1
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Wu Y, Zhou Y, Jiao X, She Y, Zeng W, Cui H, Pan C. Development and inter-laboratory validation of analytical methods for glufosinate and its two metabolites in foods of plant origin. Anal Bioanal Chem 2024; 416:663-674. [PMID: 36693955 DOI: 10.1007/s00216-023-04542-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2022] [Revised: 01/08/2023] [Accepted: 01/12/2023] [Indexed: 01/26/2023]
Abstract
Glufosinate is widely used to control various weeds. Glufosinate and its main metabolites have become the focus of attention because of their high water solubility and persistence in aquatic systems. Quantification of the agrochemical product and its metabolite residues is essential for the safety of agricultural products. In this study, a highly specific, simple method was developed to directly determine glufosinate and its metabolite residues in 21 plant origin foods by liquid chromatography with tandem mass spectrometry (LC-MS/MS), and it was validated on 11 foods in five laboratories. Finally, the repeatability limit, reproducibility limit, and uncertainty of the method were calculated based on these validated data and used to support the more accurate detection results. Four different chromatographic columns were used to analyze three target compounds, and the anionic polar pesticide column showed the optimum separation and peak shape. Composition of the mobile phase, extraction solvent, and the clean-up procedure were optimized. The developed method was validated on 21 plant origin foods. The average recoveries were 74-115% for all matrices. The validation results of five laboratories showed this method had a good repeatability (RSDr < 9.5%) and reproducibility (RSDR < 18.9%). The method validation parameters met the requirements of guidance established by the European Union (EU) and China for pesticide residue analysis. This methodology can be used for a routine monitoring that performs well for glufosinate and its metabolite residues.
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Affiliation(s)
- Yangliu Wu
- Innovation Center of Pesticide Research, Department of Applied Chemistry, College of Science, China Agricultural University, 2 Yuanmingyuan Western Road, Haidian District, Beijing, 100193, China
| | - Yilu Zhou
- Innovation Center of Pesticide Research, Department of Applied Chemistry, College of Science, China Agricultural University, 2 Yuanmingyuan Western Road, Haidian District, Beijing, 100193, China
| | - Xun Jiao
- Institute of Quality Standard and Testing Technology for Agro-Products, Chinese Academy of Agricultural Sciences, Beijing, 100193, China
| | - Yongxin She
- Institute of Quality Standard and Testing Technology for Agro-Products, Chinese Academy of Agricultural Sciences, Beijing, 100193, China
| | - Wenbo Zeng
- Innovation Center of Pesticide Research, Department of Applied Chemistry, College of Science, China Agricultural University, 2 Yuanmingyuan Western Road, Haidian District, Beijing, 100193, China
| | - Hailan Cui
- Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, 100193, China
| | - Canping Pan
- Innovation Center of Pesticide Research, Department of Applied Chemistry, College of Science, China Agricultural University, 2 Yuanmingyuan Western Road, Haidian District, Beijing, 100193, China.
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2
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Yang CJ, Anand A, Huang CC, Lai JY. Unveiling the Power of Gabapentin-Loaded Nanoceria with Multiple Therapeutic Capabilities for the Treatment of Dry Eye Disease. ACS NANO 2023; 17:25118-25135. [PMID: 38051575 DOI: 10.1021/acsnano.3c07817] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/07/2023]
Abstract
Dry eye (DE) disease, which is primarily linked to aqueous deficiency, is an escalating health issue worldwide, mainly due to the widespread use of electronic devices. The major obstacles in DE pharmacotherapy include insufficient therapeutic efficacy and low ocular bioavailability. This study presents the development of a ceria-based nanosystem to carry gabapentin (GBT), aiming to offer comprehensive relief from DE symptoms. We prepared multifunctional nanoceria capped with thiolated gelatin followed by cross-linking with glutaraldehyde, yielding a nanocarrier with desirable biocompatibility and antioxidant, anti-inflammatory, antiangiogenic, antiapoptotic, and neuronal protective activities. Specifically, the highly abundant thiol groups on gelatin increased the cellular uptake of the nanocarrier by 2.3-fold and its mucin-binding efficiency by 10-fold, thereby extending ocular retention and amplifying therapeutic activity. Moderate cross-linking of the thiolated gelatin not only enhanced the ocular bioavailability of the nanoceria but also provided slow, degradation-controlled release of GBT to promote the lacrimal stimulation to restore the tear film. In a rabbit model of DE, topical administration of our GBT/nanoceria nanoformulation resulted in comprehensive alleviation of symptoms, including repairing corneal epithelial damage, preserving corneal nerve density, and stimulating tear secretion, demonstrating superior performance in comparison to the free drug. These results underscore the safety and potential of this innovative nanoformulation for DE pharmacotherapy.
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Affiliation(s)
- Chia-Jung Yang
- Department of Biomedical Engineering, Chang Gung University, Taoyuan 33302, Taiwan
| | - Anisha Anand
- Department of Biomedical Engineering, Chang Gung University, Taoyuan 33302, Taiwan
| | - Chih-Ching Huang
- Department of Bioscience and Biotechnology, National Taiwan Ocean University, Keelung 202301, Taiwan
- Center of Excellence for the Oceans, National Taiwan Ocean University, Keelung 202301, Taiwan
- School of Pharmacy, College of Pharmacy, Kaohsiung Medical University, Kaohsiung 80708, Taiwan
| | - Jui-Yang Lai
- Department of Biomedical Engineering, Chang Gung University, Taoyuan 33302, Taiwan
- Department of Ophthalmology, Chang Gung Memorial Hospital, Linkou, Taoyuan 33305, Taiwan
- Department of Materials Engineering, Ming Chi University of Technology, New Taipei City 24301, Taiwan
- Research Center for Chinese Herbal Medicine, College of Human Ecology, Chang Gung University of Science and Technology, Taoyuan 33303, Taiwan
- Center for Biomedical Engineering, Chang Gung University, Taoyuan 33302, Taiwan
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3
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Annušová A, Labudová M, Truchan D, Hegedűšová V, Švajdlenková H, Mičušík M, Kotlár M, Pribusová Slušná L, Hulman M, Salehtash F, Kálosi A, Csáderová L, Švastová E, Šiffalovič P, Jergel M, Pastoreková S, Majková E. Selective Tumor Hypoxia Targeting Using M75 Antibody Conjugated Photothermally Active MoO x Nanoparticles. ACS OMEGA 2023; 8:44497-44513. [PMID: 38046334 PMCID: PMC10688043 DOI: 10.1021/acsomega.3c01934] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/22/2023] [Revised: 07/24/2023] [Accepted: 11/02/2023] [Indexed: 12/05/2023]
Abstract
Photothermal therapy (PTT) mediated at the nanoscale has a unique advantage over currently used cancer treatments, by being spatially highly specific and minimally invasive. Although PTT combats traditional tumor treatment approaches, its clinical implementation has not yet been successful. The reasons for its disadvantage include an insufficient treatment efficiency or low tumor accumulation. Here, we present a promising new PTT platform combining a recently emerged two-dimensional (2D) inorganic nanomaterial, MoOx, and a tumor hypoxia targeting element, the monoclonal antibody M75. M75 specifically binds to carbonic anhydrase IX (CAIX), a hypoxia marker associated with many solid tumors with a poor prognosis. The as-prepared nanoconjugates showed highly specific binding to cancer cells expressing CAIX while being able to produce significant photothermal yield after irradiation with near-IR wavelengths. Small aminophosphonic acid linkers were recognized to be more effective over the combination of poly(ethylene glycol) chain and biotin-avidin-biotin bridge in constructing a PTT platform with high tumor-binding efficacy. The in vitro cellular uptake of nanoconjugates was visualized by high-resolution fluorescence microscopy and label-free live cell confocal Raman microscopy. The key to effective cancer treatment may be the synergistic employment of active targeting and noninvasive, tumor-selective therapeutic approaches, such as nanoscale-mediated PTT. The use of active targeting can streamline nanoparticle delivery increasing photothermal yield and therapeutic success.
