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Parambath JBM, Vijai Anand K, Alawadhi H, Mohamed AA. Flexible Copper Films Modification via Spontaneous Reduction of Aryldiazonium Gold Salts: Unraveling Surface Properties and Energy Profile. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2024; 40:9797-9808. [PMID: 38669636 DOI: 10.1021/acs.langmuir.4c00977] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/28/2024]
Abstract
In this study, we report the modification of flexible copper films via the spontaneous reduction of aryldiazonium gold salts [X-4-C6H4N≡N]AuCl4 (X═COOH, NO2). The electroless modification involves dipping of flexible copper films in the aryldiazonium gold solutions for a few seconds, under ambient conditions, followed by a washing step with deionized water to obtain a mechanically robust gold-aryl coating. The chemical composition, morphology, electronic structure, and optical properties of the gold-aryl layer and the flexibility of the modified copper films are supported by the results from X-ray photoelectron spectroscopy (XPS), electrochemistry, contact angle, scanning electron microscopy (SEM), and ultraviolet photoelectron spectroscopy (UPS). XPS surface analysis showed metallic gold in addition to C-C, C-O/C-N, and C═O functional groups from the grafted aryls. Cu 2p showed metallic copper as a major component and a small amount of Cu(II) ions. Wettability studies showed that Au-COOH@Cu increased the contact angle of the bare copper films from 68.0 ± 0.7° to 82.0° ± 0.7°, while Au-NO2@Cu increased the contact angle to 134.0° ± 0.3°. UPS energy profile analysis of [HOOC-4-C6H4N≡N]AuCl4 (valence band maximum = 1.91 eV) exhibited greater reducibility than [O2N-4-C6H4N≡N]AuCl4 (valence band maximum = 2.91 eV). The lower ionization potential of [HOOC-4-C6H4N≡N]AuCl4 (IP = 4.33 eV) enhanced the reactivity upon copper film contact, potentially inducing efficient energy level alignment, compared with [O2N-4-C6H4N≡N]AuCl4 (IP = 5.62 eV). UPS results were further supported by electrochemistry investigation which revealed that [HOOC-4-C6H4N≡N]AuCl4 is easily reducible compared with [O2N-4-C6H4N≡N]AuCl4. The findings presented here hold significant implications for developing flexible copper films and pave the way for future advancements in electronic material modification for industrial applications.
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Affiliation(s)
- Javad B M Parambath
- Center for Advanced Materials Research, Research Institute of Sciences and Engineering, University of Sharjah, Sharjah 27272, United Arab Emirates
- Department of Physics, Sathyabama Institute of Science & Technology, Chennai 600 119, Tamil Nadu, India
- Department of Chemistry, Sathyabama Institute of Science & Technology, Chennai 600 119, Tamil Nadu, India
| | - Kabali Vijai Anand
- Department of Physics, Sathyabama Institute of Science & Technology, Chennai 600 119, Tamil Nadu, India
| | - Hussain Alawadhi
- Center for Advanced Materials Research, Research Institute of Sciences and Engineering, University of Sharjah, Sharjah 27272, United Arab Emirates
- Department of Applied Physics & Astronomy, College of Sciences, University of Sharjah, Sharjah 27272, United Arab Emirates
| | - Ahmed A Mohamed
- Center for Advanced Materials Research, Research Institute of Sciences and Engineering, University of Sharjah, Sharjah 27272, United Arab Emirates
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2
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Koswattage KR, Liyanage CJ, Maduwantha GDKV. Ultraviolet photoelectron spectroscopic study on the interface electronic structure of the L‐cysteine on Pd surface. SURF INTERFACE ANAL 2022. [DOI: 10.1002/sia.7065] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
| | | | - G. D. Kaveendra Virajith Maduwantha
- Faculty of Technology Sabaragamuwa University of Sri Lanka Belihuloya 70140 Sri Lanka
- Faculty of Graduate Studies Sabaragamuwa University of Sri Lanka Belihuloya 70140 Sri Lanka
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3
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Dominari A, Hathaway III D, Kapasi A, Paul T, Makkar SS, Castaneda V, Gara S, Singh BM, Agadi K, Butt M, Retnakumar V, Chittajallu S, Taugir R, Sana MK, KC M, Razzack S, Moallem N, Alvarez A, Talalaev M. Bottom-up analysis of emergent properties of N-acetylcysteine as an adjuvant therapy for COVID-19. World J Virol 2021; 10:34-52. [PMID: 33816149 PMCID: PMC7995409 DOI: 10.5501/wjv.v10.i2.34] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/29/2020] [Revised: 01/23/2021] [Accepted: 03/12/2021] [Indexed: 02/06/2023] Open
Abstract
