1
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Doram A, Outokesh M, Ahmadi SJ, Zahakifar F. Synthesis of “(aminomethyl)phosphonic acid-functionalized graphene oxide”, and comparison of its adsorption properties for thorium(IV) ion, with plain graphene oxide. RADIOCHIM ACTA 2021. [DOI: 10.1515/ract-2021-1090] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
The current study presents a simple and scalable method for the synthesis of (aminomethyl)phosphonic acid-functionalized graphene oxide (AMPA-GO) adsorbent. The chemical structure of the new material was disclosed by different instrumental analyses (e.g. FTIR, Raman, XPS, AFM, TEM, XRD, CHN, and UV), and two pertinent mechanisms namely nucleophilic substitution and condensation were suggested for its formation. Adsorption experiments revealed that both AMPA-GO and plain GO have a high affinity toward Th(IV) ions, but the AMPA-GO is superior in terms of adsorption capacity, rate of adsorption, selectivity, pH effect, etc. Indeed, the AMPA-GO can uptake Th(IV) nearly instantaneously, and coexisting Na+ ions have no effect on its adsorption. Thanks to Langmuir isotherm, the maximum adsorption capacities of the GO and AMPA-GO were obtained 151.06 and 178.67 mg g−1, respectively. Interestingly, GO and AMPA-GO both showed a higher preference for thorium over uranium so that the average “K
d
(Th)/K
d
(U)” for them was 52 and 44, respectively. This data suggests that chromatographic separation of thorium and uranium is feasible by these adsorbents.
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Affiliation(s)
- Amir Doram
- Department of Energy Engineering , Sharif University of Technology , P.O. Box 11365-8639 , Tehran , Iran
| | - Mohammad Outokesh
- Department of Energy Engineering , Sharif University of Technology , P.O. Box 11365-8639 , Tehran , Iran
| | - Seyed Javad Ahmadi
- Nuclear Fuel Cycle Research School , Nuclear Science and Technology Research Institute , AEOI, P.O. Box: 11365-8486 Tehran , Iran
| | - Fazel Zahakifar
- Nuclear Fuel Cycle Research School , Nuclear Science and Technology Research Institute , AEOI, P.O. Box: 11365-8486 Tehran , Iran
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2
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Aynehband S, Mohammadi M, Poushimin R, Nunzi JM, Simchi A. Efficient FAPbI 3–PbS quantum dot graphene-based phototransistors. NEW J CHEM 2021. [DOI: 10.1039/d1nj03139b] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
PbS quantum dots capped with formamidinium ligands were deposited as graphene-based photodetectors. Solid phase exchange improves the infrared photo-detectivity.
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Affiliation(s)
- Samaneh Aynehband
- Department of Materials Science and Engineering, Sharif University of Technology, 14588 Tehran, Iran
- Department of Chemistry, Department of Physics, Engineering Physics and Astronomy, Queens University, Kingston, Ontario K7L 3N6, Canada
| | - Maryam Mohammadi
- Department of Materials Science and Engineering, Sharif University of Technology, 14588 Tehran, Iran
| | - Rana Poushimin
- Department of Chemistry, Department of Physics, Engineering Physics and Astronomy, Queens University, Kingston, Ontario K7L 3N6, Canada
| | - Jean-Michel Nunzi
- Department of Chemistry, Department of Physics, Engineering Physics and Astronomy, Queens University, Kingston, Ontario K7L 3N6, Canada
| | - Abdolreza Simchi
- Department of Materials Science and Engineering, Sharif University of Technology, 14588 Tehran, Iran
- Institute for Nanoscience and Nanotechnology, Sharif University of Technology, 14588 Tehran, Iran
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3
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Aynehband S, Mohammadi M, Thorwarth K, Hany R, Nüesch FA, Rossell MD, Pauer R, Nunzi JM, Simchi A. Solution Processing and Self-Organization of PbS Quantum Dots Passivated with Formamidinium Lead Iodide (FAPbI 3). ACS OMEGA 2020; 5:15746-15754. [PMID: 32637850 PMCID: PMC7331203 DOI: 10.1021/acsomega.0c02319] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/18/2020] [Accepted: 06/05/2020] [Indexed: 05/02/2023]
Abstract
Solution-processed lead sulfide quantum dots (PbS QDs) are very attractive as NIR-active semiconductors for the fabrication of cost-efficient optoelectronic devices. To control the thin film carrier transport, as well as stability, surface passivation is of crucial importance. Here, we present the successful surface passivation of PbS QDs by the formamidinium lead iodide (FAPbI3) ligand. An effective procedure for the fabrication of FAPbI3-passivated PbS QDs through a binary-phase ligand exchange protocol in hexane and n-methylformamide is demonstrated. It is shown that this solution-processed ligand exchange drastically changes the photoluminescence intensity, exciton recombination dynamics, and carrier lifetime of the nanocrystals. The solution casting of the ligand-exchanged nanocrystals into thin films results in the periodic ordering of QDs in a square superlattice with close contacts. Planar graphene/QD photodetectors fabricated with PbS QDs passivated with FAPbI3 show substantially increased thermal stability as compared to similar devices using PbS QDs passivated with commonly used methylammonium lead iodide.
