1
|
Malik SB, Gul A, Saggu JI, Abbasi BA, Azad B, Iqbal J, Kazi M, Chalgham W, Firoozabadi SAM. Fabrication and Characterization of Ag-Graphene Nanocomposites and Investigation of Their Cytotoxic, Antifungal and Photocatalytic Potential. Molecules 2023; 28:molecules28104139. [PMID: 37241880 DOI: 10.3390/molecules28104139] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2023] [Revised: 05/11/2023] [Accepted: 05/11/2023] [Indexed: 05/28/2023] Open
Abstract
In the present study, we aimed to synthesize (Ag)1-x(GNPs)x nanocomposites in variable ratios (25% GNPs-Ag, 50% GNPs-Ag, and 75% GNPs-Ag) via an ex situ approach to investigate the incremental effects of GNPs (graphene nanoparticles) on AgNPs (silver nanoparticles). The prepared nanocomposites were successfully characterized using different microscopic and spectroscopic techniques, including X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, ultraviolet spectroscopy, and Raman spectroscopic analysis. For the evaluation of morphological aspects, shape, and percentage elemental composition, SEM and EDX analyses were employed. The bioactivities of the synthesized nanocomposites were briefly investigated. The antifungal activity of (Ag)1-x(GNPs)x nanocomposites was reported to be 25% for AgNPs and 66.25% using 50% GNPs-Ag against Alternaria alternata. The synthesized nanocomposites were further evaluated for cytotoxic potential against U87 cancer cell lines with improved results (for pure AgNPs IC50: ~150 µg/mL, for 50% GNPs-Ag IC50: ~12.5 µg/mL). The photocatalytic properties of the nanocomposites were determined against the toxic dye Congo red, and the percentage degradation was recorded as 38.35% for AgNPs and 98.7% for 50% GNPs-Ag. Hence, from the results, it is concluded that silver nanoparticles with carbon derivatives (graphene) have strong anticancer and antifungal properties. Dye degradation strongly confirmed the photocatalytic potential of Ag-graphene nanocomposites in the removal of toxicity present in organic water pollutants.
Collapse
Affiliation(s)
- Sidra Batool Malik
- Department of Biological Sciences, International Islamic University, Islamabad 44000, Pakistan
| | - Asma Gul
- Department of Biological Sciences, International Islamic University, Islamabad 44000, Pakistan
| | - Javed Iqbal Saggu
- Department of Physics, Quaid-i-Azam University, Islamabad 45320, Pakistan
| | - Banzeer Ahsan Abbasi
- Department of Botany, Rawalpindi Women University, 6th Road, Satellite Town, Rawalpindi 46300, Pakistan
| | - Beenish Azad
- Department of Biological Sciences, International Islamic University, Islamabad 44000, Pakistan
| | - Javed Iqbal
- 2Department of Botany, Bacha Khan University, Charsadda 24420, Pakistan
| | - Mohsin Kazi
- Department of Pharmaceutics, College of Pharmacy, King Saud University, P.O. Box 2457, Riyadh 11451, Saudi Arabia
| | - Wadie Chalgham
- Department of Mechanical and Aerospace Engineering, University of California, Los Angeles, CA 90095, USA
| | | |
Collapse
|
2
|
Atomically Precise Metal Nanoclusters versus Metal Nanocrystals: Maneuvering Tunable Charge Transfer in an Integrated Photosystem. Inorg Chem 2022; 61:19022-19030. [DOI: 10.1021/acs.inorgchem.2c03634] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
3
|
Han S, Li W, Xi H, Yuan R, Long J, Xu C. Plasma-assisted in-situ preparation of graphene-Ag nanofiltration membranes for efficient removal of heavy metal ions. JOURNAL OF HAZARDOUS MATERIALS 2022; 423:127012. [PMID: 34461540 DOI: 10.1016/j.jhazmat.2021.127012] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/14/2021] [Revised: 08/19/2021] [Accepted: 08/20/2021] [Indexed: 06/13/2023]
Abstract
Graphene-based membranes have been considered as promising separation membranes for water treatments due to their unique two-dimensional confined channels. However, subject to the preparation technology, the effective construction of graphene-based filtration membranes with suitable separation ability on heavy metal ions still face considerable challenges. Herein, we have successfully constructed a kind of graphene-based (reduced graphene oxide, rGO) nanofiltration membranes by adopting a plasma-assisted in-situ photocatalytic reduction method. Graphene oxide-Ag (GO-Ag) composite sheets are prepared firstly and then assembled into membranes by vacuum filtration. With the use of Ag nanoparticles as plasmonic photocatalyst, GO-Ag films can be in-situ reduced, leading to the formation of rGO-based composite membranes. Thanks to the mild in-situ reduction process, the filtration ability on heavy metal ions (Cr(VI), Cr3+, Cu2+ and Pb2+) caused by lamellar structure is well retained in the as-formed rGO-Ag membranes. Especially, when treating the typical toxic Cr(VI) solution, the retention capacity, water flux and stability of rGO-Ag membranes are all improved compared with that of the original GO-Ag ones. In addition, the effectively rejection of Cr(VI) from mixed solutions containing both Cr(VI) and Cr(III) also suggests the good applicability of such rGO-Ag membranes in a complex wastewater system.