N-acetylcysteine (NAC) is an abundantly available antioxidant with a wide range of antidotal properties currently best studied for its use in treating acetaminophen overdose. It has a robustly established safety profile with easily tolerated side effects and presents the Food and Drug Administration's approval for use in treating acetaminophen overdose patients. It has been proven efficacious in off-label uses, such as in respiratory diseases, heart disease, cancer, human immunodeficiency virus infection, and seasonal influenza. Clinical trials have recently shown that NAC's capacity to replenish glutathione stores may significantly improve coronavirus disease 2019 (COVID-19) outcomes, especially in high risk individuals. Interestingly, individuals with glucose 6-phosphate dehydrogenase deficiency have been shown to experience even greater benefit. The same study has concluded that NAC's ability to mitigate the impact of the cytokine storm and prevent elevation of liver enzymes, C-reactive protein, and ferritin is associated with higher success rates weaning from the ventilator and return to normal function in COVID-19 patients. Considering the background knowledge of biochemistry, current uses of NAC in clinical practice, and newly acquired evidence on its potential efficacy against COVID-19, it is worthwhile to investigate further whether this agent can be used as a treatment or adjuvant for COVID-19.
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Affiliation(s)
- Asimina Dominari
- Division of Research and Academic Affairs, Larkin Health System, South Miami, FL 33143, United States
| | - Donald Hathaway III
- Division of Research and Academic Affairs, Larkin Health System, South Miami, FL 33143, United States
| | - Abdulhusein Kapasi
- Division of Research and Academic Affairs, Larkin Health System, South Miami, FL 33143, United States
| | - Trissa Paul
- Division of Research and Academic Affairs, Larkin Health System, South Miami, FL 33143, United States
| | - Sarabjot Singh Makkar
- Division of Research and Academic Affairs, Larkin Health System, South Miami, FL 33143, United States
| | - Valeria Castaneda
- Division of Research and Academic Affairs, Larkin Health System, South Miami, FL 33143, United States
| | - Sirisha Gara
- Division of Research and Academic Affairs, Larkin Health System, South Miami, FL 33143, United States
| | - Bishnu Mohan Singh
- Division of Research and Academic Affairs, Larkin Health System, South Miami, FL 33143, United States
| | - Kuchalambal Agadi
- Division of Research and Academic Affairs, Larkin Health System, South Miami, FL 33143, United States
| | - Maliha Butt
- Division of Research and Academic Affairs, Larkin Health System, South Miami, FL 33143, United States
| | - Varadha Retnakumar
- Division of Research and Academic Affairs, Larkin Health System, South Miami, FL 33143, United States
| | - Spandana Chittajallu
- Division of Research and Academic Affairs, Larkin Health System, South Miami, FL 33143, United States
| | - Rahima Taugir
- Division of Research and Academic Affairs, Larkin Health System, South Miami, FL 33143, United States
| | - Muhammad Khawar Sana
- Division of Research and Academic Affairs, Larkin Health System, South Miami, FL 33143, United States
| | - Manish KC
- Division of Research and Academic Affairs, Larkin Health System, South Miami, FL 33143, United States
| | - Sarah Razzack
- Division of Research and Academic Affairs, Larkin Health System, South Miami, FL 33143, United States
| | - Niala Moallem
- Division of Research and Academic Affairs, Larkin Health System, South Miami, FL 33143, United States
| | - Alina Alvarez
- Division of Research and Academic Affairs, Larkin Health System, South Miami, FL 33143, United States
| | - Michael Talalaev
- Division of Research and Academic Affairs, Larkin Health System, South Miami, FL 33143, United States
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Rosenberg RA, Rozhkova EA, Novosad V. Investigations into Spin- and Unpolarized Secondary Electron-Induced Reactions in Self-Assembled Monolayers of Cysteine. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:2985-2992. [PMID: 33621100 DOI: 10.1021/acs.langmuir.1c00068] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Cysteine is the simplest thiolated, chiral amino acid and is often used as the anchor for studies of self-assembled monolayers (SAMs) of complex biomolecules such as peptides. Understanding the interaction of SAMs of cysteine with low-energy secondary electrons (SEs) produced by X-rays can further our understanding of radiation damage in biomolecules. In particular, if the electrons are polarized, chiral-selective chemistry could have bearing on the origin of homochirality in nature. In the present paper, we use synchrotron radiation-based X-ray photoelectron spectroscopy to determine the changes that occur in the bonding of self-assembled layers of cysteine on gold as a result of soft X-ray irradiation. To investigate the possibility of chiral selectivity resulting from the interaction of low-energy, spin-polarized SEs (SPSEs), measurements were conducted on cysteine adsorbed on a 3 nm-thick gold layer deposited on a CoPt thin-film multilayer with perpendicular magnetic anisotropy. Time-dependent measurements of the C 1s, N 1s, O 1s, S 2p, and Au 4f core levels are used to follow the changes in surface chemistry and determine reaction cross-sections as a function of SE exposure. Analysis of the data results in cross-sections in the range of 5-7 Mb and suggests possible reaction pathways. Changing the magnetization direction of the CoPt multilayer produces SPSEs with opposite polarity. Some evidence of spin-dependent reactions is indicated but is inconclusive. Possible reasons for the discrepancy are posited.