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Affiliation(s)
- Adriana Annušová
- Institute
of Physics, Slovak Academy of Sciences, Dúbravská cesta 9, 845 11 Bratislava, Slovakia
- Centre
for Advanced Materials Application, Slovak
Academy of Sciences, Dúbravská cesta 9, 845
11 Bratislava, Slovakia
| | - Martina Labudová
- Centre
for Advanced Materials Application, Slovak
Academy of Sciences, Dúbravská cesta 9, 845
11 Bratislava, Slovakia
- Institute
of Virology, Biomedical Research Center,
Slovak Academy of Sciences, Dúbravská cesta 9, 845 05 Bratislava, Slovakia
- Faculty
of Natural Sciences, Comenius University
in Bratislava, Ilkovičova
6, 842 15 Bratislava, Slovakia
| | - Daniel Truchan
- Institute
of Physics, Slovak Academy of Sciences, Dúbravská cesta 9, 845 11 Bratislava, Slovakia
- Université
Sorbonne Paris Nord, Université Paris
Cité, Laboratory for Vascular Translational Science, LVTS,
INSERM, UMR 1148, Bobigny F-93017, France
| | - Veronika Hegedűšová
- Institute
of Physics, Slovak Academy of Sciences, Dúbravská cesta 9, 845 11 Bratislava, Slovakia
- Faculty
of Natural Sciences, Comenius University
in Bratislava, Ilkovičova
6, 842 15 Bratislava, Slovakia
| | - Helena Švajdlenková
- Faculty
of Natural Sciences, Comenius University
in Bratislava, Ilkovičova
6, 842 15 Bratislava, Slovakia
- Polymer
Institute, Slovak Academy of Sciences, Dúbravská cesta 9, 845 41 Bratislava, Slovakia
| | - Matej Mičušík
- Polymer
Institute, Slovak Academy of Sciences, Dúbravská cesta 9, 845 41 Bratislava, Slovakia
| | - Mário Kotlár
- Centre
for Nanodiagnostics of Materials, Slovak
University of Technology in Bratislava, Vazovova 5, 812 43 Bratislava, Slovakia
| | - Lenka Pribusová Slušná
- Centre
for Advanced Materials Application, Slovak
Academy of Sciences, Dúbravská cesta 9, 845
11 Bratislava, Slovakia
- Institute
of Electrical Engineering, Slovak Academy of Sciences, Dúbravská cesta 9, 841 04 Bratislava, Slovakia
| | - Martin Hulman
- Institute
of Electrical Engineering, Slovak Academy of Sciences, Dúbravská cesta 9, 841 04 Bratislava, Slovakia
| | - Farnoush Salehtash
- Institute
of Physics, Slovak Academy of Sciences, Dúbravská cesta 9, 845 11 Bratislava, Slovakia
| | - Anna Kálosi
- Institute
of Physics, Slovak Academy of Sciences, Dúbravská cesta 9, 845 11 Bratislava, Slovakia
- Centre
for Advanced Materials Application, Slovak
Academy of Sciences, Dúbravská cesta 9, 845
11 Bratislava, Slovakia
| | - Lucia Csáderová
- Centre
for Advanced Materials Application, Slovak
Academy of Sciences, Dúbravská cesta 9, 845
11 Bratislava, Slovakia
- Institute
of Virology, Biomedical Research Center,
Slovak Academy of Sciences, Dúbravská cesta 9, 845 05 Bratislava, Slovakia
| | - Eliška Švastová
- Centre
for Advanced Materials Application, Slovak
Academy of Sciences, Dúbravská cesta 9, 845
11 Bratislava, Slovakia
- Institute
of Virology, Biomedical Research Center,
Slovak Academy of Sciences, Dúbravská cesta 9, 845 05 Bratislava, Slovakia
| | - Peter Šiffalovič
- Institute
of Physics, Slovak Academy of Sciences, Dúbravská cesta 9, 845 11 Bratislava, Slovakia
- Centre
for Advanced Materials Application, Slovak
Academy of Sciences, Dúbravská cesta 9, 845
11 Bratislava, Slovakia
| | - Matej Jergel
- Institute
of Physics, Slovak Academy of Sciences, Dúbravská cesta 9, 845 11 Bratislava, Slovakia
- Centre
for Advanced Materials Application, Slovak
Academy of Sciences, Dúbravská cesta 9, 845
11 Bratislava, Slovakia
| | - Silvia Pastoreková
- Institute
of Virology, Biomedical Research Center,
Slovak Academy of Sciences, Dúbravská cesta 9, 845 05 Bratislava, Slovakia
| | - Eva Majková
- Institute
of Physics, Slovak Academy of Sciences, Dúbravská cesta 9, 845 11 Bratislava, Slovakia
- Centre
for Advanced Materials Application, Slovak
Academy of Sciences, Dúbravská cesta 9, 845
11 Bratislava, Slovakia
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4
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Chou YW, Chang SY, Keng PY. Thermal Stability and Orthogonal Functionalization of Organophosphonate Self-Assembled Monolayers as Potential Liners for Cu Interconnect. ACS OMEGA 2023; 8:39699-39708. [PMID: 37901487 PMCID: PMC10601072 DOI: 10.1021/acsomega.3c05629] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/01/2023] [Accepted: 09/29/2023] [Indexed: 10/31/2023]
Abstract
In this study, we investigated the thermal stabilities of butylphosphonic acid (BPA) and aminopropyltriethoxysilane (APTES) self-assembled monolayers (SAM) on a Si substrate. The thermal desorption and the thermal cleavage of the BPA and APTES SAM film on the Si substrate were studied by X-ray photoelectron spectroscopy (XPS) upon thermal treatment from 50 to 550 °C. XPS analyses show that the onset of the thermal desorption of the APTES monolayer occurs at 250 °C and the APTES SAM completely decomposed at 400 °C. Conversely, BPA SAM on Si shows that the onset of thermal desorption occurs at 350 °C, and the BPA SAM completely desorbed at approximately 500 °C. Our study revealed that the organophosphonate SAM is a more stable SAM in modifying the dielectric sidewalls of a Cu interconnect when compared to organosilane SAM. To overcome the spontaneous reaction of the organophosphonate film on the metal substrate, a simple orthogonal functionalization method using thiolate SAM as a sacrificial layer was also demonstrated in this study.
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Affiliation(s)
- Yu-Wei Chou
- Department of Materials Science
and Engineering, National Tsing Hua University, Hsinchu 300, Taiwan
| | - Shou-Yi Chang
- Department of Materials Science
and Engineering, National Tsing Hua University, Hsinchu 300, Taiwan
| | - Pei Yuin Keng
- Department of Materials Science
and Engineering, National Tsing Hua University, Hsinchu 300, Taiwan
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5
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Bhartia B, Jayaraman S, Troadec C, Madapusi SP, Puniredd SR. Grafting of Organophosphonic Acid Monolayers on Hydrogen-Terminated Silicon Surface and Secondary Functionalization in Supercritical Carbon Dioxide Media. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2023; 39:12063-12074. [PMID: 37581455 DOI: 10.1021/acs.langmuir.3c01278] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/16/2023]
Abstract
The monolayer grafting on the oxide-free Si surface is challenging due to vulnerability of the surface against oxide formation in an ambient atmosphere. Most of the conventional studies focused on organic solvent-based chemistry and solvent and substrate interfaces, and residual solvents after the monolayer grafting play a key role in producing the highly stable monolayers. CO2 in its supercritical state (SCCO2) provides an elegant engineering solution for the problem faced as it can be used as inert processing environment and as carrier fluid for monolayer grafting taking up the role of organic solvents. In this work, monolayers of alkyl organophosphonic acids (OPAs) and functional OPAs were grafted on hydrogen-terminated oxide-free Si surfaces using the SCCO2 process. Grafted monolayers were physically and chemically characterized to verify the successful monolayer formation and determine the nature of the covalent binding configuration on the surface. To broaden the prospects of practical utility of the process and the OPA monolayer, the (3-bromopropyl)phosphonic acid (BPPA) monolayer was demonstrated to undergo secondary functionalization by terminal group substitution to convert the Br terminal group to the OH terminal group and secondary monolayer grafting to assemble 4-fluorothiophenol on top of the BPPA monolayer. The ability of monolayers to sustain secondary functionalization processing qualitatively hints toward ordered and stable monolayers of OPAs. The developed SCCO2 process in this work presents a single-step, green, and scalable method to graft the OPA monolayer on oxide-free Si which can employed in the future for monolayer doping, highly selective biochemical sensors, and targeted biological interactions.