Collapse
Affiliation(s)
- Shitong Han
- State Key Laboratory of Photocatalysis on Energy and Environment, College of Chemistry, Fuzhou University, Fuzhou 350108, PR China; State Key Laboratory of NBC Protection for Civilian, Beijing 102205, PR China
| | - Wenyue Li
- State Key Laboratory of Photocatalysis on Energy and Environment, College of Chemistry, Fuzhou University, Fuzhou 350108, PR China
| | - Hailing Xi
- State Key Laboratory of NBC Protection for Civilian, Beijing 102205, PR China
| | - Rusheng Yuan
- State Key Laboratory of Photocatalysis on Energy and Environment, College of Chemistry, Fuzhou University, Fuzhou 350108, PR China
| | - Jinlin Long
- State Key Laboratory of Photocatalysis on Energy and Environment, College of Chemistry, Fuzhou University, Fuzhou 350108, PR China
| | - Chao Xu
- State Key Laboratory of Photocatalysis on Energy and Environment, College of Chemistry, Fuzhou University, Fuzhou 350108, PR China.
| |
Collapse
|
4
|
Spilarewicz-Stanek K, Jakimińska A, Kisielewska A, Batory D, Piwoński I. Understanding the Role of Silver Nanostructures and Graphene Oxide Applied as Surface Modification of TiO 2 in Photocatalytic Transformations of Rhodamine B under UV and Vis Irradiation. MATERIALS (BASEL, SWITZERLAND) 2020; 13:E4653. [PMID: 33086525 PMCID: PMC7603215 DOI: 10.3390/ma13204653] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/23/2020] [Revised: 10/12/2020] [Accepted: 10/14/2020] [Indexed: 11/16/2022]
Abstract
This work is focused on photocatalytic properties of titanium dioxide thin coatings modified with silver nanostructures (AgNSs) and graphene oxide (GO) sheets which were analyzed in processes of chemical transformations of rhodamine B (RhB) under ultraviolet (UV) or visible light (Vis) irradiation, respectively. UV-Vis spectroscopy was applied to analyze the changes in the RhB spectrum during photocatalytic processes, revealing decolorization of RhB solution under UV irradiation while the same process coexisting with the transformation of RhB to rhodamine 110 was observed under Vis irradiation. The novelty of this study is the elaboration of a methodology for determining the parameters characterizing the processes occurring under the Vis irradiation, which enables the comparison of photocatalysts' activity. For the first time, the method for quantification of rhodamine B transformation into rhodamine 110 in the presence of a semiconductor under visible light irradiation was proposed. Photocatalysts with various surface architectures were designed. TiO2 thin coatings were obtained by the sol-gel method. GO sheets were deposited on their surface using the dip-coating method. AgNSs were photogenerated on TiO2 or grown spontaneously on GO flakes. For characterization of obtained photocatalysts, scanning electron microscopy (SEM), X-ray diffraction (XRD) and diffuse-reflectance spectroscopy (DRS) techniques were applied. The results indicate that the surface architecture of prepared coatings does not affect the main reaction path but have an influence on the reaction rates and yields of observed processes.
Collapse
Affiliation(s)
- Kaja Spilarewicz-Stanek
- Department of Materials Technology and Chemistry, Faculty of Chemistry, University of Lodz, Pomorska 163, 90-236 Lodz, Poland
| | - Anna Jakimińska
- Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387 Krakow, Poland
| | - Aneta Kisielewska
- Department of Materials Technology and Chemistry, Faculty of Chemistry, University of Lodz, Pomorska 163, 90-236 Lodz, Poland
| | - Damian Batory
- Department of Vehicles and Fundamentals in Machine Design, Lodz University of Technology, Stefanowskiego 1/15, 90-924 Lodz, Poland
| | - Ireneusz Piwoński
- Department of Materials Technology and Chemistry, Faculty of Chemistry, University of Lodz, Pomorska 163, 90-236 Lodz, Poland
| |
Collapse
|
5
|
Chen Z, Zhang Y, Luo Q, Wang L, Liu S, Peng Y, Wang H, Shen L, Li Q, Wang Y. Maghemite (γ-Fe 2O 3) nanoparticles enhance dissimilatory ferrihydrite reduction by Geobacter sulfurreducens: Impacts on iron mineralogical change and bacterial interactions. J Environ Sci (China) 2019; 78:193-203. [PMID: 30665638 DOI: 10.1016/j.jes.2018.09.021] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2018] [Revised: 09/21/2018] [Accepted: 09/21/2018] [Indexed: 06/09/2023]
Abstract
Microbially mediated bioreduction of iron oxyhydroxide plays an important role in the biogeochemical cycle of iron. Geobacter sulfurreducens is a representative dissimilatory iron-reducing bacterium that assembles electrically conductive pili and cytochromes. The impact of supplementation with γ-Fe2O3 nanoparticles (NPs) (0.2 and 0.6 g) on the G. sulfurreducens-mediated reduction of ferrihydrite was investigated. In the overall performance of microbial ferrihydrite reduction mediated by γ-Fe2O3 NPs, stronger reduction was observed in the presence of direct contact with γ-Fe2O3 NPs than with indirect contact. Compared to the production of Fe(II) derived from biotic modification with ferrihydrite alone, increases greater than 1.6- and 1.4-fold in the production of Fe(II) were detected in the biotic modifications in which direct contact with 0.2 g and 0.6 g γ-Fe2O3 NPs, respectively, occurred. X-ray diffraction analysis indicated that magnetite was a unique representative iron mineral in ferrihydrite when active G. sulfurreducens cells were in direct contact with γ-Fe2O3 NPs. Because of the sorption of biogenic Fe(II) onto γ-Fe2O3 NPs instead of ferrihydrite, the addition of γ-Fe2O3 NPs could also contribute to increased duration of ferrihydrite reduction by preventing ferrihydrite surface passivation. Additionally, electron microscopy analysis confirmed that the direct addition of γ-Fe2O3 NPs stimulated the electrically conductive pili and cytochromes to stretch, facilitating long-range electron transfer between the cells and ferrihydrite. The obtained findings provide a more comprehensive understanding of the effects of iron oxide NPs on soil biogeochemistry.