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Affiliation(s)
- R A Rosenberg
- Advanced Photon Source, Argonne National Laboratory, Lemont Illinois 60439, United States
| | - E A Rozhkova
- Center for Nanoscale Materials, Argonne National Laboratory, Lemont Illinois 60439, United States
| | - V Novosad
- Material Science Division, Argonne National Laboratory, Lemont Illinois 60439, United States
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Cys-functionalized AuNP substrates for improved sensing of the marine toxin STX by dynamic surface-enhanced Raman spectroscopy. Anal Bioanal Chem 2020; 412:4609-4617. [PMID: 32548768 DOI: 10.1007/s00216-020-02710-9] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2020] [Revised: 05/12/2020] [Accepted: 05/14/2020] [Indexed: 10/24/2022]
Abstract
Saxitoxin (STX) as one of the most harmful and typical paralytic shellfish toxins, is posing a serious threat to environmental and human health, thus it is essential to develop a sensitive and reliable analytical method for STX detection. Herein, we proposed a strategy for rapid and sensitive detection of STX with surface-enhanced Raman spectroscopy (SERS), by employing cysteine modified gold nanoparticles (Cys-AuNPs) as SERS probe to capture STX molecules through electrostatic interactions and multiple hydrogen bonds between Cys and STX molecules. Moreover, the XPS and zeta potential results indicated that Cys could bond to AuNPs through Au-S bonds and the addition of STX could induce the efficient aggregation of Cys-AuNPs owing to the presence of electrostatic interactions and multiple hydrogen bonds between Cys and STX molecules. Furthermore, considering the high sensitivity and stability of the dynamic surface-enhanced Raman spectroscopy (D-SERS) strategy with the formation of a 3D hotspot matrix, the highly sensitive detection of STX was realized to a level of 1 × 10-7 M by using the D-SERS strategy. Consequently, Cys-AuNPs as high affinity substrates can provide high sensitivity for the detection of STX through the D-SERS strategy. Graphical abstract.
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Luo Y, Shan H, Gao X, Qi P, Li Y, Li B, Rong X, Shen B, Zhang H, Lin F, Tang Z, Fang Z. Photoluminescence enhancement of MoS 2/CdSe quantum rod heterostructures induced by energy transfer and exciton-exciton annihilation suppression. NANOSCALE HORIZONS 2020; 5:971-977. [PMID: 32313908 DOI: 10.1039/c9nh00802k] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Energy transfer in heterostructures is an essential interface interaction for extraordinary energy conversion properties, which promote promising applications in light-emitting and photovoltaic devices. However, when atomic-layered transition metal dichalcogenides (TMDCs) act as the energy acceptor because of strong Coulomb interactions, the transferred energy can be consumed by nonradiative exciton annihilations, which hampers the development of light-emitting devices. Hence, revealing the mechanism of energy transfer and the related relaxation processes from the aspect of the acceptor in the heterostructure is key to reducing nonradiative loss and optimizing luminescence. Here, we study the exciton dynamics from the standpoint of the acceptor in MoS2/CdSe quantum rod (QR) heterostructures and realize efficiently enhanced photoluminescence (PL). Through femtosecond pump-probe measurements, it is directly observed that energy transfer from CdSe QRs largely raises the exciton population of the acceptor, MoS2, providing a larger emission "source". In addition, the dielectric environment introduced by CdSe QRs efficiently enhances the PL by suppressing exciton-exciton annihilation (EEA). This study provides new insights for on-chip applications such as light-emitting diodes and optical conversion devices based on low dimensional semiconductor heterostructures.