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Affiliation(s)
- Bhavesh Bhartia
- Institute of Materials Research and Engineering, A*STAR (Agency for Science, Technology and Research), 2 Fusionopolis Way, Innovis, #08-3, Singapore 138634, Republic of Singapore
- Department of Chemical and Biomolecular Engineering, National University of Singapore,4 Engineering Drive 4, Singapore 117585, Republic of Singapore
| | - Sundaramurthy Jayaraman
- YSQ International Pte Ltd, 401 Commonwealth Drive, #07-01, Singapore 149598, Republic of Singapore
| | - Cedric Troadec
- Institute of Materials Research and Engineering, A*STAR (Agency for Science, Technology and Research), 2 Fusionopolis Way, Innovis, #08-3, Singapore 138634, Republic of Singapore
| | - Srinivasan Palavedu Madapusi
- Department of Chemical Engineering, BITS Pilani, Dubai Campus, Dubai International Academic City, P.O. Box No. 345055, Dubai 500001, UAE
| | - Sreenivasa Reddy Puniredd
- Institute of Materials Research and Engineering, A*STAR (Agency for Science, Technology and Research), 2 Fusionopolis Way, Innovis, #08-3, Singapore 138634, Republic of Singapore
- Singapore Institute of Food and Biotechnology Innovation (SIFBI), Agency for Science, Technology and Research (A*STAR), 31 Biopolis Way, Nanos, #01-02, Singapore 138669, Republic of Singapore
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6
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Rouvière L, Al-Hajj N, Hunel J, Aupetit C, Buffeteau T, Vellutini L, Genin E. Silane-Based SAMs Deposited by Spin Coating as a Versatile Alternative Process to Solution Immersion. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:6464-6471. [PMID: 35544953 DOI: 10.1021/acs.langmuir.2c00668] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Functionalization of silica surfaces with silane-based self-assembled monolayers (SAMs) is widely used in material sciences to tune surface properties and introduce terminal functional groups enabling subsequent chemical surface reactions and immobilization of (bio)molecules. Here, we report on the synthesis of four organotrimethoxysilanes with various molecular structures and we compare their grafting by spin coating with the one performed by the conventional solution immersion method. Strikingly, this study clearly demonstrates that the spin coating technique is a versatile, fast, and more convenient alternative process to prepare robust, smooth, and homogeneous SAMs with similar properties and quality as those deposited via immersion. SAMs were characterized by PM-IRRAS, AFM, and wettability measurements. SAMs can undergo several chemical surface modifications, and the reactivity of amine-terminated SAM was confirmed by PM-IRRAS and fluorescence measurements.
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Affiliation(s)
- Lisa Rouvière
- Université Bordeaux, CNRS, Bordeaux INP, ISM, UMR 5255, F-33400 Talence, France
| | - Nisreen Al-Hajj
- Université Bordeaux, CNRS, Bordeaux INP, ISM, UMR 5255, F-33400 Talence, France
- Department of Chemistry, Faculty of Science, An-Najah National University, P.O. Box 7, 400 Nablus, Palestine
| | - Julien Hunel
- Université Bordeaux, CNRS, Bordeaux INP, ISM, UMR 5255, F-33400 Talence, France
| | - Christian Aupetit
- Université Bordeaux, CNRS, Bordeaux INP, ISM, UMR 5255, F-33400 Talence, France
| | - Thierry Buffeteau
- Université Bordeaux, CNRS, Bordeaux INP, ISM, UMR 5255, F-33400 Talence, France
| | - Luc Vellutini
- Université Bordeaux, CNRS, Bordeaux INP, ISM, UMR 5255, F-33400 Talence, France
| | - Emilie Genin
- Université Bordeaux, CNRS, Bordeaux INP, ISM, UMR 5255, F-33400 Talence, France
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7
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Woo G, Lee DH, Heo Y, Kim E, On S, Kim T, Yoo H. Energy-Band Engineering by Remote Doping of Self-Assembled Monolayers Leads to High-Performance IGZO/p-Si Heterostructure Photodetectors. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2022; 34:e2107364. [PMID: 34731908 DOI: 10.1002/adma.202107364] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/15/2021] [Revised: 10/21/2021] [Indexed: 06/13/2023]
Abstract
Metal oxide semiconductors are of great interest for enabling advanced photodetectors. However, operational instability and the absence of an appropriate doping technique hinder practical development and commercialization. Here, a strategy is proposed to dramatically increase the conventional photodetection performance, having superior stability in operational and environmental atmospheres. By performing energy-band engineering through an octadecylphosphonic acid (ODPA) self-assembled-monolayer-based doping treatment, the proposed indium-gallium-zinc oxide (IGZO)/p-Si heterointerface devices exhibit greatly enhance the photoresponsive characteristics, including a photoswitching current ratio with a 100-fold increase, and photoresponsivity and detectivity with a 15-fold increase each. The observed ODPA doping effects are investigated through comprehensive analysis with X-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM), and Kelvin probe force microscopy (KPFM). Furthermore, the proposed photodetectors, fabricated at a 4 in. wafer scale, demonstrate its excellent operation robustness with consistent performance over 237 days and 20 000 testing cycles.
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Affiliation(s)
- Gunhoo Woo
- SKKU Advanced Institute of Nanotechnology, Sungkyunkwan University (SKKU), Suwon, Gyeonggi-do, 16419, Korea
| | - Dong Hyun Lee
- Department of Electronic Engineering, Gachon University, 1342 Seongnam-daero, Seongnam, 13120, Korea
| | - Yeri Heo
- Department of Electronic Engineering, Gachon University, 1342 Seongnam-daero, Seongnam, 13120, Korea
| | - Eungchul Kim
- School of Mechanical Engineering, Sungkyunkwan University, Suwon, Gyeonggi-do, 16419, Korea
| | - Sungmin On
- XFEL Accelerator Department, Pohang Accelerator Laboratory, Pohang, 37673, Korea
| | - Taesung Kim
- SKKU Advanced Institute of Nanotechnology, Sungkyunkwan University (SKKU), Suwon, Gyeonggi-do, 16419, Korea
- School of Mechanical Engineering, Sungkyunkwan University, Suwon, Gyeonggi-do, 16419, Korea
| | - Hocheon Yoo
- Department of Electronic Engineering, Gachon University, 1342 Seongnam-daero, Seongnam, 13120, Korea
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8
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Machado MVH, Rodrigues-Junior G, Malachias A. Emergence of Supramolecular Order from Combined Linear Amphiphilic and Diphosphonate Molecules. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:3685-3693. [PMID: 33720737 DOI: 10.1021/acs.langmuir.1c00075] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Self-assembled molecules exhibit key functionalities for the development of novel technologies and applications. Usually, molecular systems that exhibit long-range positional order are employed in their pure form. In this work, we observe that a combination of an amphiphilic molecule, tetradecyl-phosphonic acid (TPA), and a diphosphonate molecule with a similar length, 1,10-decyldiphosphonic acid (DdPA), induces distinct long-range ordered structures depending on the relative volume of dilutions used for drop coating. Starting from 0.2 mM diluted ethanol solutions of each molecule and combining both in distinct proportions that range from 1:20 to 20:1, we were able to identify periodic molecular structures that consist of three and five molecules of TPA and DdPA arranged in symmetries and were retrieved by synchrotron X-ray diffraction. The possibility of deterministically building up such structures can be further developed to induce surface and bulk behaviors that better suit applications such as coatings for chemical and biological studies, as well as to engineer layers used in organic electronic applications.
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Affiliation(s)
| | - Gilberto Rodrigues-Junior
- Physics Department, Federal University of Minas Gerais, Av. Antonio Carlos 6692 Belo Horizonte, Brazil
| | - Angelo Malachias
- Physics Department, Federal University of Minas Gerais, Av. Antonio Carlos 6692 Belo Horizonte, Brazil
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9
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Kennedy N, Garvey S, Maccioni B, Eaton L, Nolan M, Duffy R, Meaney F, Kennedy M, Holmes JD, Long B. Monolayer Doping of Germanium with Arsenic: A New Chemical Route to Achieve Optimal Dopant Activation. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:9993-10002. [PMID: 32787047 DOI: 10.1021/acs.langmuir.0c00408] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Reported here is a new chemical route for the wet chemical functionalization of germanium (Ge), whereby arsanilic acid is covalently bound to a chlorine (Cl)-terminated surface. This new route is used to deliver high concentrations of arsenic (As) dopants to Ge, via monolayer doping (MLD). Doping, or the introduction of Group III or Group V impurity atoms into the crystal lattice of Group IV semiconductors, is essential to allow control over the electronic properties of the material to enable transistor devices to be switched on and off. MLD is a diffusion-based method for the introduction of these impurity atoms via surface-bound molecules, which offers a nondestructive alternative to ion implantation, the current industry doping standard, making it suitable for sub-10 nm structures. Ge, given its higher carrier mobilities, is a leading candidate to replace Si as the channel material in future devices. Combining the new chemical route with the existing MLD process yields active carrier concentrations of dopants (>1 × 1019 atoms/cm3) that rival those of ion implantation. It is shown that the dose of dopant delivered to Ge is also controllable by changing the size of the precursor molecule. X-ray photoelectron spectroscopy (XPS) data and density functional theory (DFT) calculations support the formation of a covalent bond between the arsanilic acid and the Cl-terminated Ge surface. Atomic force microscopy (AFM) indicates that the integrity of the surface is maintained throughout the chemical procedure, and electrochemical capacitance voltage (ECV) data shows a carrier concentration of 1.9 × 1019 atoms/cm3 corroborated by sheet resistance measurements.