Collapse
Affiliation(s)
- Zheng Chen
- Department of Chemical and Biochemical Engineering, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361001, China. E-mail: ; Department of Environmental Science, School of Environmental Science and Engineering, Tan Kah Kee College, Xiamen University, Zhangzhou 363105, China; Key Laboratory of Measurement and Control System for Coastal Environment, Fuqing Branch of Fujian Normal University, Fuqing 350300, China; Zhejiang Provincial Key Laboratory of Watershed Science and Health, School of Public Health and Management, Wenzhou Medical University, Wenzhou 325035, China
| | - Yaxian Zhang
- Department of Chemical and Biochemical Engineering, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361001, China. E-mail:
| | - Qingliu Luo
- Department of Chemical and Biochemical Engineering, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361001, China. E-mail:
| | - Liuying Wang
- Department of Chemical and Biochemical Engineering, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361001, China. E-mail:
| | - Shurui Liu
- Department of Chemical and Biochemical Engineering, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361001, China. E-mail:
| | - Yajuan Peng
- Department of Chemical and Biochemical Engineering, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361001, China. E-mail:
| | - Haitao Wang
- Department of Chemical and Biochemical Engineering, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361001, China. E-mail:
| | - Liang Shen
- Department of Chemical and Biochemical Engineering, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361001, China. E-mail:
| | - Qingbiao Li
- Department of Chemical and Biochemical Engineering, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361001, China. E-mail:
| | - Yuanpeng Wang
- Department of Chemical and Biochemical Engineering, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361001, China. E-mail: .
| |
Collapse
|
6
|
Observation of negative differential resistance in mesoscopic graphene oxide devices. Sci Rep 2018; 8:7144. [PMID: 29739956 PMCID: PMC5940784 DOI: 10.1038/s41598-018-22355-0] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2017] [Accepted: 02/21/2018] [Indexed: 11/22/2022] Open
Abstract
The fractions of various functional groups in graphene oxide (GO) are directly related to its electrical and chemical properties and can be controlled by various reduction methods like thermal, chemical and optical. However, a method with sufficient controllability to regulate the reduction process has been missing. In this work, a hybrid method of thermal and joule heating processes is demonstrated where a progressive control of the ratio of various functional groups can be achieved in a localized area. With this precise control of carbon-oxygen ratio, negative differential resistance (NDR) is observed in the current-voltage characteristics of a two-terminal device in the ambient environment due to charge-activated electrochemical reactions at the GO surface. This experimental observation correlates with the optical and chemical characterizations. This NDR behavior offers new opportunities for the fabrication and application of such novel electronic devices in a wide range of devices applications including switches and oscillators.
Collapse
|
7
|
Sol-Gel-Assisted Microwave-Derived Synthesis of Anatase Ag/TiO2/GO Nanohybrids toward Efficient Visible Light Phenol Degradation. Catalysts 2017. [DOI: 10.3390/catal7050133] [Citation(s) in RCA: 63] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
|
8
|
Badam R, Vedarajan R, Okaya K, Matsutani K, Matsumi N. Sacrificial Reducing Agent Free Photo-Generation of Platinum Nano Particle over Carbon/TiO 2 for Highly Efficient Oxygen Reduction Reaction. Sci Rep 2016; 6:37006. [PMID: 27845439 PMCID: PMC5109473 DOI: 10.1038/srep37006] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2016] [Accepted: 10/21/2016] [Indexed: 11/20/2022] Open
Abstract
Electrocatalytic materials for oxygen reduction reaction, currently dominated by platinum/carbon catalyst is marred by drawbacks such as use of copious amount of Pt and use of “non-green” sacrificial reducing agent (SRA) during its synthesis. A single stroke remedy for these two problems has been achieved through an in-situ aqueous photoreduction void of even trace amounts of SRA with an enhanced activity. Reduction of PtCl62− salt to Pt nano particles on carbon substrate was achieved solely using solar spectrum as the source of energy and TiO2 as photocatalyst. Here, we demonstrate that this new procedure of photoreduction, decorates Pt over different types of conducting allotropes with the distribution and the particle size primarily depending on the conductivity of the allotrope. The Pt/C/TiO2 composite unveiled an ORR activity on par to the most efficient Pt based electrocatalyst prepared through the conventional sacrificial reducing agent aided preparation methods.
Collapse
Affiliation(s)
- Rajashekar Badam
- School of Materials Science, Japan Advanced Institute of Science and Technology, 1-1 Asahidai, Nomi, Ishikawa 923-1292, Japan
| | - Raman Vedarajan
- School of Materials Science, Japan Advanced Institute of Science and Technology, 1-1 Asahidai, Nomi, Ishikawa 923-1292, Japan
| | - Kazuki Okaya
- Tanaka Kikinzoku Kogyo K.K, Nagatoro 2-14, Hiratsuka, Kanagawa 254-0021, Japan
| | - Koichi Matsutani
- Tanaka Kikinzoku Kogyo K.K, Nagatoro 2-14, Hiratsuka, Kanagawa 254-0021, Japan
| | - Noriyoshi Matsumi
- School of Materials Science, Japan Advanced Institute of Science and Technology, 1-1 Asahidai, Nomi, Ishikawa 923-1292, Japan
| |
Collapse
|
9
|
Lee YK, Choi H, Lee C, Lee H, Goddeti KC, Moon SY, Doh WH, Baik J, Kim JS, Choi JS, Choi CG, Park JY. Charge transport-driven selective oxidation of graphene. NANOSCALE 2016; 8:11494-11502. [PMID: 27199184 DOI: 10.1039/c6nr03077g] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Due to the tunability of the physical, electrical, and optical characteristics of graphene, precisely controlling graphene oxidation is of great importance for potential applications of graphene-based electronics. Here, we demonstrate a facile and precise way for graphene oxidation controlled by photoexcited charge transfer depending on the substrate and bias voltage. It is observed that graphene on TiO2 is easily oxidized under UV-ozone treatment, while graphene on SiO2 remains unchanged. The mechanism for the selective oxidation of graphene on TiO2 is associated with charge transfer from the TiO2 to the graphene. Raman spectra were used to investigate the graphene following applied bias voltages on the graphene/TiO2 diode under UV-ozone exposure. We found that under a reverse bias of 0.6 V on the graphene/TiO2 diode, graphene oxidation was accelerated under UV-ozone exposure, thus confirming the role of charge transfer between the graphene and the TiO2 that results in the selective oxidation of the graphene. The selective oxidation of graphene can be utilized for the precise, nanoscale patterning of the graphene oxide and locally patterned chemical doping, finally leading to the feasibility and expansion of a variety of graphene-based applications.