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Affiliation(s)
- Yang Luo
- School of Physics, State Key Laboratory for Mesoscopic Physics, Academy for Advanced Interdisciplinary Studies, Collaborative Innovation Center of Quantum Matter, and Nano-optoelectronics Frontier Center of Ministry of Education, Peking University, Beijing 100871, P. R. China.
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7
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Koswattage KR, Ishii H. Photoemission investigation of interaction between L‐cysteine and silver surface. SURF INTERFACE ANAL 2020. [DOI: 10.1002/sia.6771] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Kaveenga Rasika Koswattage
- Faculty of TechnologySabaragamuwa University of Sri Lanka Belihuloya Sri Lanka
- Faculty of Applied SciencesSabaragamuwa University of Sri Lanka Belihuloya Sri Lanka
| | - Hisao Ishii
- Center for Frontier ScienceChiba University Chiba Japan
- Graduate School of Advanced Integration ScienceChiba University Chiba Japan
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8
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Yokota Y, Akiyama S, Kaneda Y, Imanishi A, Inagaki K, Morikawa Y, Fukui KI. Computational investigations of electronic structure modifications of ferrocene-terminated self-assembled monolayers: effects of electron donating/withdrawing functional groups attached on the ferrocene moiety. Phys Chem Chem Phys 2017; 19:32715-32722. [PMID: 29199295 DOI: 10.1039/c7cp07279a] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
The electrochemical properties of chemically modified electrodes have long been a significant focus of research. Although the electronic states are directly related to the electrochemical properties, there have been only limited systematic efforts to reveal the electronic structures of adsorbed redox molecules with respect to the local environment of the redox center. In this study, density functional theory (DFT) calculations were performed for ferrocene-terminated self-assembled monolayers with different electron-donating abilities, which can be regarded as the simplest class of chemically modified electrodes. We revealed that the local electrostatic potentials, which are changed by the electron donating/withdrawing functional groups at the ferrocene moiety and the dipole field of coadsorbed inert molecules, practically determine the density of states derived from the highest occupied molecular orbital (HOMO) and its vicinities (HOMO-1 and HOMO-2) with respect to the electrode Fermi level. Therefore, to design new, sophisticated electrodes with chemical modification, one should consider not only the electronic properties of the constituent molecules, but also the local electrostatic potentials formed by these molecules and coadsorbed inert molecules.
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Affiliation(s)
- Yasuyuki Yokota
- Surface and Interface Science Laboratory, RIKEN, Wako, Saitama 351-0198, Japan.
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9
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Wang C, Luo X, Jia Z. Linkage, charge state and layer of L-Cysteine on copper surfaces. Colloids Surf B Biointerfaces 2017; 160:33-39. [PMID: 28915499 DOI: 10.1016/j.colsurfb.2017.09.015] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2017] [Revised: 08/24/2017] [Accepted: 09/06/2017] [Indexed: 11/17/2022]
Abstract
The control of linkage and charge state between biomolecules and metals represents a key issue for the architect of bioactive systems. In this paper, the linkage, charge state and layer of L-Cysteine (L-Cys) self-assembled films were handled on copper surfaces at pH=6.86. Cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) were performed to measure the film quality and the details of self-assembled progress. X-ray photoelectron spectroscopy (XPS) and quantum chemical calculations of density functional theory (DFT) were used to characterize the linkage, charge state and layer of the L-Cys molecules on copper surfaces. The results indicate that, from 0s to 24h, the self-assembled process can be classified as three steps, fast adsorption at the beginning, and then rearrangement to form a monolayer, and then the formation of double layer. And L-Cys molecules link to the copper surface through CuS bond, not CuN bond. The thickness of monolayer is 10.5Å. Then the L-Cys molecules of second layer recline on the first layer. Finally, by the interaction of amine group and carboxylic acid group between the two layers, the second self-assembled film stands uprightly, and the -S- group of the second layer point outward. The thickness of the double layer is 19.7Å. All the Cu/L-Cys films have negative charges because the pH (6.86) of the self-assembled solution is more than the isoelectric point of the L-Cys (5.05).