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Affiliation(s)
- Noel Kennedy
- School of Chemistry & AMBER Centre, University College Cork, Cork, T12 YN60, Ireland
| | - Shane Garvey
- School of Chemistry & AMBER Centre, University College Cork, Cork, T12 YN60, Ireland
- Tyndall National Institute, Lee Maltings, University College Cork, Cork, T12 R5CP, Ireland
| | - Barbara Maccioni
- Tyndall National Institute, Lee Maltings, University College Cork, Cork, T12 R5CP, Ireland
| | - Luke Eaton
- School of Chemistry & AMBER Centre, University College Cork, Cork, T12 YN60, Ireland
- Tyndall National Institute, Lee Maltings, University College Cork, Cork, T12 R5CP, Ireland
| | - Michael Nolan
- Tyndall National Institute, Lee Maltings, University College Cork, Cork, T12 R5CP, Ireland
| | - Ray Duffy
- Tyndall National Institute, Lee Maltings, University College Cork, Cork, T12 R5CP, Ireland
| | - Fintan Meaney
- Tyndall National Institute, Lee Maltings, University College Cork, Cork, T12 R5CP, Ireland
| | - Mary Kennedy
- Scientific Process Development Services, Tarbert, Kerry V31 X640, Ireland
| | - Justin D Holmes
- School of Chemistry & AMBER Centre, University College Cork, Cork, T12 YN60, Ireland
| | - Brenda Long
- School of Chemistry & AMBER Centre, University College Cork, Cork, T12 YN60, Ireland
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10
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Flame-retardant and Self-healing Biomass Aerogels Based on Electrostatic Assembly. CHINESE JOURNAL OF POLYMER SCIENCE 2020. [DOI: 10.1007/s10118-020-2444-4] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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11
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12
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Thermal pyrolysis investigation of self-assembled molecular monolayer for defect-free doping in silicon. Chem Phys 2020. [DOI: 10.1016/j.chemphys.2019.110658] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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13
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Chen LC, Chen KX, Zhang SY, Deng SP. Vesicle formation by ultrashort alkyl-phosphonic acids and serine in aqueous solutions. Colloids Surf B Biointerfaces 2019; 179:488-494. [PMID: 31005744 DOI: 10.1016/j.colsurfb.2019.03.055] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2018] [Revised: 03/17/2019] [Accepted: 03/25/2019] [Indexed: 12/12/2022]
Abstract
Vesicles possess unique biofilm structures and offer biomimetic advantages for drug and gene delivery. Herein, we report the spontaneous vesicle formation from ultrashort alkyl-phosphonic acids in the presence of amino acids. The aggregation characteristics and self-assembly structures of vesicles in aqueous solution were investigated by using dynamic light scattering, zeta potential, and cryo-transmission electron microscopy. We combined low-field nuclear magnetic resonance and Fourier transform infrared spectroscopy to study the H-proton-induced multilamellar vesicle formation. When we increased the molar fraction of serine, stable and closed spherical vesicles were formed at relatively low critical micelle concentrations. This transition of the self-assembled structure indicates that vesicle formation occurs when the chain length and the magnitude of the surface charge cause a fluctuation in the volume of the vesicle. Density functional theory reveals the critical role of the mixed alkyl-phosphonic acid/amino acid-enhanced electrostatic attraction between the head groups and hydrogen bonds associated with the aggregated states.
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Affiliation(s)
- Li-Chun Chen
- College of Food & Biology Engineering, Zhejiang Gongshang University, Hangzhou, Zhejiang 310035, China; Zhejiang Provincial Key Lab for Chem & Bio Processing Technology of Agricultural Products, Zhejiang University of Science and Technology, Hangzhou, Zhejiang, 310023, China
| | - Ke-Xian Chen
- College of Food & Biology Engineering, Zhejiang Gongshang University, Hangzhou, Zhejiang 310035, China
| | - Shi-Yu Zhang
- Zhejiang Provincial Key Lab for Chem & Bio Processing Technology of Agricultural Products, Zhejiang University of Science and Technology, Hangzhou, Zhejiang, 310023, China
| | - Shao-Ping Deng
- College of Food & Biology Engineering, Zhejiang Gongshang University, Hangzhou, Zhejiang 310035, China.
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14
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Straightforward Immobilization of Phosphonic Acids and Phosphoric Acid Esters on Mesoporous Silica and Their Application in an Asymmetric Aldol Reaction. NANOMATERIALS 2019; 9:nano9020249. [PMID: 30759838 PMCID: PMC6409583 DOI: 10.3390/nano9020249] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/31/2018] [Revised: 01/27/2019] [Accepted: 02/04/2019] [Indexed: 11/27/2022]
Abstract
The combined benefits of moisture-stable phosphonic acids and mesoporous silica materials (SBA-15 and MCM-41) as large-surface-area solid supports offer new opportunities for several applications, such as catalysis or drug delivery. We present a comprehensive study of a straightforward synthesis method via direct immobilization of several phosphonic acids and phosphoric acid esters on various mesoporous silicas in a Dean–Stark apparatus with toluene as the solvent. Due to the utilization of azeotropic distillation, there was no need to dry phosphonic acids, phosphoric acid esters, solvents, or silicas prior to synthesis. In addition to modeling phosphonic acids, immobilization of the important biomolecule adenosine monophosphate (AMP) on the porous supports was also investigated. Due to the high surface area of the mesoporous silicas, a possible catalytic application based on immobilization of an organocatalyst for an asymmetric aldol reaction is discussed.
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15
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Khan A, Gusain R, Khatri OP. Organophosphate anion based low viscosity ionic liquids as oil-miscible additives for lubrication enhancement. J Mol Liq 2018. [DOI: 10.1016/j.molliq.2018.09.113] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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16
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Sgarbossa F, Carturan SM, De Salvador D, Rizzi GA, Napolitani E, Maggioni G, Raniero W, Napoli DR, Granozzi G, Carnera A. Monolayer doping of germanium by phosphorus-containing molecules. NANOTECHNOLOGY 2018; 29:465702. [PMID: 30168801 DOI: 10.1088/1361-6528/aade30] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The DPP (diethyl 1-propylphosphonate) and ODPA (octadecylphosphonic acid) molecules are studied as precursors for the monolayer doping (MLD) of germanium. Their adsorption behaviour is investigated, revealing different physicochemical interactions between the phosphorus-containing molecules and the Ge surfaces. It is discovered that DPP adsorption occurs after the oxidation of Ge surface, while the ODPA undergoes chemisorption on -H terminated surfaces. Quantitative phosphorus analysis demonstrates that in the first case more than one monolayer is formed (from 2 to 4), while in the second a single monolayer is formed. Moreover, the analysis of phosphorus diffusion from the surface layers into the Ge matrix reveals that conventional thermal annealing processes are not suitable for Ge injection due to a higher activation energy of the process in comparison with silicon. On the contrary, pulsed laser melting is effective in forming a doped layer, owing to the precursor's decomposition under UV light.
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Affiliation(s)
- F Sgarbossa
- Department of Physics and Astronomy, Università degli Studi di Padova, Via Marzolo n 8, I-35131 Padova, Italy. Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Legnaro, Viale dell'Università n 2, I-35020 Legnaro (PD), Italy
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17
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Yoneda T. Reductive Dechlorination of 4-Chlorophenol in a Water-based Solvent Using Pd/SiO2 Catalysts Functionalized with Self-assembling Organophosphonic Acids. CHEM LETT 2018. [DOI: 10.1246/cl.180401] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Tetsuya Yoneda
- Department of Liberal Arts and Science, College of Science and Technology, Nihon University, 7-24-1 Narashinodai, Funabashi, Chiba 274-8501, Japan
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18
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van Druenen M, Collins G, Glynn C, O'Dwyer C, Holmes JD. Functionalization of SiO 2 Surfaces for Si Monolayer Doping with Minimal Carbon Contamination. ACS APPLIED MATERIALS & INTERFACES 2018; 10:2191-2201. [PMID: 29240397 DOI: 10.1021/acsami.7b16950] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Monolayer doping (MLD) involves the functionalization of semiconductor surfaces followed by an annealing step to diffuse the dopant into the substrate. We report an alternative doping method, oxide-MLD, where ultrathin SiO2 overlayers are functionalized with phosphonic acids for doping Si. Similar peak carrier concentrations were achieved when compared with hydrosilylated surfaces (∼2 × 1020 atoms/cm3). Oxide-MLD offers several advantages over conventional MLD, such as ease of sample processing, superior ambient stability, and minimal carbon contamination. The incorporation of an oxide layer minimizes carbon contamination by facilitating attachment of carbon-free precursors or by impeding carbon diffusion. The oxide-MLD strategy allows selection of many inexpensive precursors and therefore allows application to both p- and n-doping. The phosphonic acid-functionalized SiO2 surfaces were investigated using X-ray photoelectron spectroscopy and attenuated total reflectance Fourier transform infrared spectroscopy, whereas doping was assessed using electrochemical capacitance voltage and Hall measurements.