Collapse
Affiliation(s)
- Young Keun Lee
- Center for Nanomaterials and Chemical Reactions, Institute for Basic Science (IBS), Daejeon 305-701, Korea. and Graduate School of EEWS, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 305-701, Korea
| | - Hongkyw Choi
- Creative Research Center for Graphene Electronics, ETRI (Electronics and Telecommunications Research Institute), Gajeongno, Yuseong-gu, Daejeon, 305-700, Republic of Korea
| | - Changhwan Lee
- Center for Nanomaterials and Chemical Reactions, Institute for Basic Science (IBS), Daejeon 305-701, Korea. and Graduate School of EEWS, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 305-701, Korea
| | - Hyunsoo Lee
- Center for Nanomaterials and Chemical Reactions, Institute for Basic Science (IBS), Daejeon 305-701, Korea. and Graduate School of EEWS, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 305-701, Korea
| | - Kalyan C Goddeti
- Center for Nanomaterials and Chemical Reactions, Institute for Basic Science (IBS), Daejeon 305-701, Korea. and Graduate School of EEWS, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 305-701, Korea
| | - Song Yi Moon
- Center for Nanomaterials and Chemical Reactions, Institute for Basic Science (IBS), Daejeon 305-701, Korea. and Graduate School of EEWS, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 305-701, Korea
| | - Won Hui Doh
- Center for Nanomaterials and Chemical Reactions, Institute for Basic Science (IBS), Daejeon 305-701, Korea. and Graduate School of EEWS, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 305-701, Korea
| | - Jaeyoon Baik
- Pohang Accelerator Laboratory, Pohang University of Science and Technology, Pohang 790-784, Korea
| | - Jin-Soo Kim
- Creative Research Center for Graphene Electronics, ETRI (Electronics and Telecommunications Research Institute), Gajeongno, Yuseong-gu, Daejeon, 305-700, Republic of Korea
| | - Jin Sik Choi
- Creative Research Center for Graphene Electronics, ETRI (Electronics and Telecommunications Research Institute), Gajeongno, Yuseong-gu, Daejeon, 305-700, Republic of Korea
| | - Choon-Gi Choi
- Creative Research Center for Graphene Electronics, ETRI (Electronics and Telecommunications Research Institute), Gajeongno, Yuseong-gu, Daejeon, 305-700, Republic of Korea
| | - Jeong Young Park
- Center for Nanomaterials and Chemical Reactions, Institute for Basic Science (IBS), Daejeon 305-701, Korea. and Graduate School of EEWS, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 305-701, Korea
| |
Collapse
|
10
|
Shaikh A, Parida S, Böhm S. One step eco-friendly synthesis of Ag–reduced graphene oxide nanocomposite by phytoreduction for sensitive nitrite determination. RSC Adv 2016. [DOI: 10.1039/c6ra23655c] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
One step green synthesis of a silver–reduced graphene oxide nanocomposite (Ag–RGO) and its application to construct a nitrite (NO2−) sensor.
Collapse
Affiliation(s)
- Aasiya Shaikh
- Department of Metallurgical Engineering and Materials Science
- I.I.T. Bombay
- Mumbai
- India-400076
| | - Smrutiranjan Parida
- Department of Metallurgical Engineering and Materials Science
- I.I.T. Bombay
- Mumbai
- India-400076
| | | |
Collapse
|
11
|
Li X, Zhu J, Wei B. Hybrid nanostructures of metal/two-dimensional nanomaterials for plasmon-enhanced applications. Chem Soc Rev 2016; 45:3145-87. [DOI: 10.1039/c6cs00195e] [Citation(s) in RCA: 298] [Impact Index Per Article: 37.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
|
12
|
Spilarewicz-Stanek K, Kisielewska A, Ginter J, Bałuszyńska K, Piwoński I. Elucidation of the function of oxygen moieties on graphene oxide and reduced graphene oxide in the nucleation and growth of silver nanoparticles. RSC Adv 2016. [DOI: 10.1039/c6ra10483e] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The goal of the presented investigation was to study the differences in the decoration of graphene sheets, having various amounts of oxygen containing functional groups, with silver nanoparticles (AgNPs).
Collapse
Affiliation(s)
- Kaja Spilarewicz-Stanek
- University of Lodz
- Faculty of Chemistry
- Department of Materials Technology and Chemistry
- 90-236 Lodz
- Poland
| | - Aneta Kisielewska
- University of Lodz
- Faculty of Chemistry
- Department of Materials Technology and Chemistry
- 90-236 Lodz
- Poland
| | - Joanna Ginter
- University of Lodz
- Faculty of Chemistry
- Department of Materials Technology and Chemistry
- 90-236 Lodz
- Poland
| | - Karolina Bałuszyńska
- University of Lodz
- Faculty of Chemistry
- Department of Materials Technology and Chemistry
- 90-236 Lodz
- Poland
| | - Ireneusz Piwoński
- University of Lodz
- Faculty of Chemistry
- Department of Materials Technology and Chemistry
- 90-236 Lodz
- Poland
| |
Collapse
|
13
|
Kahnt A, Flyunt R, Laube C, Knolle W, Eigler S, Hermann R, Naumov S, Abel B. How fast is the reaction of hydrated electrons with graphene oxide in aqueous dispersions? NANOSCALE 2015; 7:19432-19437. [PMID: 26552902 DOI: 10.1039/c5nr03444b] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Understanding the mechanism of the reduction of graphene oxide (GO) is a key-question in graphene related materials science. Here, we investigate the kinetics of the reaction of radiolytically generated hydrated electrons with GO in water. The electron transfer proceeds on the ns time scale and not on the ps time scale, as recently reported by Gengler et al. (Nat. Commun., 2013, 4, 2560).
