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1. Impact of interfacial effects on ferroelectric resistance switching of Au/BiFeO₃/Nb:SrTiO₃(100) Schottky junctions

Author:
He, Shumin; Liu, Guolei; Zhu, Yinlian; Ma, Xiuliang; Sun, Jirong; Kang, Shishou; Yan, Shishen; Chen, Yanxue; Mei, Liangmo; Jiao, Jun
Source:
RSC advances 2017 v.7 no.37 pp. 22715-22721
ISSN:
2046-2069
Subject:
gold
Abstract:
... Direct evidence of purely interfacial effects on resistance switching is demonstrated in Au/BiFeO₃/Nd:SrTiO₃(001) (Au/BFO/NSTO) Schottky junctions by reducing the thickness of ferroelectric interlayer BFO. The Au/BFO/NSTO junction shows large current rectification and hysteretic resistive switching behavior without any electroforming process. The conduction mechanism is dominated by interface-limi ...
DOI:
10.1039/c7ra02339a

2. Sensitive label-free sensor with high figure of merit based on plasmonic metasurface with unit cell of double two-split nanorings

Author:
Muhammad, Naseer; Ouyang, Zhengbiao; Liu, Qiang; Tang, Xiaopin; Deng, Zi-Lan; Daud Khan, Adnan
Source:
Journal of materials science 2019 v.54 no.8 pp. 6301-6309
ISSN:
0022-2461
Subject:
gold,   etc   ; nanogold; refractive index;     Show all 3 Subjects
Abstract:
... We theoretically propose a sensitive label-free sensor with high figure of merit (FoM) based on Fano resonances on a plasmonic metasurface whose unit cell consists of double two-split nanorings by finite-element method. The unit cell of the proposed Fano resonant structure comprises of two thin gold nanorings each with two splits. Two Fano modes are generated in near-infrared regime through symmet ...
DOI:
10.1007/s10853-018-03228-3

3. Unidirectional Real-Time Photoswitching of Diarylethene Molecular Monolayer Junctions with Multilayer Graphene Electrodes

Author:
Koo, Jeongmin; Jang, Yeonsik; Martin, León; Kim, Dongku; Jeong, Hyunhak; Kang, Keehoon; Lee, Woocheol; Kim, Junwoo; Hwang, Wang-Taek; Xiang, Dong; Scheer, Elke; Kabdulov, Mikhail; Huhn, Thomas; Pauly, Fabian; Lee, Takhee
Source:
ACS applied materials & interfaces 2019 v.11 no.12 pp. 11645-11653
ISSN:
1944-8252
Subject:
gold,   etc   ; electrodes; graphene; lighting;     Show all 4 Subjects
Abstract:
... We fabricate and characterize vertical molecular junctions consisting of self-assembled monolayers of diarylethene (DAE) contacted by a multilayer graphene (MLG) electrode on the top and gold on the bottom. The DAE molecular junctions show two stable electrical states, a closed state (high conductance) or an open state (low conductance), which are created upon illumination with UV or visible light ...
DOI:
10.1021/acsami.8b19372

4. Chiral and random arrangements of flavin chromophores along cyclic peptide nanotubes on gold influencing differently on surface potential and piezoelectricity

Author:
Kamano, Yusuke; Tabata, Yuki; Uji, Hirotaka; Kimura, Shunsaku
Source:
RSC advances 2019 v.9 no.7 pp. 3618-3624
ISSN:
2046-2069
Subject:
gold,   etc   ; nanogold; nanotubes;     Show all 3 Subjects
Abstract:
... Two kinds of peptide nanotubes are prepared from cyclo(β-Asp(flavin)-β-alanine-β-alanine) (C3FAA) and cyclo(β-Asp(flavin)-ethylenediamine-succinic acid) (C3FES). The flavin chromophores are protruding on the C3FAA and C3FES peptide nanotube surfaces in random and chiral ways, respectively. The surface potentials of the C3FAA nanotube bundles on a gold substrate become larger than the C3FES nanotub ...
DOI:
10.1039/c8ra10466b

5. Gold(I)-promoted synthesis of a β-(1,3)-glucan hexadecasaccharide via the highly convergent strategy

Author:
Wang, Zixuan; Hua, Qingting; Yang, You
Source:
Carbohydrate research 2019 v.482 pp. 107735
ISSN:
0008-6215
Subject:
gold,   etc   ; polysaccharides; structure-activity relationships;     Show all 3 Subjects
Abstract:
... Elucidation of the structure-activity relationships of β-(1,3)-glucans is hampered by the difficulty to isolate the β-(1,3)-glucan polysaccharides from natural sources. We describe a gold(I)-promoted approach for the efficient assembly of a β-(1,3)-glucan hexadecasaccharide via the orthogonal and consecutive activation of thioglycosides and glucosyl ortho-hexynylbenzoates in a highly convergent ma ...
DOI:
10.1016/j.carres.2019.06.014

6. Deciphering the origin of variation in the spin ground state and oxidation state of a {Mn₁₉} cluster on a Au(111) surface: is the Au(111) surface innocent?