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Affiliation(s)
- Samaneh Aynehband
- Department
of Materials Science and Engineering, Sharif
University of Technology, 14588 Tehran, Iran
- Laboratory
for Functional Polymers, Empa, Swiss Federal
Laboratories for Materials Science and Technology, 8600 Dübendorf, Switzerland
- Department
of Chemistry, Department of Physics, Engineering Physics and Astronomy, Queens University, Kingston, Ontario K7L
3N6, Canada
| | - Maryam Mohammadi
- Department
of Materials Science and Engineering, Sharif
University of Technology, 14588 Tehran, Iran
| | - Kerstin Thorwarth
- Surface
Science and Coating Technologies, Empa,
Swiss Federal Laboratories for Materials Science and Technology, 8600 Dübendorf, Switzerland
| | - Roland Hany
- Laboratory
for Functional Polymers, Empa, Swiss Federal
Laboratories for Materials Science and Technology, 8600 Dübendorf, Switzerland
| | - Frank Alain Nüesch
- Laboratory
for Functional Polymers, Empa, Swiss Federal
Laboratories for Materials Science and Technology, 8600 Dübendorf, Switzerland
- Institute
of Materials Science and Engineering, EPFL,
Ecole Polytechnique Fédérale de Lausanne, Station 12, 1015 Lausanne, Switzerland
| | - Marta D. Rossell
- Electron
Microscopy Center, Empa, Swiss Federal Laboratories
for Materials Science and Technology, Überlandstrasse 129, 8600 Dübendorf, Switzerland
| | - Robin Pauer
- Electron
Microscopy Center, Empa, Swiss Federal Laboratories
for Materials Science and Technology, Überlandstrasse 129, 8600 Dübendorf, Switzerland
| | - Jean-Michel Nunzi
- Department
of Chemistry, Department of Physics, Engineering Physics and Astronomy, Queens University, Kingston, Ontario K7L
3N6, Canada
| | - Abdolreza Simchi
- Department
of Materials Science and Engineering, Sharif
University of Technology, 14588 Tehran, Iran
- Institute
for Nanoscience and Nanotechnology, Sharif
University of Technology, 14588 Tehran, Iran
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4
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Tavakoli Dastjerdi H, Qi P, Fan Z, Tavakoli MM. Cost-Effective and Semi-Transparent PbS Quantum Dot Solar Cells Using Copper Electrodes. ACS APPLIED MATERIALS & INTERFACES 2020; 12:818-825. [PMID: 31820641 DOI: 10.1021/acsami.9b18487] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
PbS quantum dots (QDs) have gained significant attention as promising solution-based materials for third generation of photovoltaic (PV) devices, thanks to their size-tunable band gap, air stability, and low-cost solution processing. Gold (Au), despite its high cost, is the standard electrode in the conventional PbS QD PV architecture because of its perfect alignment with valence levels of PbS QDs. However, to comply with manufacturing requirements for scalable device processing, alternative cost-effective electrodes are urgently required. Here, we employed an interface engineering approach and deposited poly(3-hexylthiophene-2,5-diyl) as a hole transport layer on 1,2-ethanedithiol-capped PbS QDs in order to adjust the valence band of QDs with the work function of inexpensive copper (Cu) electrodes. In fact, this is the first report of a Au-free PbS QD PV system employing the conventional device structure. Our Cu-based device shows a maximum power conversion efficiency (PCE) of 8.7% which is comparable with that of the Au-based device (10.2%). Interestingly, the P3HT-based device shows improved stability with relatively 10% PCE loss after 230 h under continuous illumination. Moreover, using an ultrathin Cu electrode, a semitransparent PbS QD PV is fabricated with a remarkably high average visible transparency of 26% and a PCE of 7.4%.
