1
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Supercritical fluid immobilization of horseradish peroxidase on high surface area mesoporous activated carbon. J Supercrit Fluids 2016. [DOI: 10.1016/j.supflu.2015.06.026] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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2
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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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3
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Deposition of zwitterionic polymer brushes in a dense gas medium. J Colloid Interface Sci 2015; 448:156-62. [DOI: 10.1016/j.jcis.2015.01.070] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2015] [Accepted: 01/27/2015] [Indexed: 11/17/2022]
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4
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Jin T, Kong FM. Effect of differently terminal groups of poly(amido-amine) dendrimers on dispersion stability of nano-silica and ab initio calculations. SURF INTERFACE ANAL 2015. [DOI: 10.1002/sia.5735] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Tao Jin
- College of Material Science and Engineering; Shandong University of Science and Technology; Qingdao 266590 China
| | - Fan-mei Kong
- College of Earth Science and Engineering; Shandong University of Science and Technology; Qingdao 266590 China
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5
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Wang Y, An Q, Zhou Y, Niu Y, Akram R, Zhang Y, Shi F. Post-infiltration and subsequent photo-crosslinking strategy for layer-by-layer fabrication of stable dendrimers enabling repeated loading and release of hydrophobic molecules. J Mater Chem B 2015; 3:562-569. [DOI: 10.1039/c4tb01688b] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We developed a method that simultaneously utilize covalent interlayer linkages and drug reservoirs to construct LbL multilayers which can repeatedly load and slow release model drugs.
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Affiliation(s)
- Yue Wang
- State Key Laboratory of Chemical Resource Engineering & Key Laboratory of Carbon Fiber and Functional Polymer
- Ministry of Education
- Beijing University of Chemical Technology
- Beijing 100029
- China
| | - Qi An
- School of Materials Science and Technology
- China University of Geoscience (Beijing)
- Beijing 100083
- China
| | - Yong Zhou
- State Key Laboratory of Chemical Resource Engineering & Key Laboratory of Carbon Fiber and Functional Polymer
- Ministry of Education
- Beijing University of Chemical Technology
- Beijing 100029
- China
| | - Yue Niu
- State Key Laboratory of Chemical Resource Engineering & Key Laboratory of Carbon Fiber and Functional Polymer
- Ministry of Education
- Beijing University of Chemical Technology
- Beijing 100029
- China
| | - Raheel Akram
- State Key Laboratory of Chemical Resource Engineering & Key Laboratory of Carbon Fiber and Functional Polymer
- Ministry of Education
- Beijing University of Chemical Technology
- Beijing 100029
- China
| | - Yihe Zhang
- School of Materials Science and Technology
- China University of Geoscience (Beijing)
- Beijing 100083
- China
| | - Feng Shi
- State Key Laboratory of Chemical Resource Engineering & Key Laboratory of Carbon Fiber and Functional Polymer
- Ministry of Education
- Beijing University of Chemical Technology
- Beijing 100029
- China
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6
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Zhou R, Srinivasan MP. In situ synthesis and immobilization of metallic nanoparticles on a calixarene monolayer. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:13042-13049. [PMID: 24093762 DOI: 10.1021/la401751d] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
A covalently immobilized calix[7]hydroquinone monolayer was used as the host matrix to synthesize metallic NPs using an in situ redox process. The characteristics of different metallic ions that affect the synthesis process were studied. Metallic ions with less charges, lower oxidation state in the reaction, and higher standard redox potential provided better yield. Bimetallic NPs with a core-shell structure were synthesized by a sequential deposition of different metals on the same monolayer. The process was applied to form a layer of immobilized NPs on flat and curved surfaces. The ability to synthesize and immobilize well-controlled NPs on different surfaces has promising applications in decoration of irregular surfaces of miniaturized, three-dimensional objects.
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Affiliation(s)
- Ruitao Zhou
- Chemical and Biomolecular Engineering, National University of Singapore , Singapore 117576, Singapore
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7
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Puniredd SR, Jayaraman S, Yeong SH, Troadec C, Srinivasan MP. Stable Organic Monolayers on Oxide-Free Silicon/Germanium in a Supercritical Medium: A New Route to Molecular Electronics. J Phys Chem Lett 2013; 4:1397-1403. [PMID: 26282291 DOI: 10.1021/jz4005416] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Oxide-free Si and Ge surfaces have been passivated and modified with organic molecules by forming covalent bonds between the surfaces and reactive end groups of linear alkanes and aromatic species using single-step deposition in supercritical carbon dioxide (SCCO2). The process is suitable for large-scale manufacturing due to short processing times, simplicity, and high resistance to oxidation. It also allows the formation of monolayers with varying reactive terminal groups, thus enabling formation of nanostructures engineered at the molecular level. Ballistic electron emission microscopy (BEEM) spectra performed on the organic monolayer on oxide-free silicon capped by a thin gold layer reveals for the first time an increase in transmission of the ballistic current through the interface of up to three times compared to a control device, in contrast to similar studies reported in the literature suggestive of oxide-free passivation in SCCO2. The SCCO2 process combined with the preliminary BEEM results opens up new avenues for interface engineering, leading to molecular electronic devices.