Collapse
Affiliation(s)
- Axel Kahnt
- Department of Chemistry and Pharmacy & Interdisciplinary Center for Molecular Materials, Chair of Physical Chemistry I, Friedrich-Alexander-Universitat Erlangen-Nürnberg, Egerlandstrasse 3, 91058 Erlangen, Germany.
| | - Roman Flyunt
- Leibniz Institute of Surface Modification (IOM), Chemical Department, Permoserstr. 15, 04318 Leipzig, Germany.
| | - Christian Laube
- Leibniz Institute of Surface Modification (IOM), Chemical Department, Permoserstr. 15, 04318 Leipzig, Germany.
| | - Wolfgang Knolle
- Leibniz Institute of Surface Modification (IOM), Chemical Department, Permoserstr. 15, 04318 Leipzig, Germany.
| | - Siegfried Eigler
- Department of Chemistry and Pharmacy, Institute of Advanced Materials and Processes (ZMP), Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Henkestr. 42, 91054 Erlangen and Dr.-Mack Str. 81, 90762 Fürth, Germany
| | - Ralf Hermann
- Wilhelm-Ostwald-Institute for Physical and Theoretical Chemistry, Faculty of Chemistry and Mineralogy, University of Leipzig, Permoserstr. 15, 04318 Leipzig, Germany
| | - Sergej Naumov
- Leibniz Institute of Surface Modification (IOM), Chemical Department, Permoserstr. 15, 04318 Leipzig, Germany.
| | - Bernd Abel
- Leibniz Institute of Surface Modification (IOM), Chemical Department, Permoserstr. 15, 04318 Leipzig, Germany. and Wilhelm-Ostwald-Institute for Physical and Theoretical Chemistry, Faculty of Chemistry and Mineralogy, University of Leipzig, Permoserstr. 15, 04318 Leipzig, Germany
| |
Collapse
|
14
|
Bhande SS, Ambade RB, Shinde DV, Ambade SB, Patil SA, Naushad M, Mane RS, Alothman ZA, Lee SH, Han SH. Improved Photoelectrochemical Cell Performance of Tin Oxide with Functionalized Multiwalled Carbon Nanotubes-Cadmium Selenide Sensitizer. ACS APPLIED MATERIALS & INTERFACES 2015; 7:25094-104. [PMID: 26334564 DOI: 10.1021/acsami.5b05385] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Here we report functionalized multiwalled carbon nanotubes (f-MWCNTs)-CdSe nanocrystals (NCs) as photosensitizer in photoelectrochemical cells, where f-MWCNTs were uniformly coated with CdSe NCs onto SnO2 upright standing nanosheets by using a simple electrodeposition method. The resultant blended photoanodes demonstrate extraordinary electrochemical properties including higher Stern-Volmer constant, higher absorbance, and positive quenching, etc., caused by more accessibility of CdSe NCs compared with pristine SnO2-CdSe photoanode. Atomic and weight percent changes of carbon with f-MWCNTs blending concentrations were confirmed from the energy dispersive X-ray analysis. The morphology images show a uniform coverage of CdSe NCs over f-MWCNTs forming a core-shell type structure as a blend. Compared to pristine CdSe, photoanode with f-MWCNTs demonstrated a 257% increase in overall power conversion efficiency. Obtained results were corroborated by the electrochemical impedance analysis. Higher scattering, more accessibility, and hierarchical structure of SnO2-f-MWCNTs-blend-CdSe NCs photoanode is responsible for higher (a) electron mobility (6.89 × 10(-4) to 10.89 × 10(-4) cm(2) V(-1) S(1-)), (b) diffusion length (27 × 10(-6)),
Collapse
Affiliation(s)
- Sambhaji S Bhande
- Center for Nanomaterials and Energy Devices, Swami Ramanand Teerth Marathwada University , Dnyanteerth, Vishnupuri, Nanded 431606, India
| | - Rohan B Ambade
- School of Semiconductor and Chemical Engineering, Chonbuk National University , 664-14, 1-ga Deokjin-dong, Deokjin-gu, Jeonju, Jeonbuk 561-756, Republic of Korea
| | - Dipak V Shinde
- Department of Chemistry, Hanyang University , , Seongdong-gu, Haengdang-dong 17, Seoul 133-791, Republic of Korea
| | - Swapnil B Ambade
- School of Semiconductor and Chemical Engineering, Chonbuk National University , 664-14, 1-ga Deokjin-dong, Deokjin-gu, Jeonju, Jeonbuk 561-756, Republic of Korea
| | - Supriya A Patil
- Department of Chemistry, Hanyang University , , Seongdong-gu, Haengdang-dong 17, Seoul 133-791, Republic of Korea
| | - Mu Naushad
- Department of Chemistry, College of Science, Bld-5, King Saud University , Riyadh, Saudi Arabia
| | - Rajaram S Mane
- Center for Nanomaterials and Energy Devices, Swami Ramanand Teerth Marathwada University , Dnyanteerth, Vishnupuri, Nanded 431606, India
- Department of Chemistry, Hanyang University , , Seongdong-gu, Haengdang-dong 17, Seoul 133-791, Republic of Korea
| | - Z A Alothman
- Department of Chemistry, College of Science, Bld-5, King Saud University , Riyadh, Saudi Arabia
| | - Soo-Hyoung Lee
- School of Semiconductor and Chemical Engineering, Chonbuk National University , 664-14, 1-ga Deokjin-dong, Deokjin-gu, Jeonju, Jeonbuk 561-756, Republic of Korea
| | - Sung-Hwan Han
- Department of Chemistry, Hanyang University , , Seongdong-gu, Haengdang-dong 17, Seoul 133-791, Republic of Korea
| |
Collapse
|
15
|
Girek B, Sliwa W. Hybrids of cationic porphyrins with nanocarbons. J INCL PHENOM MACRO 2015; 82:283-300. [PMID: 26167127 PMCID: PMC4491362 DOI: 10.1007/s10847-015-0485-z] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2015] [Accepted: 02/13/2015] [Indexed: 01/09/2023]
Abstract
In the review hybrids of cationic porphyrins (i.e. porphyrins functionalized by quaternary pyridinium groups) with nanocarbons such as fullerenes, carbon nanotubes and graphene are described. Selected examples of these species are characterized in regard of their properties and possible applications.