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Affiliation(s)
| | - Pengfei Qi
- Zhong Shan Rui Ke New Energy Company, Limited , 13th Torch Road, Torch Development Zone , Zhongshan City , Guangdong Province 528437 , China
| | - Zhiyong Fan
- Department of Electronic and Computer Engineering , The Hong Kong University of Science and Technology , Clear Water Bay, Kowloon , Hong Kong SAR , China
- HKUST-Shenzhen Research Institute , No. 9 Yuexing First RD, South Area, Hi-tech Park , Nanshan, Shenzhen 518057 , China
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5
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Tavakoli Dastjerdi H, Prochowicz D, Yadav P, Tavakoli MM. Synergistic ligand exchange and UV curing of PbS quantum dots for effective surface passivation. NANOSCALE 2019; 11:22832-22840. [PMID: 31755484 DOI: 10.1039/c9nr07854a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Lead sulfide (PbS) quantum dots (QDs) are promising materials in solution-processed photovoltaic (PV) devices due to their tunable bandgap and low-cost processing. Replacing the long oleic acid ligands of the as-synthesized QDs with shorter ligands is a key step for making functional QD PVs with correctly tuned band energies and reduced non-radiative recombination centers. In this work, we study the effect of ultraviolet (UV) treatment of PbS QD layers on the QD surface states during ligand exchange. We demonstrate that this straightforward approach effectively reduces the surface trap states and passivates the surface of QDs. We find that UV treatment reduces the density of hydroxyl groups attached to the QD surface and improves the bonding of short ligands to the QD surface. Multiple analyses show the reduction of nonradiative recombination centers for the UV-treated sample. The power conversion efficiency (PCE) of our optimized PbS QD device reached 10.7% (vs. 9% for the control device) and was maintained above 10% after 230 h of constant illumination.
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Affiliation(s)
- Hadi Tavakoli Dastjerdi
- Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
| | - Daniel Prochowicz
- Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
| | - Pankaj Yadav
- Department of Solar Energy, School of Technology, Pandit Deendayal Petroleum University, Gandhinagar-382 007, Gujarat, India
| | - Mohammad Mahdi Tavakoli
- Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
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6
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Mukherjee S, Jana S, Sinha TK, Das S, Ray SK. Infrared tunable, two colour-band photodetectors on flexible platforms using 0D/2D PbS-MoS 2 hybrids. NANOSCALE ADVANCES 2019; 1:3279-3287. [PMID: 36133580 PMCID: PMC9419818 DOI: 10.1039/c9na00302a] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/15/2019] [Accepted: 07/10/2019] [Indexed: 05/02/2023]
Abstract
Two-dimensional (2D) MoS2 nanosheets have been integrated with zero-dimensional (0D) PbS quantum dots to achieve a superior optical response extending to the short-wavelength infrared region along with a broadband visible response for multispectral photodetection. The 0D/2D hybrid nanostructures have been synthesized by a one pot, stabilizer-free solvothermal growth process. Microscopic and spectroscopic studies confirmed the formation of PbS QD decorated semiconducting 2H-MoS2 layers. The size tunable absorption features with longer photo-generated carrier lifetime of synthesized hybrid nanostructures indicate that the integration of PbS QDs in MoS2 could be a viable approach for fabricating two-colour band photodetectors, viz. visible broadband and wavelength selective short-wave IR photodetectors. Devices have also been demonstrated on polyethylene terephthalate substrates using a solution-based synthesis technique for flexible and ultrathin optoelectronic device applications. The photodetection performance of fabricated devices suggests that the synergic 0D/2D hybrid nanostructures are significantly superior to solution processed hybrid devices operating in the infrared region. The successful integration of 0D QDs in 2D materials may pave the way for novel, high performance, next-generation CMOS compatible flexible photonic devices.