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Affiliation(s)
- Maart van Druenen
- School of Chemistry, and Tyndall National Institute, University College Cork , Cork, T12 YN60 Ireland
- CRANN@AMBER, Trinity College Dublin , Dublin 2, Ireland
| | - Gillian Collins
- School of Chemistry, and Tyndall National Institute, University College Cork , Cork, T12 YN60 Ireland
- CRANN@AMBER, Trinity College Dublin , Dublin 2, Ireland
| | - Colm Glynn
- School of Chemistry, and Tyndall National Institute, University College Cork , Cork, T12 YN60 Ireland
| | - Colm O'Dwyer
- School of Chemistry, and Tyndall National Institute, University College Cork , Cork, T12 YN60 Ireland
| | - Justin D Holmes
- School of Chemistry, and Tyndall National Institute, University College Cork , Cork, T12 YN60 Ireland
- CRANN@AMBER, Trinity College Dublin , Dublin 2, Ireland
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19
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Carvalho RR, Pujari SP, Gahtory D, Vrouwe EX, Albada B, Zuilhof H. Mild Photochemical Biofunctionalization of Glass Microchannels. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:8624-8631. [PMID: 28072547 DOI: 10.1021/acs.langmuir.6b03931] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The ability to locally modify the inside of microfluidic channels with bioactive molecules is of ever-rising relevance. In this article, we show the direct photochemical coupling of a N-hydroxysuccinimide-terminated ω-alkene onto hydrogen-terminated silicon oxide, and its subsequent functionalization with a catalytically active DNAzyme. To achieve this local attachment of a DNAzyme, we prepared hydrogen-phenyl-terminated glass (H-Φ-glass) by the reaction of glass with H-SiPhCl2. The presence of a radical-stabilizing substituent on the Si atom (i.e., phenyl) enabled the covalent modification of bare glass substrates and of the inside of glass microchannels with a functional organic monolayer that allowed direct reaction with an amine-functionalized biomolecule. In this study, we directly attached an NHS-functionalized alkene to the modified glass surface using light with a wavelength of 328 nm, as evidenced by SCA, G-ATR, XPS, SEM, AFM and fluorescence microscopy. Using these NHS-based active esters on the surface, we performed a direct localized attachment of a horseradish peroxidase (HRP)-mimicking hemin/G-quadruplex (hGQ) DNAzyme complex inside a microfluidic channel. This wall-coated hGQ DNAzyme effectively catalyzed the in-flow oxidation of 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulfonate) [ABTS] in the presence of hydrogen peroxide. This proof-of-concept of mild biofunctionalization will allow the facile preparation of modified microchannels for myriad biorelevant applications.
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Affiliation(s)
- Rui Rijo Carvalho
- Laboratory of Organic Chemistry, Wageningen University and Research , Stippeneng 4, 6708 WE, Wageningen, The Netherlands
- Micronit Microtechnologies B.V., Colosseum 15, 7521 PV, Enschede, The Netherlands
| | - Sidharam P Pujari
- Laboratory of Organic Chemistry, Wageningen University and Research , Stippeneng 4, 6708 WE, Wageningen, The Netherlands
| | - Digvijay Gahtory
- Laboratory of Organic Chemistry, Wageningen University and Research , Stippeneng 4, 6708 WE, Wageningen, The Netherlands
| | - Elwin X Vrouwe
- Micronit Microtechnologies B.V., Colosseum 15, 7521 PV, Enschede, The Netherlands
| | - Bauke Albada
- Laboratory of Organic Chemistry, Wageningen University and Research , Stippeneng 4, 6708 WE, Wageningen, The Netherlands
| | - Han Zuilhof
- Laboratory of Organic Chemistry, Wageningen University and Research , Stippeneng 4, 6708 WE, Wageningen, The Netherlands
- School of Pharmaceutical Sciences and Technology, Tianjin University , 92 Weijin Road, Tianjin, P.R. China
- Department of Chemical and Materials Engineering, King Abdulaziz University , Jeddah, Saudi Arabia
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20
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Lee AWH, Gates BD. Covalent Surface Modification of Silicon Oxides with Alcohols in Polar Aprotic Solvents. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:8707-8715. [PMID: 28556659 DOI: 10.1021/acs.langmuir.7b00820] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Alcohol-based monolayers were successfully formed on the surfaces of silicon oxides through reactions performed in polar aprotic solvents. Monolayers prepared from alcohol-based reagents have been previously introduced as an alternative approach to covalently modify the surfaces of silicon oxides. These reagents are readily available, widely distributed, and are minimally susceptible to side reactions with ambient moisture. A limitation of using alcohol-based compounds is that previous reactions required relatively high temperatures in neat solutions, which can degrade some alcohol compounds or could lead to other unwanted side reactions during the formation of the monolayers. To overcome these challenges, we investigate the condensation reaction of alcohols on silicon oxides carried out in polar aprotic solvents. In particular, propylene carbonate has been identified as a polar aprotic solvent that is relatively nontoxic, readily accessible, and can facilitate the formation of alcohol-based monolayers. We have successfully demonstrated this approach for tuning the surface chemistry of silicon oxide surfaces with a variety of alcohol containing compounds. The strategy introduced in this research can be utilized to create silicon oxide surfaces with hydrophobic, oleophobic, or charged functionalities.
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Affiliation(s)
- Austin W H Lee
- Department of Chemistry, Simon Fraser University , 8888 University Drive, Burnaby, British Columbia V5A 1S6, Canada
| | - Byron D Gates
- Department of Chemistry, Simon Fraser University , 8888 University Drive, Burnaby, British Columbia V5A 1S6, Canada
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21
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Cattani-Scholz A. Functional Organophosphonate Interfaces for Nanotechnology: A Review. ACS APPLIED MATERIALS & INTERFACES 2017; 9:25643-25655. [PMID: 28671811 DOI: 10.1021/acsami.7b04382] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Optimization of interfaces in inorganic-organic device systems depends strongly on understanding both the molecular processes that are involved in surface modification and the effects that such modifications have on the electronic states of the material. In particular, the last several years have seen passivation and functionalization of semiconductor surfaces to be strategies by which to realize devices with superior function by controlling Fermi level energies, band-gap magnitudes, and work functions of semiconducting substrates. Among all of the synthetic routes and deposition methods available for the optimization of functional interfaces in hybrid systems, organophosphonate chemistry has been found to be a powerful tool to control at the molecular level the properties of materials in many different applications. In this Review, we focus on the relevance of organophosphonate chemistry in nanotechnology, giving an overview about some recent advances in surface modification, interface engineering, nanostructure optimization, and biointegration.
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Affiliation(s)
- Anna Cattani-Scholz
- Walter Schottky Institut and Technische Universität München , 85748 Garching, Germany
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22
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Pizzoccaro MA, Drobek M, Petit E, Guerrero G, Hesemann P, Julbe A. Design of Phosphonated Imidazolium-Based Ionic Liquids Grafted on γ-Alumina: Potential Model for Hybrid Membranes. Int J Mol Sci 2016; 17:ijms17081212. [PMID: 27472321 PMCID: PMC5000610 DOI: 10.3390/ijms17081212] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2016] [Revised: 07/08/2016] [Accepted: 07/20/2016] [Indexed: 11/16/2022] Open
Abstract
Imidazolium bromide-based ionic liquids bearing phosphonyl groups on the cationic part were synthesized and grafted on γ-alumina (γ-Al₂O₃) powders. These powders were prepared as companion samples of conventional mesoporous γ-alumina membranes, in order to favor a possible transfer of the results to supported membrane materials, which could be used for CO₂ separation applications. Effective grafting was demonstrated using energy dispersive X-ray spectrometry (EDX), N₂ adsorption measurements, fourier transform infrared spectroscopy (FTIR), and special attention was paid to (31)P and (13)C solid state nuclear magnetic resonance spectroscopy (NMR).
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Affiliation(s)
- Marie-Alix Pizzoccaro
- Institut Européen des Membranes, UMR-5635 CNRS-UM-ENSCM, Université de Montpellier (CC047), Place Eugène Bataillon, F-34095 Montpellier cedex 5, France.
| | - Martin Drobek
- Institut Européen des Membranes, UMR-5635 CNRS-UM-ENSCM, Université de Montpellier (CC047), Place Eugène Bataillon, F-34095 Montpellier cedex 5, France.
| | - Eddy Petit
- Institut Européen des Membranes, UMR-5635 CNRS-UM-ENSCM, Université de Montpellier (CC047), Place Eugène Bataillon, F-34095 Montpellier cedex 5, France.
| | - Gilles Guerrero
- Institut Charles Gerhardt, UMR-5253 CNRS-UM-ENSCM, Université de Montpellier (CC1701), Place Eugène Bataillon, F-34095 Montpellier cedex 5, France.
| | - Peter Hesemann
- Institut Charles Gerhardt, UMR-5253 CNRS-UM-ENSCM, Université de Montpellier (CC1701), Place Eugène Bataillon, F-34095 Montpellier cedex 5, France.
| | - Anne Julbe
- Institut Européen des Membranes, UMR-5635 CNRS-UM-ENSCM, Université de Montpellier (CC047), Place Eugène Bataillon, F-34095 Montpellier cedex 5, France.