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Affiliation(s)
- Sreenivasa Reddy Puniredd
- †Department of Chemical and Biomolecular Engineering, National University of Singapore, Engineering Drive 4, Singapore 117576
- ‡Institute of Materials Research and Engineering, A*STAR (Agency for Science, Technology and Research), 3 Research Link, Singapore 117602
| | - Sundaramurthy Jayaraman
- †Department of Chemical and Biomolecular Engineering, National University of Singapore, Engineering Drive 4, Singapore 117576
| | - Sai Hooi Yeong
- †Department of Chemical and Biomolecular Engineering, National University of Singapore, Engineering Drive 4, Singapore 117576
| | - Cedric Troadec
- ‡Institute of Materials Research and Engineering, A*STAR (Agency for Science, Technology and Research), 3 Research Link, Singapore 117602
| | - M P Srinivasan
- †Department of Chemical and Biomolecular Engineering, National University of Singapore, Engineering Drive 4, Singapore 117576
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8
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Direct deposition of chitosan macromolecules on a substrate from solutions in supercritical carbon dioxide: Solubility and conformational analysis. Eur Polym J 2012. [DOI: 10.1016/j.eurpolymj.2012.03.003] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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9
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Kunita MH, Guilherme MR, Filho LC, Muniz EC, Franceschi E, Dariva C, Rubira AF. Solid-state radical grafting reaction of glycidyl methacrylate and poly(4-methyl-1-pentene) in supercritical carbon dioxide: Surface morphology and adhesion. J Colloid Interface Sci 2011; 361:331-7. [DOI: 10.1016/j.jcis.2011.05.024] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2011] [Revised: 05/06/2011] [Accepted: 05/08/2011] [Indexed: 10/18/2022]
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10
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Jradi K, Laour D, Daneault C, Chabot B. Control of the chemical and physical behaviour of silicon surfaces for enhancing the transition from hydrophilic to superhydrophobic surfaces. Colloids Surf A Physicochem Eng Asp 2011. [DOI: 10.1016/j.colsurfa.2010.10.050] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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11
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Satija J, Sai VVR, Mukherji S. Dendrimers in biosensors: Concept and applications. ACTA ACUST UNITED AC 2011. [DOI: 10.1039/c1jm10527b] [Citation(s) in RCA: 124] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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13
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Nikitin LN, Gallyamov MO, Said-Galiev EE, Khokhlov AR, Buznik VM. Supercritical carbon dioxide: A reactive medium for chemical processes involving fluoropolymers. RUSS J GEN CHEM+ 2009. [DOI: 10.1134/s1070363209030396] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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14
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Puniredd SR, Nguan BCC, Srinivasan M. Covalent molecular assembly in supercritical carbon dioxide: Formation of nanoparticles in immobilized dendrimers within a porous silica gel matrix. J Colloid Interface Sci 2009; 333:679-83. [DOI: 10.1016/j.jcis.2008.10.084] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2008] [Revised: 10/02/2008] [Accepted: 10/02/2008] [Indexed: 10/21/2022]
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15
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Puniredd SR, Yin CM, Hooi YS, Lee P, Srinivasan M. Dendrimer-encapsulated Pt nanoparticles in supercritical medium: Synthesis, characterization, and application to device fabrication. J Colloid Interface Sci 2009; 332:505-10. [DOI: 10.1016/j.jcis.2009.01.011] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2008] [Revised: 10/13/2008] [Accepted: 01/07/2009] [Indexed: 11/24/2022]
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16
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Gallyamov MO, Chaschin IS, Gamzazade AI, Khokhlov AR. Chitosan Molecules Deposited from Supercritical Carbon Dioxide on a Substrate: Visualization and Conformational Analysis. MACROMOL CHEM PHYS 2008. [DOI: 10.1002/macp.200800419] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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17
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Puniredd SR, Weiyi S, Srinivasan M. Pd–Pt and Fe–Ni nanoparticles formed by covalent molecular assembly in supercritical carbon dioxide. J Colloid Interface Sci 2008; 320:333-40. [DOI: 10.1016/j.jcis.2007.11.034] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2007] [Revised: 10/04/2007] [Accepted: 11/06/2007] [Indexed: 10/22/2022]
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18
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Newkome GR, Shreiner CD. Poly(amidoamine), polypropylenimine, and related dendrimers and dendrons possessing different 1→2 branching motifs: An overview of the divergent procedures. POLYMER 2008. [DOI: 10.1016/j.polymer.2007.10.021] [Citation(s) in RCA: 313] [Impact Index Per Article: 19.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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19
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Puniredd SR, Wai YK, Satyanarayana N, Sinha SK, Srinivasan MP. Tribological properties of nanoparticle-laden ultrathin films formed by covalent molecular assembly. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2007; 23:8299-303. [PMID: 17608504 DOI: 10.1021/la0635707] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
The tribological properties of ultrathin films containing nanoparticles encapsulated in immobilized dendrimers are investigated. The films were formed by covalent molecular assembly in supercritical carbon dioxide, and the Au nanoparticles were formed in aqueous solution. End-capping of the terminal amine groups of the dendrimer by fluorinated species resulted in a reduction in the size of the nanoparticles formed. The resulting film structure displayed a lower coefficient of friction when the nanoparticles were formed after fluorination. The observed improvement in the tribological properties is attributed to the reduction in agglomeration of the nanoparticles due to the presence of the fluorine moieties.
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Affiliation(s)
- Sreenivasa Reddy Puniredd
- Department of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, Singapore 117576
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20
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Puniredd SR, Srinivasan MP. Covalent Molecular Assembly in a Supercritical Medium: Formation of Nanoparticles Encapsulated in Immobilized Dendrimers. Ind Eng Chem Res 2006. [DOI: 10.1021/ie060822q] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Sreenivasa Reddy Puniredd
- Department of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, Singapore 117576
| | - M. P. Srinivasan
- Department of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, Singapore 117576
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