Collapse
Affiliation(s)
- Beata Girek
- Institute of Chemistry, Environmental Protection and Biotechnology, Jan Długosz University in Czestochowa, Armii Krajowej 13/15, 42-200 Czestochowa, Poland
| | - Wanda Sliwa
- Institute of Chemistry, Environmental Protection and Biotechnology, Jan Długosz University in Czestochowa, Armii Krajowej 13/15, 42-200 Czestochowa, Poland
| |
Collapse
|
16
|
Khan ME, Khan MM, Cho MH. Biogenic synthesis of a Ag–graphene nanocomposite with efficient photocatalytic degradation, electrical conductivity and photoelectrochemical performance. NEW J CHEM 2015. [DOI: 10.1039/c5nj01320h] [Citation(s) in RCA: 104] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Visible light-driven photocatalytic degradation of organic pollutants using the Ag–graphene nanocomposite.
Collapse
Affiliation(s)
| | - Mohammad Mansoob Khan
- Chemical Sciences
- Faculty of Science
- Universiti Brunei Darussalam
- Jalan Tungku LinK
- Brunei Darussalam
| | - Moo Hwan Cho
- School of Chemical Engineering
- Yeungnam University
- Gyeongsan-si
- South Korea
| |
Collapse
|
17
|
Saito A, Tsuji H, Shimoyama I, Shimizu KI, Nishina Y. Highly durable carbon-supported Pt catalysts prepared by hydrosilane-assisted nanoparticle deposition and surface functionalization. Chem Commun (Camb) 2015; 51:5883-6. [DOI: 10.1039/c4cc10298c] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Hydrosilane enabled the formation of Pt nanoparticles and the silane functionalization of a carbon support material in one pot.
Collapse
Affiliation(s)
- Akinori Saito
- Graduate School of Natural Science and Technology
- Okayama University
- Japan
| | - Hiromi Tsuji
- Research Core for Interdisciplinary Sciences
- Okayama University
- Japan
| | - Iwao Shimoyama
- Japan Atomic Energy Agency
- Quantum Beam Science Directorate
- Naka-gun
- Japan
| | | | - Yuta Nishina
- Research Core for Interdisciplinary Sciences
- Okayama University
- Japan
- Precursory Research for Embryonic Science and Technology
- Japan Science and Technology Agency
| |
Collapse
|
18
|
Alam R, Lightcap IV, Karwacki CJ, Kamat PV. Sense and shoot: simultaneous detection and degradation of low-level contaminants using graphene-based smart material assembly. ACS NANO 2014; 8:7272-8. [PMID: 24893206 DOI: 10.1021/nn502336x] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
Smart material nanoassemblies that can simultaneously sense and shoot low-level contaminants from air and water are important for overcoming the threat of hazardous chemicals. Graphene oxide (GO) sheets deposited on mesoscopic TiO2 films that underpin the deposition of Ag nanoparticles with UV irradiation provide the foundation for the design of a smart material. The Ag particle size is readily controlled through precursor concentration and UV irradiation time. These semiconductor–graphene oxide–metal (SGM) films are SERS-active and hence capable of sensing aromatic contaminants such as 4-nitrobenzenethiol (4-NBT) in nanomolar range. Increased local concentration of organic molecules achieved through interaction with 2-D carbon support (GO) facilitates low-level detection of contaminants. Upon UV irradiation of 4-NBT-loaded SGM film, one can induce photocatalytic transformations. Thus, each component of the SGM film plays a pivotal role in aiding the detection and degradation of a contaminant dispersed in aqueous solutions. The advantage of using SGM films as multipurpose “detect and destroy” systems for nitroaromatic molecules is discussed.
Collapse
|
19
|
Krishnamurthy S, Kamat PV. CdSe-Graphene Oxide Light-Harvesting Assembly: Size-Dependent Electron Transfer and Light Energy Conversion Aspects. Chemphyschem 2014; 15:2129-35. [DOI: 10.1002/cphc.201301189] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2014] [Indexed: 11/12/2022]
|
20
|
Som T, Troppenz GV, Wendt RR, Wollgarten M, Rappich J, Emmerling F, Rademann K. Graphene oxide/α-Bi(2)O(3) composites for visible-light photocatalysis, chemical catalysis, and solar energy conversion. CHEMSUSCHEM 2014; 7:854-865. [PMID: 24578169 DOI: 10.1002/cssc.201300990] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/17/2013] [Revised: 11/21/2013] [Indexed: 06/03/2023]
Abstract
The growing challenges of environmental purification by solar photocatalysis, precious-metal-free catalysis, and photocurrent generation in photovoltaic cells receive the utmost global attention. Here we demonstrate a one-pot, green chemical synthesis of a new stable heterostructured, ecofriendly, multifunctional microcomposite that consists of α-Bi2 O3 microneedles intercalated with anchored graphene oxide (GO) microsheets (1.0 wt %) for the above-mentioned applications on a large economical scale. The bare α-Bi2 O3 microneedles display two times better photocatalytic activities than commercial TiO2 (Degussa-P25), whereas the GO-hybridized composite exhibits approximately four to six times enhanced photocatalytic activities than the neat TiO2 photocatalyst in the degradation of colored aromatic organic dyes (crystal violet and rhodamine 6G) under visible-light irradiation (300 W tungsten lamp). The highly efficient activity is associated with the strong surface adsorption ability of GO for aromatic dye molecules, the high carrier acceptability, and the efficient electron-hole pair separation in Bi2 O3 by individual adjoining GO sheets. The introduction of Ag nanoparticles (2.0 wt %) further enhances the photocatalytic performance of the composite over eightfold because of a plasmon-induced electron-transfer process from Ag nanoparticles through the GO sheets into the conduction band of Bi2 O3 . The new composites are also catalytically active and catalyze the reduction of 4-nitrophenol to 4-aminophenol in the presence of borohydride ions. Photoanodes assembled from GO/α-Bi2 O3 and Ag/GO/α-Bi2 O3 composites display an improved photocurrent response (power conversion efficiency ∼20 % higher) over those prepared without GO in dye-sensitized solar cells.
