalt CJ. Aerosol-assisted delivery of precursors for chemical vapour deposition: expanding the scope of CVD for materials fabrication. Dalton Trans 2013; 42:9406-22. [PMID: 23629474 DOI: 10.1039/c3dt50607j] [Citation(s) in RCA: 199] [Impact Index Per Article: 18.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The production of thin films of materials has become the attention of a great deal of research throughout academia and industry worldwide owing to the array of applications which utilise them, including electronic devices, gas sensors, solar cells, window coatings and catalytic systems. Whilst a number of deposition techniques are in common use, chemical vapour deposition (CVD) is an attractive process for the production of a wide range of materials due to the control it offers over film composition, coverage and uniformity, even on large scales. Conventional CVD processes can be limited, however, by the need for suitably volatile precursors. Aerosol-assisted (AA)CVD is a solution-based process which relies on the solubility of the precursor, rather than its volatility and thus vastly extends the range of potentially applicable precursors. In addition, AACVD offers extra means to control film morphology and concurrently the properties of the deposited materials. In this perspective we discuss the AACVD process, the influence of deposition conditions on film characteristics and a number of materials and applications to which AACVD has been found beneficial.
Collapse
Affiliation(s)
- Peter Marchand
- Department of Chemistry, University College London, Christopher Ingold Laboratories, 20 Gordon Street, London, WC1H 0AJ, United Kingdom
| | | | | | | |
Collapse
|
24
|
Fan L, Wang Y, Yao Y, Wu B, Shen Q. Synthesis, Structure, and Catalytic Behavior of Ytterbium Complexes Derived from a Linked Bis(β-ketoiminato) Ligand. Z Anorg Allg Chem 2013. [DOI: 10.1002/zaac.201200565] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
|
25
|
González-Flores D, Patil SA, Medina PA, Dever S, Uthaisar C, Pineda LW, Montero ML, Ziller JW, Fahlman BD. Synthesis of hafnium(IV) β-ketoiminates as potential precursors for the MOCVD of HfO2. Inorganica Chim Acta 2013. [DOI: 10.1016/j.ica.2012.10.002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
26
|
|
27
|
Aprile A, Wilson DDJ, Richards AF. The synthesis and characterization of mono and dinuclear group 13 complexes derived from a Schiff base. Dalton Trans 2012; 41:8550-5. [DOI: 10.1039/c2dt30375b] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|