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Affiliation(s)
- S Mukherjee
- Department of Physics, Indian Institute of Technology Kharagpur India-721302
| | - S Jana
- Department of Physics, Indian Institute of Technology Kharagpur India-721302
| | - T K Sinha
- Department of Physics, Indian Institute of Technology Kharagpur India-721302
| | - S Das
- School of Medical Science & Technology, Indian Institute of Technology Kharagpur India-721302
| | - S K Ray
- Department of Physics, Indian Institute of Technology Kharagpur India-721302
- S. N. Bose National Centre for Basic Sciences Salt Lake Kolkata India-700 106
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7
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A General Route for Growing Metal Sulfides onto Graphene Oxide and Exfoliated Graphite Oxide. NANOMATERIALS 2017; 7:nano7090245. [PMID: 28858234 PMCID: PMC5618356 DOI: 10.3390/nano7090245] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/15/2017] [Revised: 08/18/2017] [Accepted: 08/26/2017] [Indexed: 01/11/2023]
Abstract
Graphene-based materials are elective materials for a number of technologies due to their unique properties. Also, semiconductor nanocrystals have been extensively explored due to their size-dependent properties that make them useful for several applications. By coupling both types of materials, new applications are envisaged that explore the synergistic properties in such hybrid nanostructures. This research reports a general wet chemistry method to prepare graphene oxide (GO) sheets decorated with nanophases of semiconductor metal sulfides. This method allows the in situ growth of metal sulfides onto GO by using metal dialkyldithiocarbamate complexes as single-molecule precursors. In particular, the role of GO as heterogeneous substrate for the growth of semiconductor nanocrystals was investigated by using Raman spectroscopic and imaging methods. The method was further extended to other graphene-based materials, which are easily prepared in a larger scale, such as exfoliated graphite oxide (EGO).
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8
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Fabrication of new magnetite-graphene nanocomposite and comparison of its laser-hyperthermia properties with conventionally prepared magnetite-graphene hybrid. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2017; 75:572-581. [DOI: 10.1016/j.msec.2017.02.086] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/14/2016] [Revised: 12/22/2016] [Accepted: 02/15/2017] [Indexed: 11/17/2022]
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9
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Feizi S, Malekie S, Rahighi R, Tayyebi A, Ziaie F. Evaluation of dosimetric characteristics of graphene oxide/PVC nanocomposite for gamma radiation applications. RADIOCHIM ACTA 2017; 105:161-170. [DOI: 10.1515/ract-2016-2648] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/22/2023]
Abstract
Abstract
Graphene oxide-polyvinyl chloride composite was prepared using tetrahydrofuran solvent-assisted dispersion of characterized nano flakes of graphene oxide in polymer matrix. Electrical percolation threshold of GO/PVC nanocomposite was determined via a finite element simulation method with a 2D model and compared with experimental results. A conductive cell with two silver coated walls was designed and fabricated for exploring dosimetric properties of the composite. Some characteristics of the new nanocomposite such as linearity of dose response, repeatability, sensitivity and angular dependence are investigated. According to 2D proposed method, obtained data associated to electrical conductivity of the GO/polymer composite for PVC matrix plotted in different GO weight percentages and had good compatibility (validity) with experimental data. The dose response is linear in the 17–51 mGy dose range and it can be introduced for gamma radiation dosimetry in diagnostic activities.