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23
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Lee AWH, Gates BD. Rapid Covalent Modification of Silicon Oxide Surfaces through Microwave-Assisted Reactions with Alcohols. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:7284-7293. [PMID: 27396288 DOI: 10.1021/acs.langmuir.6b00662] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We demonstrate the method of a rapid covalent modification of silicon oxide surfaces with alcohol-containing compounds with assistance by microwave reactions. Alcohol-containing compounds are prevalent reagents in the laboratory, which are also relatively easy to handle because of their stability against exposure to atmospheric moisture. The condensation of these alcohols with the surfaces of silicon oxides is often hindered by slow reaction kinetics. Microwave radiation effectively accelerates this condensation reaction by heating the substrates and/or solvents. A variety of substrates were modified in this demonstration, such as silicon oxide films of various thicknesses, glass substrates such as microscope slides (soda lime), and quartz. The monolayers prepared through this strategy demonstrated the successful formation of covalent surface modifications of silicon oxides with water contact angles of up to 110° and typical hysteresis values of 2° or less. An evaluation of the hydrolytic stability of these monolayers demonstrated their excellent stability under acidic conditions. The techniques introduced in this article were successfully applied to tune the surface chemistry of silicon oxides to achieve hydrophobic, oleophobic, and/or charged surfaces.
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Affiliation(s)
- Austin W H Lee
- Department of Chemistry, Simon Fraser University , 8888 University Drive, Burnaby, British Columbia V5A 1S6, Canada
| | - Byron D Gates
- Department of Chemistry, Simon Fraser University , 8888 University Drive, Burnaby, British Columbia V5A 1S6, Canada
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24
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Córdoba A, Hierro-Oliva M, Pacha-Olivenza MÁ, Fernández-Calderón MC, Perelló J, Isern B, González-Martín ML, Monjo M, Ramis JM. Direct Covalent Grafting of Phytate to Titanium Surfaces through Ti-O-P Bonding Shows Bone Stimulating Surface Properties and Decreased Bacterial Adhesion. ACS APPLIED MATERIALS & INTERFACES 2016; 8:11326-11335. [PMID: 27088315 DOI: 10.1021/acsami.6b02533] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Myo-inositol hexaphosphate, also called phytic acid or phytate (IP6), is a natural molecule abundant in vegetable seeds and legumes. Among other functions, IP6 inhibits bone resorption. It is adsorbed on the surface of hydroxyapatite, inhibiting its dissolution and decreasing the progressive loss of bone mass. We present here a method to directly functionalize Ti surfaces covalently with IP6, without using a cross-linker molecule, through the reaction of the phosphate groups of IP6 with the TiO2 layer of Ti substrates. The grafting reaction consisted of an immersion in an IP6 solution to allow the physisorption of the molecules onto the substrate, followed by a heating step to obtain its chemisorption, in an adaptation of the T-Bag method. The reaction was highly dependent on the IP6 solution pH, only achieving a covalent Ti-O-P bond at pH 0. We evaluated two acidic pretreatments of the Ti surface, to increase its hydroxylic content, HNO3 30% and HF 0.2%. The structure of the coated surfaces was characterized by X-ray photoelectron spectroscopy, time-of-flight secondary ion mass spectrometry, and ellipsometry. The stability of the IP6 coating after three months of storage and after sterilization with γ-irradiation was also determined. Then, we evaluated the biological effect of Ti-IP6 surfaces in vitro on MC3T3-E1 osteoblastic cells, showing an osteogenic effect. Finally, the effect of the surfaces on the adhesion and biofilm viability of oral microorganisms S. mutans and S. sanguinis was also studied, and we found that Ti-IP6 surfaces decreased the adhesion of S. sanguinis. A surface that actively improves osseointegration while decreasing the bacterial adhesion could be suitable for use in bone implants.
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Affiliation(s)
- Alba Córdoba
- Group of Cell Therapy and Tissue Engineering, Research Institute on Health Sciences (IUNICS), University of Balearic Islands , Ctra. Valldemossa km 7.5, 07122 Palma de Mallorca, Spain
- Instituto de Investigación Sanitaria de Palma , 07010 Palma, España
| | - Margarita Hierro-Oliva
- Departamento de Física Aplicada, Facultad de Ciencias, Universidad de Extremadura , Badajoz, Spain
- Biomedical Research Networking Center in Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN) , Madrid, Spain
| | - Miguel Ángel Pacha-Olivenza
- Departamento de Física Aplicada, Facultad de Ciencias, Universidad de Extremadura , Badajoz, Spain
- Biomedical Research Networking Center in Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN) , Madrid, Spain
| | - María Coronada Fernández-Calderón
- Departamento de Física Aplicada, Facultad de Ciencias, Universidad de Extremadura , Badajoz, Spain
- Biomedical Research Networking Center in Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN) , Madrid, Spain
| | - Joan Perelló
- Laboratoris Sanifit , ParcBIT, Palma de Mallorca, Spain
| | - Bernat Isern
- Laboratoris Sanifit , ParcBIT, Palma de Mallorca, Spain
| | - María Luisa González-Martín
- Departamento de Física Aplicada, Facultad de Ciencias, Universidad de Extremadura , Badajoz, Spain
- Biomedical Research Networking Center in Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN) , Madrid, Spain
| | - Marta Monjo
- Group of Cell Therapy and Tissue Engineering, Research Institute on Health Sciences (IUNICS), University of Balearic Islands , Ctra. Valldemossa km 7.5, 07122 Palma de Mallorca, Spain
- Instituto de Investigación Sanitaria de Palma , 07010 Palma, España
| | - Joana M Ramis
- Group of Cell Therapy and Tissue Engineering, Research Institute on Health Sciences (IUNICS), University of Balearic Islands , Ctra. Valldemossa km 7.5, 07122 Palma de Mallorca, Spain
- Instituto de Investigación Sanitaria de Palma , 07010 Palma, España
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25
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Carvalho RR, Pujari SP, Lange SC, Sen R, Vrouwe EX, Zuilhof H. Local Light-Induced Modification of the Inside of Microfluidic Glass Chips. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:2389-2398. [PMID: 26976049 DOI: 10.1021/acs.langmuir.5b04621] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The ability to locally functionalize the surface of glass allows for myriad biomedical and chemical applications. This would be the case if the surface functionalization can be induced using light with wavelengths for which standard glass is almost transparent. To this aim, we present the first example of a photochemical modification of hydrogen-terminated glass (H-glass) with terminal alkenes. Both flat glass surfaces and the inside of glass microchannels were modified with a well-defined, covalently attached organic monolayer using a range of wavelengths, including sub-band-gap 302 nm ultraviolet light. A detailed characterization thereof was conducted by measurements of the static water contact angle, X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), and scanning Auger microscopy (SAM). Germanium attenuated total reflection Fourier transform infrared (GATR-FTIR) indicates that the mechanism of the surface modification proceeds via an anti-Markovnikov substitution. Reacting H-glass with 10-trifluoro-acetamide-1-decene (TFAAD) followed by basic hydrolysis affords the corresponding primary amine-terminated monolayer, enabling additional functionalization of the substrate. Furthermore, we show the successful formation of a photopatterned amine layer by the specific attachment of fluorescent nanoparticles in very discrete regions. Finally, a microchannel was photochemically patterned with a functional linker allowing for surface-directed liquid flow. These results demonstrate that H-glass can be modified with a functional tailor-made organic monolayer, has highly tunable wetting properties, and displays significant potential for further applications.