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Affiliation(s)
- Chuntao Wang
- Department of Chemistry, Taiyuan Normal University, Jinzhong, 030619, PR China; Institute of Energy and Environmental Electrochemistry, Taiyuan Normal University, Jinzhong, 030619, PR China.
| | - Xiaoxiao Luo
- Stuart School of Business, Illinois Institute of Technology, Chicago, 60661-3061,USA
| | - Zehui Jia
- Department of Chemistry, Taiyuan Normal University, Jinzhong, 030619, PR China; Institute of Energy and Environmental Electrochemistry, Taiyuan Normal University, Jinzhong, 030619, PR China
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Hao Y, Yu L, Dai C, Li S, Yu Y, Ju B, Li M, Zhang SXA. Manipulation of Inorganic Atomic-Layer Networks by Solution-Phase Co-assembly. Chemistry 2017; 23:13525-13532. [DOI: 10.1002/chem.201703200] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2017] [Indexed: 11/12/2022]
Affiliation(s)
- Yajiao Hao
- State Key Laboratory of Supramolecular Structure and Materials; College of Chemistry; Jilin University; Changchun 130012 P.R. China
| | - Lin Yu
- State Key Laboratory of Supramolecular Structure and Materials; College of Chemistry; Jilin University; Changchun 130012 P.R. China
| | - Chuying Dai
- State Key Laboratory of Supramolecular Structure and Materials; College of Chemistry; Jilin University; Changchun 130012 P.R. China
| | - Song Li
- State Key Laboratory of Supramolecular Structure and Materials; College of Chemistry; Jilin University; Changchun 130012 P.R. China
| | - Yang Yu
- State Key Laboratory of Supramolecular Structure and Materials; College of Chemistry; Jilin University; Changchun 130012 P.R. China
| | - Bo Ju
- State Key Laboratory of Supramolecular Structure and Materials; College of Chemistry; Jilin University; Changchun 130012 P.R. China
| | - Minjie Li
- State Key Laboratory of Supramolecular Structure and Materials; College of Chemistry; Jilin University; Changchun 130012 P.R. China
| | - Sean Xiao-An Zhang
- State Key Laboratory of Supramolecular Structure and Materials; College of Chemistry; Jilin University; Changchun 130012 P.R. China
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Bürgi T. Properties of the gold-sulphur interface: from self-assembled monolayers to clusters. NANOSCALE 2015; 7:15553-67. [PMID: 26360607 DOI: 10.1039/c5nr03497c] [Citation(s) in RCA: 139] [Impact Index Per Article: 15.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
The gold-sulphur interface of self-assembled monolayers (SAMs) was extensively studied some time ago. More recently tremendous progress has been made in the preparation and characterization of thiolate-protected gold clusters. In this feature article we address different properties of the two systems such as their structure, the mobility of the thiolates on the surface and other dynamical aspects, the chirality of the structures and characteristics related to it and their vibrational properties. SAMs and clusters are in the focus of different communities that typically use different experimental approaches to study the respective systems. However, it seems that the nature of the Au-S interfaces in the two cases is quite similar. Recent single crystal X-ray structures of thiolate-protected gold clusters reveal staple motifs characterized by gold ad-atoms sandwiched between two sulphur atoms. This finding contradicts older work on SAMs. However, newer studies on SAMs also reveal ad-atoms. Whether this finding can be generalized remains to be shown. In any case, more and more studies highlight the dynamic nature of the Au-S interface, both on flat surfaces and in clusters. At temperatures slightly above ambient thiolates migrate on the gold surface and on clusters. Evidence for desorption of thiolates at room temperature, at least under certain conditions, has been demonstrated for both systems. The adsorbed thiolate can lead to chirality at different lengths scales, which has been shown both on surfaces and for clusters. Chirality emerges from the organization of the thiolates as well as locally at the molecular level. Chirality can also be transferred from a chiral surface to an adsorbate, as evidenced by vibrational spectroscopy.
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Affiliation(s)
- Thomas Bürgi
- Department of Physical Chemistry, University of Geneva, Quai Ernest-Ansermet 30, 1211 Geneva 4, Switzerland.