Author:
Nabi, Rizwan; Rajaraman, Gopalan
Source:
Chemical communications 2019 v.55 no.57 pp. 8238-8241
ISSN:
1364-548X
Subject:
gold,   etc   ; ferrimagnetic materials; ions; oxidation;     Show all 4 Subjects
Abstract:
... Periodic DFT calculations on a {Mn₁₉} cluster possessing S = 83/2 ground state and its reduced variant on a Au(111) surface unravel the importance of structural distortions that triggered drastic variations in the J values leading to a large reduction in the spin ground state. Reduction of Mnᴵᴵᴵ ions leads to antiferromagnetic Js with a very small spin ground state manifesting the non-innocent beh ...
DOI:
10.1039/c9cc03714d

7. Synthesis and reactivity of [Au(NHC)(Bpin)] complexes

Author:
Zinser, Caroline M.; Nahra, Fady; Falivene, Laura; Brill, Marcel; Cordes, David B.; Slawin, Alexandra M. Z.; Cavallo, Luigi; Cazin, Catherine S. J.; Nolan, Steven P.
Source:
Chemical communications 2019 v.55 no.47 pp. 6799-6802
ISSN:
1364-548X
Subject:
gold,   etc   ; chemical reactions; methodology; synthesis;     Show all 4 Subjects
Abstract:
... A new class of [Au(NHC)(Bpin)] complexes has been synthesized and their unusual reactivity was investigated using computational and experimental methods. The gold–boryl complexes exhibit unexpected high stability and reactivity. ...
DOI:
10.1039/c9cc03171e

8. Gold(ii) in redox-switchable gold(i) catalysis

Author:
Veit, Philipp; Volkert, Carla; Förster, Christoph; Ksenofontov, Vadim; Schlicher, Steffen; Bauer, Matthias; Heinze, Katja
Source:
Chemical communications 2019 v.55 no.32 pp. 4615-4618
ISSN:
1364-548X
Subject:
gold,   etc   ; catalytic activity; chemical reactions;     Show all 3 Subjects
Abstract:
... Gold(ii) species catalyse the cyclisation of N(2-propyn-1-yl)benzamide to 2-phenyl-5-vinylidene-2-oxazoline without halide abstraction while the saturated gold(i) complex is inactive. Redox-switching between gold(ii) and gold(i) turns catalytic turnover on and off. ...
DOI:
10.1039/c9cc00283a

9. Correlation of Vibrational Excitations and Electronic Structure with Submolecular Resolution

Author:
Rolf, Daniela; Maaß, Friedrich; Lotze, Christian; Czekelius, Constantin; Heinrich, Benjamin W.; Tegeder, Petra; Franke, Katharina J.
Source:
Journal of physical chemistry 2019 v.123 no.12 pp. 7425-7430
ISSN:
1932-7455
Subject:
gold,   etc   ; asymmetry; physical chemistry; spectroscopy;     Show all 4 Subjects
Abstract:
... The detection of vibrational excitations of individual molecules on surfaces by scanning tunneling spectroscopy does not obey strict selection rules but rather propensity rules. The experimental verification of these excitations is challenging because it requires the independent variation of specific parameters, such as the electronic structure, while keeping the vibrational modes the same. Here, ...
DOI:
10.1021/acs.jpcc.8b11776

10. Gold-catalyzed [4+1]-annulation reactions between anthranils and 4-methoxy-1,2-dienyl-5-ynes involving a 1,2-allene shift

Author:
HsiehH.-C. Hsieh and K.-C. Tan contributed equally., Hsiang-Chu; Tan, Kuo-Chen; Kulandai Raj, Antony Sekar; Liu, Rai-Shung
Source:
Chemical communications 2019 v.55 no.13 pp. 1979-1982
ISSN:
1364-548X
Subject:
gold,   etc   ; carbenes; chemical reactions; quinoline;     Show all 4 Subjects
Abstract:
... Gold-catalyzed [4+1]-annulations of 4-methoxy-1,2-dienyl-5-ynes with anthranils are described. The mechanism of these annulations involves nitrene formation of α-imino gold carbenes that undergo a 1,2-allene shift to form (pyrrol-2-yl) methylgold intermediates. With allenyl ester substrates, these gold intermediates become enolate species to enable intramolecular aldol reactions to form useful pyr ...
DOI:
10.1039/c8cc09082c