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Affiliation(s)
- Rui Rijo Carvalho
- Laboratory of Organic Chemistry, Wageningen University , Dreijenplein 8, 6703 HB Wageningen, The Netherlands
- Micronit Microfluidics B.V., Colosseum 15, 7521 PV Enschede, The Netherlands
| | - Sidharam P Pujari
- Laboratory of Organic Chemistry, Wageningen University , Dreijenplein 8, 6703 HB Wageningen, The Netherlands
| | - Stefanie C Lange
- Laboratory of Organic Chemistry, Wageningen University , Dreijenplein 8, 6703 HB Wageningen, The Netherlands
| | - Rickdeb Sen
- Laboratory of Organic Chemistry, Wageningen University , Dreijenplein 8, 6703 HB Wageningen, The Netherlands
| | - Elwin Xander Vrouwe
- Micronit Microfluidics B.V., Colosseum 15, 7521 PV Enschede, The Netherlands
| | - Han Zuilhof
- Laboratory of Organic Chemistry, Wageningen University , Dreijenplein 8, 6703 HB Wageningen, The Netherlands
- Department of Chemical and Materials Engineering, King Abdulaziz University , Jeddah, Saudi Arabia
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26
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Liu LH, Michalak DJ, Chopra TP, Pujari SP, Cabrera W, Dick D, Veyan JF, Hourani R, Halls MD, Zuilhof H, Chabal YJ. Surface etching, chemical modification and characterization of silicon nitride and silicon oxide--selective functionalization of Si3N4 and SiO2. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2016; 28:094014. [PMID: 26870908 DOI: 10.1088/0953-8984/28/9/094014] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The ability to selectively chemically functionalize silicon nitride (Si3N4) or silicon dioxide (SiO2) surfaces after cleaning would open interesting technological applications. In order to achieve this goal, the chemical composition of surfaces needs to be carefully characterized so that target chemical reactions can proceed on only one surface at a time. While wet-chemically cleaned silicon dioxide surfaces have been shown to be terminated with surficial Si-OH sites, chemical composition of the HF-etched silicon nitride surfaces is more controversial. In this work, we removed the native oxide under various aqueous HF-etching conditions and studied the chemical nature of the resulting Si3N4 surfaces using infrared absorption spectroscopy (IRAS), x-ray photoelectron spectroscopy (XPS), low energy ion scattering (LEIS), and contact angle measurements. We find that HF-etched silicon nitride surfaces are terminated by surficial Si-F and Si-OH bonds, with slightly subsurface Si-OH, Si-O-Si, and Si-NH2 groups. The concentration of surficial Si-F sites is not dependent on HF concentration, but the distribution of oxygen and Si-NH2 displays a weak dependence. The Si-OH groups of the etched nitride surface are shown to react in a similar manner to the Si-OH sites on SiO2, and therefore no selectivity was found. Chemical selectivity was, however, demonstrated by first reacting the -NH2 groups on the etched nitride surface with aldehyde molecules, which do not react with the Si-OH sites on a SiO2 surface, and then using trichloro-organosilanes for selective reaction only on the SiO2 surface (no reactivity on the aldehyde-terminated Si3N4 surface).
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Affiliation(s)
- Li-Hong Liu
- Department of Materials Science and Engineering, University of Texas at Dallas, Richardson, TX 75080, USA
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27
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Son JG, Choi E, Piao Y, Han SW, Lee TG. Probing organic ligands and their binding schemes on nanocrystals by mass spectrometric and FT-IR spectroscopic imaging. NANOSCALE 2016; 8:4573-4578. [PMID: 26842618 DOI: 10.1039/c5nr07592k] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
We report an analysis method to identify conjugated ligands and their binding states on semiconductor nanocrystals based on their molecular information. Surface science techniques, such as time-of-flight secondary-ion mass spectrometry (ToF-SIMS) and FT-IR spectroscopy, are adopted based on the micro-aggregated sampling method. Typical trioctylphosphine oxide-based synthesis methods of CdSe/ZnS quantum dots (QDs) have been criticized because of the peculiar effects of impurities on the synthesis processes. Because the ToF-SIMS technique provides molecular composition evidence on the existence of certain ligands, we were able to clearly identify n-octylphosphonic acid (OPA) as a surface ligand on CdSe/ZnS QDs. Furthermore, the complementary use of the ToF-SIMS technique with the FT-IR technique could reveal the OPA ligands' binding state as bidentate complexes.
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Affiliation(s)
- Jin Gyeong Son
- Department of Chemistry and KI for the NanoCentury, KAIST, Daejeon 34141, Korea. and Center for Nano-Bio Measurement, Korea Research Institute of Standard and Science, Daejeon 34113, Korea.
| | - Eunjin Choi
- Program in Nano Science and Technology, Department of Transdisciplinary Studies, Graduate School of Convergence Science and Technology, Seoul National University, Seoul 08826, Korea and Advanced Institute of Convergence Technology, Suwon 16227, Korea
| | - Yuanzhe Piao
- Program in Nano Science and Technology, Department of Transdisciplinary Studies, Graduate School of Convergence Science and Technology, Seoul National University, Seoul 08826, Korea and Advanced Institute of Convergence Technology, Suwon 16227, Korea
| | - Sang Woo Han
- Department of Chemistry and KI for the NanoCentury, KAIST, Daejeon 34141, Korea.
| | - Tae Geol Lee
- Center for Nano-Bio Measurement, Korea Research Institute of Standard and Science, Daejeon 34113, Korea.
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28
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Styskalik A, Skoda D, Moravec Z, Barnes CE, Pinkas J. Surface reactivity of non-hydrolytic silicophosphate xerogels: a simple method to create Brønsted or Lewis acid sites on porous supports. NEW J CHEM 2016. [DOI: 10.1039/c5nj02928g] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The reactivity of residual acetoxy and trimethylsilyloxy groups is studied in order to introduce new moieties into the surface of silicophosphates.
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Affiliation(s)
- Ales Styskalik
- Department of Chemistry
- Masaryk University
- CZ-61137 Brno
- Czech Republic
- Masaryk University
| | - David Skoda
- Department of Chemistry
- Masaryk University
- CZ-61137 Brno
- Czech Republic
- Masaryk University
| | - Zdenek Moravec
- Department of Chemistry
- Masaryk University
- CZ-61137 Brno
- Czech Republic
| | | | - Jiri Pinkas
- Department of Chemistry
- Masaryk University
- CZ-61137 Brno
- Czech Republic
- Masaryk University
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29
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Bhartia B, Bacher N, Jayaraman S, Khatib S, Song J, Guo S, Troadec C, Puniredd SR, Srinivasan MP, Haick H. Application of Organophosphonic Acids by One-Step Supercritical CO2 on 1D and 2D Semiconductors: Toward Enhanced Electrical and Sensing Performances. ACS APPLIED MATERIALS & INTERFACES 2015; 7:14885-14895. [PMID: 26087766 DOI: 10.1021/acsami.5b03597] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Formation of dense monolayers with proven atmospheric stability using simple fabrication conditions remains a major challenge for potential applications such as (bio)sensors, solar cells, surfaces for growth of biological cells, and molecular, organic, and plastic electronics. Here, we demonstrate a single-step modification of organophosphonic acids (OPA) on 1D and 2D structures using supercritical carbon dioxide (SCCO2) as a processing medium, with high stability and significantly shorter processing times than those obtained by the conventional physisorption-chemisorption method (2.5 h vs 48-60 h).The advantages of this approach in terms of stability and atmospheric resistivity are demonstrated on various 2D materials, such as indium-tin-oxide (ITO) and 2D Si surfaces. The advantage of the reported approach on electronic and sensing devices is demonstrated by Si nanowire field effect transistors (SiNW FETs), which have shown a few orders of magnitude higher electrical and sensing performances, compared with devices obtained by conventional approaches. The compatibility of the reported approach with various materials and its simple implementation with a single reactor makes it easily scalable for various applications.
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Affiliation(s)
- Bhavesh Bhartia
- ‡Department of Chemical and Biomolecular Engineering, National University of Singapore,4 Engineering Drive 4, Singapore 117585, Singapore
| | - Nadav Bacher
- §The Department of Chemical Engineering and Russell Berrie Nanotechnology Institute, Technion-Israel Institute of Technology, Haifa 3200003, Israel
| | - Sundaramurthy Jayaraman
- ⊥Environmental and Water Technology Centre of Innovation, Ngee Ann Polytechnic, 535 Clementi Rd, Singapore599489, Singapore
| | - Salam Khatib
- §The Department of Chemical Engineering and Russell Berrie Nanotechnology Institute, Technion-Israel Institute of Technology, Haifa 3200003, Israel
| | - Jing Song
- ∥Institute of Materials Research and Engineering, A*STAR (Agency for Science, Technology and Research), 3 Research Link, Singapore 117602, Singapore
| | - Shifeng Guo
- ∥Institute of Materials Research and Engineering, A*STAR (Agency for Science, Technology and Research), 3 Research Link, Singapore 117602, Singapore
| | - Cedric Troadec
- ∥Institute of Materials Research and Engineering, A*STAR (Agency for Science, Technology and Research), 3 Research Link, Singapore 117602, Singapore
| | - Sreenivasa Reddy Puniredd
- ∥Institute of Materials Research and Engineering, A*STAR (Agency for Science, Technology and Research), 3 Research Link, Singapore 117602, Singapore
| | - Madapusi Palavedu Srinivasan
- ‡Department of Chemical and Biomolecular Engineering, National University of Singapore,4 Engineering Drive 4, Singapore 117585, Singapore
| | - Hossam Haick
- §The Department of Chemical Engineering and Russell Berrie Nanotechnology Institute, Technion-Israel Institute of Technology, Haifa 3200003, Israel
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30
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Forget A, Limoges B, Balland V. Efficient chemisorption of organophosphorous redox probes on indium tin oxide surfaces under mild conditions. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:1931-1940. [PMID: 25611977 DOI: 10.1021/la503760x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We report a mild and straightforward one-step chemical surface functionalization of indium tin oxide (ITO) electrodes by redox-active molecules bearing an organophosphoryl anchoring group (i.e., alkyl phosphate or alkyl phosphonate group). The method takes advantage of simple passive adsorption in an aqueous solution at room temperature. We show that organophosphorus compounds can adsorb much more strongly and stably on an ITO surface than analogous redox-active molecules bearing a carboxylate or a boronate moiety. We provide evidence, through quantitative electrochemical characterization (i.e., by cyclic voltammetry) of the adsorbed organophosphoryl redox-active molecules, of the occurrence of three different adsorbate fractions on ITO, exhibiting different stabilities on the surface. Among these three fractions, one is observed to be strongly chemisorbed, exhibiting high stability and resistance to desorption/hydrolysis in a free-redox probe aqueous buffer. We attribute this remarkable stability to the formation of chemical bonds between the organophosphorus anchoring group and the metal oxide surface, likely occurring through a heterocondensation reaction in water. From XPS analysis, we also demonstrate that the surface coverage of the chemisorbed molecules is highly affected by the degree of surface hydroxylation, a parameter that can be tuned by simply preconditioning the freshly cleaned ITO surfaces in water. The lower the relative surface hydroxide density on ITO, the higher was the surface coverage of the chemisorbed species. This behavior is in line with a chemisorption mechanism involving coordination of a deprotonated phosphoryl oxygen atom to the non-hydroxylated acidic metal sites of ITO.