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12
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Interface Electronic Structures of the L-Cysteine on Noble Metal Surfaces Studied by Ultraviolet Photoelectron Spectroscopy. E-JOURNAL OF SURFACE SCIENCE AND NANOTECHNOLOGY 2015. [DOI: 10.1380/ejssnt.2015.373] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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13
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Ndokoye P, Ke J, Liu J, Zhao Q, Li X. L-cysteine-modified gold nanostars for SERS-based copper ions detection in aqueous media. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:13491-13497. [PMID: 25338810 DOI: 10.1021/la503553y] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Gold nanostars coated with cysteine (Cys-AuNSs) were successfully synthesized and used in SERS-based copper ions (Cu(2+)) detection in aqueous media. The strong coordination ability of cysteine (Cys) with Cu(2+) and the resulting Cys-AuNSs-Cu complex formation led to AuNSs aggregation and the drastic change in intensity and strength of COOH band spectra. The aggregation of AuNSs yielded distinct SERS signals, which exhibited remarkable sensitivity and selectivity for Cu(2+) over other metal ions. Using this SERS-based sensing method, we have achieved a practical detection limit of 10 μM. Such AuNSs-based detection could provide promising alternative choices for future SERS-active AuNSs application.
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Affiliation(s)
- Pancras Ndokoye
- Key Laboratory of Industrial Ecology and Environmental Engineering, Key Laboratory of Fine Chemicals, School of Environmental Sciences and Technology, Dalian University of Technology , Dalian 116024, People's Republic of China
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14
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Lin P, Ding L, Lin CW, Gu F. Nonfouling property of zwitterionic cysteine surface. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:6497-6507. [PMID: 24841849 DOI: 10.1021/la500243s] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Applications of implantable bioelectronics for analytical and curative purposes are currently limited by their poor long-term biofunctionality in physiological media and nonspecific interactions with biomolecules. In an attempt to prolong in vivo functionality, recent advances in surface modifications have demonstrated that zwitterionic coatings can rival the performance of conventional poly(ethylene glycol) polymers in reducing nonspecific protein fouling. Herein, we report the fabrication of a very thin layer of nonfouling zwitterionic cysteine surface capable of protecting implantable bioelectronics from nonspecific adsorption of plasma proteins. This work is the first of its kind to fabricate, through solution chemistry, a cysteine surface exhibiting zwitterionic state as high as 88% and to demonstrate antibiofouling under the exposure of bovine serum albumin (BSA) and human serum. The fabricated surface utilized a minimal amount of gold substrate, approximately 10 nm, and an extremely thin antifouling layer at 1.14 nm verified by ellipsometry. X-ray photoelectron spectroscopy assessment of the nitrogen (N1s) and carbon (C1s) spectra conclude that 87.8% of the fabricated cysteine surface is zwitterionic, 2.5% is positively charged, and 9.6% is noncharged. Antibiofouling performance of the cysteine surface is quantitatively determined by bicinchoninic acid (BCA) protein assay as well as qualitatively confirmed using scanning electron spectroscopy. Cysteine surfaces demonstrated a BSA fouling of 3.9 ± 4.84% μg/cm(2), which is 93.6% and 98.5% lower than stainless steel and gold surfaces, respectively. Surface plasmon resonance imaging analysis returned similar results and suggest that a thinner cysteine coating will enhance performance. Scanning electron microscopy confirmed the results of BCA assay and suggested that the cysteine surface demonstrated a 69% reduction to serum fouling. The results reported in this paper demonstrate that it is possible to achieve a highly zwitterionic surface through solution chemistry on a macroscopic level that is capable of improving biocompatibility of long-term implantable bioelectronics.
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Affiliation(s)
- Peter Lin
- Department of Chemical Engineering, Waterloo Institute for Nanotechnology, University of Waterloo , Waterloo, Ontario N2L 3G1, Canada
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15
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Caprile L, Cossaro A, Falletta E, Della Pina C, Cavalleri O, Rolandi R, Terreni S, Ferrando R, Rossi M, Floreano L, Canepa M. Interaction of L-cysteine with naked gold nanoparticles supported on HOPG: a high resolution XPS investigation. NANOSCALE 2012; 4:7727-7734. [PMID: 23135640 DOI: 10.1039/c2nr32741d] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
We report the results of a synchrotron-based high-resolution XPS study of the interaction of L-cysteine (Cys) with well-characterized colloidal gold nanoparticles (NPs, typical size 3-4 nm), which were pre-deposited on highly oriented pyrolytic graphite and then brought into contact with the aqueous solution of Cys by drop-casting. By comparison with data previously obtained for Cys deposition on flat Au substrates (single crystals and high quality films), we demonstrate the formation of a strong Cys/NP thiolate bond. The analysis of the line shape and adsorbate-induced Au 4f core level shift, backed by simulations of the NP structure, reveals the interaction of Cys with low-coordinated Au atoms belonging to the NP edge and corners. The analysis of the N 1s core-level indicates that neutral molecules are the most abundant species. The small facet size limits the formation of extended networks of zwitterionic molecules, typical of single crystal surfaces. This study provides a spectroscopic insight into the intense poisoning effect caused by a limited amount of Cys on Au catalysts described in previous reports.