11. AOT Bilayer Adsorption on Gold Surfaces: A Molecular Dynamics Study

Author:
Poghosyan, Armen H.; Adamyan, Maksim P.; Shahinyan, Aram A.; Koetz, Joachim
Source:
TheJournal of physical chemistry 2019 v.123 no.4 pp. 948-953
ISSN:
1520-5207
Subject:
gold,   etc   ; adsorption; molecular dynamics; sodium;     Show all 4 Subjects
Abstract:
... A molecular dynamics study was done to reveal the adsorption properties of sodium dioctyl sulfosuccinate (AOT) bilayers on gold Au(111) surfaces. Examining the rotational mobility of AOT molecules, we track that the correlation time of AOT molecules on the adsorbed layer is much higher. The data estimating the diffusive motion of AOT molecule show a substantially lower rate of diffusion (∼10–¹⁰ cm ...
DOI:
10.1021/acs.jpcb.8b11471

12. Building two-dimensional metal–organic networks with tin

Author:
Rodríguez, L. M.; Fuhr, J. D.; Machaín, P.; Ascolani, H.; Lingenfelder, M.; Gayone, J. E.
Source:
Chemical communications 2019 v.55 no.3 pp. 345-348
ISSN:
1364-548X
Subject:
gold,   etc   ; chemical reactions; ligands; tin;     Show all 4 Subjects
Abstract:
... We show that Sn atoms combined with organic ligands can be used to build 2D coordination networks on Au(111) surfaces. ...
DOI:
10.1039/c8cc08280d

13. Supramolecular chemistry of helical foldamers at the solid–liquid interface: self-assembled monolayers and anion recognition

Author:
Adam, Catherine; Faour, Lara; Bonnin, Valérie; Breton, Tony; Levillain, Eric; Sallé, Marc; Gautier, Christelle; Canevet, David
Source:
Chemical communications 2019 v.55 no.58 pp. 8426-8429
ISSN:
1364-548X
Subject:
gold,   etc   ; chemical reactions; electrodes; liquid-solid interface;     Show all 4 Subjects
Abstract:
... The synthesis of a redox-active helical foldamer and its immobilization onto a gold electrode are described. These large molecular architectures are grafted in a reproducible manner and provide foldamer-based self-assembled monolayers displaying recognition properties. ...
DOI:
10.1039/c9cc03851e

14. Gold and crude oil as safe-haven assets for clean energy stock indices: Blended copulas approach

Author:
Elie, Bouri; Naji, Jalkh; Dutta, Anupam; Uddin, Gazi Salah
Source:
Energy 2019 v.178 pp. 544-553
ISSN:
0360-5442
Subject:
gold,   etc   ; assets; clean energy; markets; petroleum;     Show all 5 Subjects
Abstract:
... In this study, we examine the potential roles of gold and crude oil as safe-haven assets against extreme down movements in clean energy stock indices. We employ copulas on daily data from November 21st, 2003 to March 30th, 2018 covering two clean energy stock indices, the S&P Global Clean Energy and the WilderHill Clean Energy. Instead of adopting a priori selection of the best copula function bas ...
DOI:
10.1016/j.energy.2019.04.155

15. Designing a new family of oxonium-cation based structurally diverse organic–inorganic hybrid iodoantimonate crystals

Author:
Parmar, Swati; Pal, Shiv; Biswas, Abhijit; Gosavi, Suresh; Chakraborty, Sudip; Reddy, Mallu Chenna; Ogale, Satishchandra
Source:
Chemical communications 2019 v.55 no.52 pp. 7562-7565
ISSN:
1364-548X
Subject:
gold,   etc   ; chemical reactions; crystals; nanogold; photoluminescence;     Show all 5 Subjects
Abstract:
... Several new structurally diverse carbonyl functional group-based iodoantimonate organic–inorganic hybrid crystals are synthesized using an in situ formed oxonium cationic precursor. These crystals exhibit interesting optoelectronic properties consistent with DFT calculations. Charge transfer and photoluminescence quenching between these crystals and Au nanoparticulate films are examined for potent ...
DOI:
10.1039/c9cc03485d