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Affiliation(s)
- Shahzad Feizi
- Radiation Application Research School, Nuclear Science and Technology Research Institute (NSTRI), Moazzen Blvd., Rajaeeshahr, P.O. Box 31485-498, Karaj, Iran (Islamic Republic of)
| | - Shahryar Malekie
- Radiation Application Research School, Nuclear Science and Technology Research Institute (NSTRI), Moazzen Blvd., Rajaeeshahr, P.O. Box 31485-498, Karaj, Iran (Islamic Republic of)
| | - Reza Rahighi
- Department of Physics, Sharif University of Technology, Tehran, Iran (Islamic Republic of)
| | - Ahmad Tayyebi
- Department of Physics, Sharif University of Technology, Tehran, Iran (Islamic Republic of)
| | - Farhood Ziaie
- Radiation Application Research School, Nuclear Science and Technology Research Institute (NSTRI), Moazzen Blvd., Rajaeeshahr, P.O. Box 31485-498, Karaj, Iran (Islamic Republic of)
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10
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Synthesis of graphene oxide/magnesium oxide nanocomposites with high-rate adsorption of methylene blue. J Mol Liq 2016. [DOI: 10.1016/j.molliq.2016.09.049] [Citation(s) in RCA: 96] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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11
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Fazaeli Y, Rahighi R, Tayyebi A, Feizi S. Synthesis, characterization and biological evaluation of a well dispersed suspension of gallium-68-labeled magnetic nanosheets of graphene oxide for in vivo coincidence imaging. RADIOCHIM ACTA 2016. [DOI: 10.1515/ract-2015-2556] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Abstract
Graphene oxide (GO) nanosheets were hybridized with Fe3O4 nanoparticles (NPs) to form magnetic GO (MGO) and were further labeled by [68Ga]GaCl3 as a potential drug delivery system. Paper chromatography, Fourier transform infra red (FTIR) spectroscopy, low-angle X-ray diffraction (XRD), CHN and atomic force microscopy (AFM) were utilized to characterize the trinary composite ([68Ga]@MGO). Biological evaluations of the prepared nanocomposite were performed in normal Sprague Dawley rats and it was found to be a possible host for theranostic radiopharmaceuticals. The results showed that the grafting of Fe3O4 NPs on nanocomposite reduced the unwanted liver and spleen uptakes and increased the ratio of kidney/liver uptake from 0.037 to 1.07, leading to the fast removal of radioactive agent and less imposed radiation to patients. The high level of hydrogen bonding caused by the presence of functional groups is responsible for this effect. Considering the accumulation of the tracer in vital organs of rat (especially brain), efficient iron oxide grafting, fast wash-out, the short half-life gallium-68 and less imposed radiation doses to patients, this nanocomposite could be a suitable candidate for positron emission tomography (PET) studies and imaging applications.
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Affiliation(s)
- Yousef Fazaeli
- Radiation Application Research School, Nuclear Science and Technology Research Institute (NSTRI), Moazzen Blvd., Rajaeeshahr, P.O. Box 31485-498, Karaj, Iran (Islamic Republic of)
| | - Reza Rahighi
- Department of Physics, Sharif University of Technology, P.O. Box 11155-9161, Tehran, Iran (Islamic Republic of)
| | - Ahmad Tayyebi
- Department of Energy Engineering, Sharif University of Technology, P.O. Box 11365-8639, Tehran, Iran (Islamic Republic of)
| | - Shahzad Feizi
- Radiation Application Research School, Nuclear Science and Technology Research Institute (NSTRI), Moazzen Blvd., Rajaeeshahr, P.O. Box 31485-498, Karaj, Iran (Islamic Republic of)
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12
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Georgakilas V, Tiwari JN, Kemp KC, Perman JA, Bourlinos AB, Kim KS, Zboril R. Noncovalent Functionalization of Graphene and Graphene Oxide for Energy Materials, Biosensing, Catalytic, and Biomedical Applications. Chem Rev 2016; 116:5464-519. [DOI: 10.1021/acs.chemrev.5b00620] [Citation(s) in RCA: 1608] [Impact Index Per Article: 201.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
| | - Jitendra N. Tiwari
- Center
for Superfunctional Materials, Department of Chemistry, Ulsan National Institute of Science and Technology (UNIST), Ulsan 689-798, Korea
| | - K. Christian Kemp
- Center
for Superfunctional Materials, Department of Chemistry, Ulsan National Institute of Science and Technology (UNIST), Ulsan 689-798, Korea
| | - Jason A. Perman
- Regional
Centre of Advanced Technologies and Materials, Department of Physical
Chemistry, Faculty of Science, Palacky University in Olomouc, 17 Listopadu
1192/12, 771 46 Olomouc, Czech Republic
| | - Athanasios B. Bourlinos
- Regional
Centre of Advanced Technologies and Materials, Department of Physical
Chemistry, Faculty of Science, Palacky University in Olomouc, 17 Listopadu
1192/12, 771 46 Olomouc, Czech Republic
| | - Kwang S. Kim
- Center
for Superfunctional Materials, Department of Chemistry, Ulsan National Institute of Science and Technology (UNIST), Ulsan 689-798, Korea
| | - Radek Zboril
- Regional
Centre of Advanced Technologies and Materials, Department of Physical
Chemistry, Faculty of Science, Palacky University in Olomouc, 17 Listopadu
1192/12, 771 46 Olomouc, Czech Republic
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13
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Tavakoli MM, Simchi A, Fan Z, Aashuri H. Chemical processing of three-dimensional graphene networks on transparent conducting electrodes for depleted-heterojunction quantum dot solar cells. Chem Commun (Camb) 2016; 52:323-6. [DOI: 10.1039/c5cc06955f] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The improvement of device performance by using a 3DGN structure as a fast extraction layer for electrons is shown.