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Affiliation(s)
- Laura Caprile
- CNISM and Dipartimento di Fisica, Universitá di Genova, via Dodecaneso 33, Genova, Italy
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16
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Blum M, Odelius M, Weinhardt L, Pookpanratana S, Bär M, Zhang Y, Fuchs O, Yang W, Umbach E, Heske C. Ultrafast Proton Dynamics in Aqueous Amino Acid Solutions Studied by Resonant Inelastic Soft X-ray Scattering. J Phys Chem B 2012; 116:13757-64. [DOI: 10.1021/jp302958j] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- M. Blum
- Department of Chemistry, University of Nevada, Las Vegas, Nevada,
United States
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California, United States
- Experimentelle Physik
VII, Universität Würzburg, Würzburg, Germany
| | - M. Odelius
- Fysikum, Albanova University Center, Stockholm University, Stockholm, Sweden
| | - L. Weinhardt
- Department of Chemistry, University of Nevada, Las Vegas, Nevada,
United States
- Experimentelle Physik
VII, Universität Würzburg, Würzburg, Germany
| | - S. Pookpanratana
- Department of Chemistry, University of Nevada, Las Vegas, Nevada,
United States
| | - M. Bär
- Department of Chemistry, University of Nevada, Las Vegas, Nevada,
United States
- Solar Energy Research, Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Berlin, Germany
- Brandenburgische Technische Universität, Cottbus, Germany
| | - Y. Zhang
- Department of Chemistry, University of Nevada, Las Vegas, Nevada,
United States
| | - O. Fuchs
- Experimentelle Physik
VII, Universität Würzburg, Würzburg, Germany
| | - W. Yang
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California, United States
| | | | - C. Heske
- Department of Chemistry, University of Nevada, Las Vegas, Nevada,
United States
- Institute for Chemical
Technology and Polymer Chemistry, Karlsruhe Institute of Technology, Karlsruhe, Germany
- ANKA Synchrotron
Radiation Facility, Karlsruhe Institute of Technology, Karlsruhe, Germany
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Zhu A, Liu Y, Rui Q, Tian Y. Selective and sensitive determination of hydroxyl radicals generated from living cells through an electrochemical impedance method. Chem Commun (Camb) 2011; 47:4279-81. [DOI: 10.1039/c0cc05821a] [Citation(s) in RCA: 38] [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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18
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Liu Y, Zhu A, Tian Y. Fluorescence imaging of hydroxyl radicals at superhydrophobic gold flower-like surface in photocatalytic system. Analyst 2011; 136:1106-8. [DOI: 10.1039/c0an00821d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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19
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Pineider F, Mannini M, Danieli C, Armelao L, Piras FM, Magnani A, Cornia A, Sessoli R. Deposition of intact tetrairon(iii) single molecule magnet monolayers on gold: an STM, XPS, and ToF-SIMS investigation. ACTA ACUST UNITED AC 2010. [DOI: 10.1039/b916895h] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Canepa M, Lavagnino L, Pasquali L, Moroni R, Bisio F, De Renzi V, Terreni S, Mattera L. Growth dynamics of L-cysteine SAMs on single-crystal gold surfaces: a metastable deexcitation spectroscopy study. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2009; 21:264005. [PMID: 21828453 DOI: 10.1088/0953-8984/21/26/264005] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
We report on a metastable deexcitation spectroscopy investigation of the growth of L-cysteine layers deposited under UHV conditions on well-defined Au(110)- (1 × 2) and Au(111) surfaces. The interaction of He(*) with molecular orbitals gave rise to well-defined UPS-like Penning spectra which provided information on the SAM assembly dynamics and adsorption configurations. Penning spectra have been interpreted through comparison with molecular orbital DFT calculations of the free molecule and have been compared with XPS results of previous works. Regarding adsorption of first-layer molecules at room temperature (RT), two different growth regimes were observed. On Au(110), the absence of spectral features related to orbitals associated with SH groups indicated the formation of a compact SAM of thiolate molecules. On Au(111), the data demonstrated the simultaneous presence, since the early stages of growth, of strongly and weakly bound molecules, the latter showing intact SH groups. The different growth mode was tentatively assigned to the added rows of the reconstructed Au(110) surface which behave as extended defects effectively promoting the formation of the S-Au bond. The growth of the second molecular layer was instead observed to proceed similarly for both substrates. Second-layer molecules preferably adopt an adsorption configuration in which the SH group protrudes into the vacuum side.