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Affiliation(s)
- Amélie Forget
- Laboratoire d'Electrochimie Moléculaire, UMR CNRS 7591, Université Paris Diderot , Sorbonne Paris Cité, 15 rue Jean-Antoine de Baïf, F-75205 Paris, Cedex 13, France
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31
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Boissezon R, Muller J, Beaugeard V, Monge S, Robin JJ. Organophosphonates as anchoring agents onto metal oxide-based materials: synthesis and applications. RSC Adv 2014. [DOI: 10.1039/c4ra05414h] [Citation(s) in RCA: 65] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
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32
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Pujari SP, Scheres L, Marcelis ATM, Zuilhof H. Covalent Surface Modification of Oxide Surfaces. Angew Chem Int Ed Engl 2014; 53:6322-56. [DOI: 10.1002/anie.201306709] [Citation(s) in RCA: 583] [Impact Index Per Article: 58.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2013] [Indexed: 12/26/2022]
Affiliation(s)
- Sidharam P. Pujari
- Laboratory of Organic Chemistry, Wageningen University, P.O. Box 26, 6703 HB Wageningen (The Netherlands)
| | - Luc Scheres
- Surfix B.V. Dreijenplein 8, 6703 HB Wageningen (The Netherlands)
| | - Antonius T. M. Marcelis
- Laboratory of Organic Chemistry, Wageningen University, P.O. Box 26, 6703 HB Wageningen (The Netherlands)
| | - Han Zuilhof
- Laboratory of Organic Chemistry, Wageningen University, P.O. Box 26, 6703 HB Wageningen (The Netherlands)
- Department of Chemical and Materials Engineering, King Abdulaziz University, Jeddah (Saudi Arabia)
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33
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Pujari SP, Scheres L, Marcelis ATM, Zuilhof H. Kovalente Oberflächenmodifikationen von Oxiden. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201306709] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Affiliation(s)
- Sidharam P. Pujari
- Laboratory of Organic Chemistry, Wageningen University, P.O. Box 26, 6703 HB Wageningen (Niederlande)
| | | | - Antonius T. M. Marcelis
- Laboratory of Organic Chemistry, Wageningen University, P.O. Box 26, 6703 HB Wageningen (Niederlande)
| | - Han Zuilhof
- Laboratory of Organic Chemistry, Wageningen University, P.O. Box 26, 6703 HB Wageningen (Niederlande)
- Department of Chemical and Materials Engineering, King Abdulaziz University, Jeddah (Saudi‐Arabien)
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34
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Debrassi A, Ribbera A, de Vos WM, Wennekes T, Zuilhof H. Stability of (bio)functionalized porous aluminum oxide. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:1311-1320. [PMID: 24471580 DOI: 10.1021/la403525z] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Porous aluminum oxide (PAO), a nanostructured support for, among others, culturing microorganisms, was chemically modified in order to attach biomolecules that can selectively interact with target bacteria. We present the first comprehensive study of monolayer-modified PAO using conditions that are relevant to microbial growth with a range of functional groups (carboxylic acid, α-hydroxycarboxylic acid, alkyne, alkene, phosphonic acid, and silane). Their stability was initially assessed in phosphate-buffered saline (pH 7.0) at room temperature. The most stable combination (PAO with phosphonic acids) was further studied over a range of physiological pHs (4-8) and temperatures (up to 80 °C). Varying the pH had no significant effect on the stability, but it gradually decreased with increasing temperature. The stability of phosphonic acid-modified PAO surfaces was shown to depend strongly on the other terminal group of the monolayer structure: in general, hydrophilic monolayers were less stable than hydrophobic monolayers. Finally, an alkyne-terminated PAO surface was reacted with an azide-linked mannose derivative. The resulting mannose-presenting PAO surface showed the clearly increased adherence of a mannose-binding bacterium, Lactobacillus plantarum, and also allowed for bacterial outgrowth.
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Affiliation(s)
- Aline Debrassi
- Laboratory of Organic Chemistry, Wageningen University , Dreijenplein 8, 6703 HB Wageningen, The Netherlands
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35
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Pujari SP, Li Y, Regeling R, Zuilhof H. Tribology and stability of organic monolayers on CrN: a comparison among silane, phosphonate, alkene, and alkyne chemistries. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:10405-10415. [PMID: 23924242 DOI: 10.1021/la401981b] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
The fabrication of chemically and mechanically stable monolayers on the surfaces of various inorganic hard materials is crucial to the development of biomedical/electronic devices. In this Article, monolayers based on the reactivity of silane, phosphonate, 1-alkene, and 1-alkyne moieties were obtained on the hydroxyl-terminated chromium nitride surface. Their chemical stability and tribology were systematically investigated. The chemical stability of the modified CrN surfaces was tested in aqueous media at 60 °C at pH 3, 7, and 11 and monitored by static water contact angle measurements, X-ray photoelectron spectroscopy (XPS), ellipsometry, and Fourier transform infrared reflection absorption spectroscopy (FT-IRRAS). The tribological properties of the resulting organic monolayers with different end groups (fluorinated or nonfluorinated) were studied using atomic force microscopy (AFM). It was found that the fluorinated monolayers exhibit a dramatic reduction of adhesion and friction force as well as excellent wear resistance compared to those of nonfluorinated coatings and bare CrN substrates. The combination of remarkable chemical stability and superior tribological properties makes these fluorinated monolayers promising candidates for the development of robust high-performance devices.
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Affiliation(s)
- Sidharam P Pujari
- Laboratory of Organic Chemistry, Wageningen University, Dreijenplein 8, 6703 HB Wageningen, The Netherlands
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36
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Guerrero G, Alauzun JG, Granier M, Laurencin D, Mutin PH. Phosphonate coupling molecules for the control of surface/interface properties and the synthesis of nanomaterials. Dalton Trans 2013; 42:12569-85. [DOI: 10.1039/c3dt51193f] [Citation(s) in RCA: 172] [Impact Index Per Article: 15.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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37
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Thissen P, Vega A, Peixoto T, Chabal YJ. Controlled, low-coverage metal oxide activation of silicon for organic functionalization: unraveling the phosphonate bond. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:17494-17505. [PMID: 23163566 DOI: 10.1021/la3038457] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Deposition of thin films and grafting of organic molecules on semiconductor surfaces, particularly oxide surfaces, are widely studied as means of passivation and functionalization for a variety of applications. However, organic functionalization of silicon oxide is challenging, as the currently used molecules (silanes and phosphonates) do not form layers that are stable in aqueous environments and present challenges during the grafting process. For instance, the chemical grafting of phosphonates requires high temperature (140 °C) to perform. Modification of SiO(2) surfaces with metal oxides is an attractive alternative since strong bonds can be established between metal oxides and relevant molecules (silanes, phosphonates). While such modification is possible using vapor-phase methods, such as atomic layer deposition and physical vapor-phase deposition, wet chemical processing is inexpensive and technologically very attractive. We describe here a simple wet chemical method to deposit an ultrathin layer of metal oxide/hydroxide groups. Further, using a model surface with exactly one-third monolayer OH groups on oxide-free Si surfaces, the precise adsorption geometry on single Al(OH)(3) groups is shown to be bidentate, and the distance between the Al and P atoms is determined to be the main influencing parameter for a thermodynamically stable formation of the Al-O-P bond.
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Affiliation(s)
- Peter Thissen
- Department of Materials Science and Engineering, University of Texas at Dallas, 800 West Campbell Road, Richardson, Texas 75080, United States.
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