16. Single, double, and triple intercluster bonds: analyses of M₂Au₃₆(SR)₂₄ (M = Au, Pd, Pt) as 14-, 12- and 10-ve superatomic molecules

Author:
Muñoz-Castro, Alvaro
Source:
Chemical communications 2019 v.55 no.51 pp. 7307-7310
ISSN:
1364-548X
Subject:
gold,   etc   ; chemical bonding; chemical reactions; palladium; platinum;     Show all 5 Subjects
Abstract:
... The bonding picture of the experimentally characterized species derived from the M₂Au₃₆(SR)₂₄ cluster is discussed to indicate the occurrence of the classical notion of single, double and triple chemical bonds. The bond order can be reversibly controlled by tuning their charge states which is shown to be opportunely extended to clusters in favor of the conception of molecularly structured material ...
DOI:
10.1039/c9cc02970b

17. Interband Transitions Are More Efficient Than Plasmonic Excitation in the Ultrafast Melting of Electromagnetically Coupled Au Nanoparticles

Author:
Magnozzi, Michele; Proietti Zaccaria, Remo; Catone, Daniele; O’Keeffe, Patrick; Paladini, Alessandra; Toschi, Francesco; Alabastri, Alessandro; Canepa, Maurizio; Bisio, Francesco
Source:
Journal of physical chemistry 2019 v.123 no.27 pp. 16943-16950
ISSN:
1932-7455
Subject:
gold,   etc   ; heat; irradiation; melting; nanogold; wavelengths;     Show all 6 Subjects
Abstract:
... We investigated the effects of ultrafast laser excitation of Au nanoparticles (NPs) having strong interparticle electromagnetic coupling by irradiating the NPs either at interband or plasmon-resonance wavelengths (13–100 J/m² fluence regime). We observed that interband excitation is significantly more efficient than plasmonic excitation in reshaping, coalescing, and ultimately sublimating the NPs, ...
DOI:
10.1021/acs.jpcc.9b03668

18. A mechanistic study of B₃₆-supported atomic Au promoted CO₂ electroreduction to formic acid

Author:
Li, Wen-Ying; Zhao, Xiang; Dang, Jing-Shuang
Source:
Journal of materials chemistry A 2019 v.7 no.23 pp. 13935-13940
ISSN:
2050-7496
Subject:
gold,   etc   ; carbon dioxide; catalysts; electrochemistry; formic acid;     Show all 5 Subjects
Abstract:
... We introduce a single-atom catalyst in which atomic gold resides in the corner sites of a recently discovered B₃₆ cluster. By means of quantum chemistry calculations, we propose that B₃₆Au is capable of adsorbing CO₂ and promoting a highly active and selective CO₂ reduction process to form HCOOH, with a tiny electrochemical limiting potential of −0.08 V. ...
DOI:
10.1039/c9ta03983j

19. Synthesis of functionalized 3-isochromanones via metal-free intramolecular alkoxylation-initiated cascade cyclization

Author:
Zhang, Ying-Qi; Zhu, Xin-Qi; Xu, Yin; Bu, Hao-Zhen; Wang, Jia-Le; Zhai, Tong-Yi; Zhou, Jin-Mei; Ye, Long-Wu
Source:
Green chemistry 2019 v.21 no.11 pp. 3023-3028
ISSN:
1463-9270
Subject:
gold,   etc   ; catalytic activity; cyclization reactions; green chemistry;     Show all 4 Subjects
Abstract:
... A metal-free intramolecular alkoxylation-initiated cascade cyclization of allyl ether-tethered ynamides has been developed. Various highly functionalized 3-isochromanones can be obtained in generally good to excellent yields under mild reaction conditions. Moreover, this asymmetric cyclization has also been realized via a stereocontrolled [3,3] rearrangement by employing a traceless chiral directi ...
DOI:
10.1039/c9gc01030k

20. Over-spilling institutions: The political ecology of ‘greening’ the small-scale gold mining sector in Guyana

Author:
Hook, Andrew
Source:
Land use policy 2019 v.85 pp. 438-453
ISSN:
0264-8377
Subject:
gold,   etc   ; ecology; landscapes; mining; politics; Guyana;     Show all 6 Subjects
Abstract:
... This article applies a political ecology framework to examine the challenges of ‘greening’ Guyana’s relatively established small-scale gold mining sector. Based on a year of fieldwork conducted in Guyana’s gold mining landscape, the article highlights a range of ways in which the supposed stability and transparency of Guyana’s institutional mining framework is undermined by the dynamic and discret ...
DOI:
10.1016/j.landusepol.2019.03.049