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Affiliation(s)
- Mohammad Mahdi Tavakoli
- Department of Materials Science and Engineering
- Sharif University of Technology
- 14588 Tehran
- Iran
- Department of Electronic and Computer Engineering
| | - Abdolreza Simchi
- Department of Materials Science and Engineering
- Sharif University of Technology
- 14588 Tehran
- Iran
- Institute for Nanoscience and Nanotechnology
| | - Zhiyong Fan
- Department of Electronic and Computer Engineering
- Hong Kong University of Science and Technology
- Kowloon
- Hong Kong
| | - Hossein Aashuri
- Department of Materials Science and Engineering
- Sharif University of Technology
- 14588 Tehran
- Iran
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14
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Tavakoli MM, Mirfasih MH, Hasanzadeh S, Aashuri H, Simchi A. Surface passivation of lead sulfide nanocrystals with low electron affinity metals: photoluminescence and photovoltaic performance. Phys Chem Chem Phys 2016; 18:12086-92. [DOI: 10.1039/c5cp07987j] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Low electron affinity metals like Cd can annihilate deep trap states and increase the current density, resulting in higher performance.
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Affiliation(s)
- Mohammad Mahdi Tavakoli
- Department of Materials Science and Engineering
- Sharif University of Technology
- 14588 Tehran
- Iran
| | | | - Soheil Hasanzadeh
- Department of Materials Science and Engineering
- Sharif University of Technology
- 14588 Tehran
- Iran
| | - Hossein Aashuri
- Department of Materials Science and Engineering
- Sharif University of Technology
- 14588 Tehran
- Iran
| | - Abdolreza Simchi
- Department of Materials Science and Engineering
- Sharif University of Technology
- 14588 Tehran
- Iran
- Institute for Nanoscience and Nanotechnology
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15
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Tayyebi A, Outokesh M. Supercritical synthesis of a magnetite-reduced graphene oxide hybrid with enhanced adsorption properties toward cobalt & strontium ions. RSC Adv 2016. [DOI: 10.1039/c5ra19057f] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The current study presents a supercritical synthesis of magnetite-reduced graphene oxide (M-RGO) in methanol media, in which Fe3O4 nanoparticles are simultaneously formed, surface modified and decorated on the surface of the reduced graphene oxide.
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Affiliation(s)
- Ahmad Tayyebi
- Department of Energy Engineering
- Sharif University of Technology
- Tehran
- Iran
| | - Mohammad Outokesh
- Department of Energy Engineering
- Sharif University of Technology
- Tehran
- Iran
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16
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Tavakoli MM, Aashuri H, Simchi A, Fan Z. Hybrid zinc oxide/graphene electrodes for depleted heterojunction colloidal quantum-dot solar cells. Phys Chem Chem Phys 2015; 17:24412-9. [DOI: 10.1039/c5cp03571f] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Recently, hybrid nanocomposites consisting of graphene/nanomaterial heterostructures have emerged as promising candidates for the fabrication of optoelectronic devices.
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Affiliation(s)
- Mohammad Mahdi Tavakoli
- Department of Materials Science and Engineering
- Sharif University of Technology
- 14588 Tehran
- Iran
- Department of Electronic and Computer Engineering
| | - Hossein Aashuri
- Department of Materials Science and Engineering
- Sharif University of Technology
- 14588 Tehran
- Iran
| | - Abdolreza Simchi
- Department of Materials Science and Engineering
- Sharif University of Technology
- 14588 Tehran
- Iran
- Institute for Nanoscience and Nanotechnology
| | - Zhiyong Fan
- Department of Electronic and Computer Engineering
- Hong Kong University of Science and Technology
- Kowloon
- Hong Kong
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