Collapse
Affiliation(s)
- Tirtha Som
- Institut für Chemie, Humboldt-Universität zu Berlin, Brook-Taylor-Straße 2, 12489 Berlin (Germany).
| | | | | | | | | | | | | |
Collapse
|
21
|
Dar RA, Khare NG, Cole DP, Karna SP, Srivastava AK. Green synthesis of a silver nanoparticle–graphene oxide composite and its application for As(iii) detection. RSC Adv 2014. [DOI: 10.1039/c4ra00934g] [Citation(s) in RCA: 67] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
We report a facile and green synthetic approach to synthesize a silver nanoparticle (AgNPs)–graphene oxide (GO) composite using beta cyclodextrin as a stabilizing agent and ascorbic acid as a reducing agent.
Collapse
Affiliation(s)
- Riyaz Ahmad Dar
- Department of Chemistry
- University of Mumbai
- Mumbai-400098, India
| | - Ninad G. Khare
- Department of Chemistry
- University of Mumbai
- Mumbai-400098, India
| | - Daniel P. Cole
- US Army Research Laboratory
- Vehicle Technology Directorate, RDRL-VTM
- Aberdeen Proving Ground, USA
| | - Shashi P. Karna
- US Army Research Laboratory
- Weapons and Materials Research laboratory, RDRL-WM
- Aberdeen Proving Ground, USA
| | | |
Collapse
|
22
|
Martínez-Orozco RD, Rosu HC, Lee SW, Rodríguez-González V. Understanding the adsorptive and photoactivity properties of Ag-graphene oxide nanocomposites. JOURNAL OF HAZARDOUS MATERIALS 2013; 263 Pt 1:52-60. [PMID: 24035508 DOI: 10.1016/j.jhazmat.2013.07.056] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/09/2013] [Revised: 07/13/2013] [Accepted: 07/26/2013] [Indexed: 06/02/2023]
Abstract
Nanocomposites of graphene oxide (GO) and silver nanoparticles (AgNPs) were synthetized using a practical photochemical silver functionalization. Their photocatalytic activities were evaluated with two dyes, Rhodamine B and Indigo Carmine, under visible-light irradiation. The prepared nanocomposites were characterized by HRTEM, FESEM, XRD, Raman, FTIR and UV-vis absorption spectroscopy. These nanocomposites present new defect domains of sp(3) type in combination with several graphitic functional groups that act as nucleation sites for anchoring AgNPs, while the sp(2)-sp(3) edge defects domains of GO generate the photoactivity. Furthermore, their photocatalytic performances are governed by their large adsorption capacity, and strong interaction with dye chromophores. A comprehensive photocatalytic way underlying the importance of adsorption is suggested to explain the low visible-light responsive photoactivity of the AgNPs-GO nanocomposites and the possible binding-site saturation. Then, the usage of H2SO4 allows the production of ionic species and helps to confirm the strong adsorption of both dyes. The ability to synthesize AgNPs-GO nanocomposites with extensive adsorptive capacity is certainly of interest for the efficient removal of hazardous materials.
Collapse
Affiliation(s)
- R D Martínez-Orozco
- División de Materiales Avanzados, Instituto Potosino de Investigación Científica y Tecnológica, Camino a la Presa San José 2055, Col. Lomas 4a. sección, C.P. 78216 San Luis Potosí, S.L.P., Mexico
| | | | | | | |
Collapse
|
23
|
Lightcap IV, Kamat PV. Graphitic design: prospects of graphene-based nanocomposites for solar energy conversion, storage, and sensing. Acc Chem Res 2013. [PMID: 23194290 DOI: 10.1021/ar300248f] [Citation(s) in RCA: 153] [Impact Index Per Article: 13.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
Graphene not only possesses interesting electrochemical behavior but also has a remarkable surface area and mechanical strength and is naturally abundant, all advantageous properties for the design of tailored composite materials. Graphene-semiconductor or -metal nanoparticle composites have the potential to function as efficient, multifunctional materials for energy conversion and storage. These next-generation composite systems could possess the capability to integrate conversion and storage of solar energy, detection, and selective destruction of trace environmental contaminants or achieve single-substrate, multistep heterogeneous catalysis. These advanced materials may soon become a reality, based on encouraging results in the key areas of energy conversion and sensing using graphene oxide as a support structure. Through recent advances, chemists can now integrate such processes on a single substrate while using synthetic designs that combine simplicity with a high degree of structural and composition selectivity. This progress represents the beginning of a transformative movement leveraging the advancements of single-purpose chemistry toward the creation of composites designed to address whole-process applications. The promising field of graphene nanocomposites for sensing and energy applications is based on fundamental studies that explain the electronic interactions between semiconductor or metal nanoparticles and graphene. In particular, reduced graphene oxide is a suitable composite substrate because of its two-dimensional structure, outstanding surface area, and electrical conductivity. In this Account, we describe common assembly methods for graphene composite materials and examine key studies that characterize its excited state interactions. We also discuss strategies to develop graphene composites and control electron capture and transport through the 2D carbon network. In addition, we provide a brief overview of advances in sensing, energy conversion, and storage applications that incorporate graphene-based composites. With these results in mind, we can envision a new class of semiconductor- or metal-graphene composites sensibly tailored to address the pressing need for advanced energy conversion and storage devices.