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Affiliation(s)
- M Canepa
- CNISM and Department of Physics, University of Genova, via Dodecaneso 33, I-16145 Genova, Italy
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Kai M, Takeda K, Morita T, Kimura S. Distance dependence of long-range electron transfer through helical peptides. J Pept Sci 2007; 14:192-202. [DOI: 10.1002/psc.974] [Citation(s) in RCA: 67] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Cossaro A, Terreni S, Cavalleri O, Prato M, Cvetko D, Morgante A, Floreano L, Canepa M. Electronic and geometric characterization of the L-cysteine paired-row phase on Au(110). LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2006; 22:11193-8. [PMID: 17154602 DOI: 10.1021/la061833r] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
We have studied the vapor-phase deposition of L-cysteine on the Au(110) surface by means of synchrotron-based techniques. Relying on a comparison with previous X-ray photoemission analysis, we have assigned the fine structure of the C K-shell X-ray absorption spectra to the nonequivalent carbon bonds within the molecule. In particular, the C1s --> sigma* transition, where the sigma* state is mainly localized on the C-S bond, is shifted well below the ionization threshold, at approximately -5 eV from the characteristic pi* transition line related to carboxylic group. From the polarization dependence of the absorption spectra in the monolayer coverage range, the molecules are found to lay flat on the surface with both the C-S bond and the carboxylic group almost parallel to the surface. We performed in situ complementary surface X-ray diffraction, SXRD, measurements to probe the rearrangement of the Au atoms beneath the L-cysteine molecules. Since the early stage of deposition, L-cysteine domains are formed which display an intermediate fourfold symmetry along [001]. The self-assembly of molecules into paired rows, extending along the [1(-)10] direction, is fully compatible with our observations, as has been reported for the case of D-cysteine molecules grown on Au(110) [Kühnle, A. et al. Phys. Rev. Lett. 2004, 93, 086101.]
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Affiliation(s)
- Albano Cossaro
- CNR-INFM Laboratorio Nazionale TASC, Basovizza SS-14, Km 163.5, I-34012 Trieste, Italy
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Gonella G, Terreni S, Cvetko D, Cossaro A, Mattera L, Cavalleri O, Rolandi R, Morgante A, Floreano L, Canepa M. Ultrahigh Vacuum Deposition of l-Cysteine on Au(110) Studied by High-Resolution X-ray Photoemission: From Early Stages of Adsorption to Molecular Organization. J Phys Chem B 2005; 109:18003-9. [PMID: 16853311 DOI: 10.1021/jp051549t] [Citation(s) in RCA: 106] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We report on a high-resolution X-ray photoemission spectroscopy study on molecular-thick layers of L-cysteine deposited under ultrahigh vacuum conditions on Au(110). The analysis of core level shifts allowed us to distinguish unambiguously the states of the first-layer molecules from those of molecules belonging to the second layer. The first-layer molecules strongly interact with the metal through their sulfur headgroup. The multipeaked structure of the N 1s, O 1s, and C 1s core levels is interpreted in terms of different molecular moieties. The neutral acidic fraction (HSCH2CH(NH2)COOH) is abundant at low coverage likely associated with isolated molecules or dimers. The zwitterionic phase (HSCH2CH(NH3+)COO-) is largely dominant as the coverage approaches the monolayer limit and is related to the formation of ordered self-assembled molecular structures indicated by electron diffraction patterns. The occurrence of a small amount of cationic molecules (HSCH2CH(NH3+)COOH) is also discussed. The second-layer molecules mainly display zwitterionic character and are weakly adsorbed. Mild annealing up to 100 degrees C leads to the desorption of the second-layer molecules leaving electronic states of the first layer unaltered.
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Affiliation(s)
- Grazia Gonella
- Dipartimento di Fisica, Università di Genova, via Dodecaneso 33, 16146 Genova, Italy
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