Collapse
Affiliation(s)
- Ian V. Lightcap
- Radiation Laboratory and Departments of Chemistry and Biochemistry and Chemical & Biomolecular Engineering, University of Notre Dame, Notre Dame, Indiana 46556, United States
| | - Prashant V. Kamat
- Radiation Laboratory and Departments of Chemistry and Biochemistry and Chemical & Biomolecular Engineering, University of Notre Dame, Notre Dame, Indiana 46556, United States
| |
Collapse
|
24
|
Polavarapu L, Liz-Marzán LM. Towards low-cost flexible substrates for nanoplasmonic sensing. Phys Chem Chem Phys 2013; 15:5288-300. [PMID: 23303134 DOI: 10.1039/c2cp43642f] [Citation(s) in RCA: 214] [Impact Index Per Article: 19.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Plasmonic nanostructures have played a significant role in the field of nanotechnology due to their unprecedented ability to concentrate light at the nanometre scale, which renders them precious for various sensing applications. The adsorption of plasmonic nanoparticles and nanostructures onto solid substrates in a controlled manner is a crucial process for the fabrication of nanoplasmonic devices, in which the nanoparticles amplify the electromagnetic fields for enhanced device performance. In this perspective article we summarize recent developments in the fabrication of flexible nanoplasmonic devices for sensing applications based on surface enhanced Raman scattering (SERS) and localized surface plasmon resonance (LSPR) shifts. We introduce different types of flexible substrates such as filter paper, free-standing nanofibres, elastomers, plastics, carbon nanotubes and graphene, for the fabrication of low-cost flexible nanoplasmonic devices. Various techniques are described that allow impregnation of such flexible substrates with plasmonic nanoparticles, including solution processes, physical vapour deposition and lithographic techniques. From the discussion in this Perspective, it is clear that highly sensitive and reproducible flexible plasmonic devices can currently be fabricated on a large scale at relatively low-cost, toward real-world applications in diagnostics and detection.
Collapse
|
25
|
Akimov AV, Neukirch AJ, Prezhdo OV. Theoretical Insights into Photoinduced Charge Transfer and Catalysis at Oxide Interfaces. Chem Rev 2013; 113:4496-565. [DOI: 10.1021/cr3004899] [Citation(s) in RCA: 402] [Impact Index Per Article: 36.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Alexey V. Akimov
- Department of Chemistry, University of Rochester, Rochester, New York 14627,
United States
- Chemistry
Department, Brookhaven National Laboratory, Upton, New York 11973-5000,
United States
| | - Amanda J. Neukirch
- Department
of Physics and Astronomy, University of Rochester, Rochester, New York 14627,
United States
| | - Oleg V. Prezhdo
- Department of Chemistry, University of Rochester, Rochester, New York 14627,
United States
| |
Collapse
|
26
|
Murphy S, Huang L. Transient absorption microscopy studies of energy relaxation in graphene oxide thin film. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2013; 25:144203. [PMID: 23478941 DOI: 10.1088/0953-8984/25/14/144203] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Spatial mapping of energy relaxation in graphene oxide (GO) thin films has been imaged using transient absorption microscopy (TAM). Correlated AFM images allow us to accurately determine the thickness of the GO films. In contrast to previous studies, correlated TAM-AFM allows determination of the effect of interactions of GO with the substrate and between stacked GO layers on the relaxation dynamics. Our results show that energy relaxation in GO flakes has little dependence on the substrate, number of stacked layers, and excitation intensity. This is in direct contrast to pristine graphene, where these factors have great consequences in energy relaxation. This suggests intrinsic factors rather than extrinsic ones dominate the excited state dynamics of GO films.
Collapse
Affiliation(s)
- Sean Murphy
- Radiation Laboratory and Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, IN 46556, USA
| | | |
Collapse
|
27
|
Abstract
The recent surge in the utilization of semiconductor nanostructures for solar energy conversion has led to the development of high-efficiency solar cells. Some of these recent advances are in the areas of synthesis of new semiconductor materials and the ability to tune the electronic properties through size, shape, and composition and to assemble quantum dots as hybrid assemblies. In addition, processes such as hot electron injection, multiple exciton generation (MEG), plasmonic effects, and energy-transfer-coupled electron transfer are gaining momentum to overcome the efficiency limitations of energy capture and conversion. The recent advances as well as future prospects of quantum dot solar cells discussed in this perspective provide the basis for consideration as "The Next Big Thing" in photovoltaics.
Collapse
Affiliation(s)
- Prashant V Kamat
- Radiation Laboratory and Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556, United States
| |
Collapse
|
28
|
Bian X, Scanlon MD, Wang S, Liao L, Tang Y, Liu B, Girault HH. Floating conductive catalytic nano-rafts at soft interfaces for hydrogen evolution. Chem Sci 2013. [DOI: 10.1039/c3sc51290h] [Citation(s) in RCA: 72] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
|
29
|
Xu C, Yuan Y, Yuan R, Fu X. Enhanced photocatalytic performances of TiO2-graphene hybrids on nitro-aromatics reduction to amino-aromatics. RSC Adv 2013. [DOI: 10.1039/c3ra42579g] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
|
30
|
Mondal A, Sinha A, Saha A, Jana NR. Tunable Catalytic Performance and Selectivity of a Nanoparticle-Graphene Composite through Finely Controlled Nanoparticle Loading. Chem Asian J 2012; 7:2931-6. [DOI: 10.1002/asia.201200716] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2012] [Revised: 08/31/2012] [Indexed: 11/09/2022]
|