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Tin oxide nanoparticles (SnO2-NPs) synthesis using Galaxaura elongata and its anti-microbial and cytotoxicity study: a greenery approach. APPLIED NANOSCIENCE 2021. [DOI: 10.1007/s13204-021-01828-1] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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2
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Garín M, Khoury R, Martín I, Johnson EV. Direct etching at the nanoscale through nanoparticle-directed capillary condensation. NANOSCALE 2020; 12:9240-9245. [PMID: 32307480 DOI: 10.1039/c9nr10217e] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
We report a method to locally deliver a chemical etchant at the nanoscale in the vapor phase by capillary condensation forming a meniscus at the nanoparticle/substrate interface. The process is simple, scalable and does not require functionalization of the nanoparticles. Furthermore, it does not rely on any specific chemical properties of the materials other than the solution being aqueous and the wettability properties of the surfaces involved, which should enable its application to other material and chemical combinations. In particular, in this work we demonstrate the proposed process by periodically pattering a SiO2 layer using a self-assembled monolayer of polystyrene particles exposed to HF vapors. The patterned SiO2 layer is then used as a mask to etch a pattern of inverted nanopyramids on Si. The silicon nanopatterning has been demonstrated for particles sizes ranging from 800 nm down to 100 nm, providing pyramids with a size down to 50 nm for 100 nm nanoparticles.
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Affiliation(s)
- M Garín
- Grup de recerca en Micro i Nanotecnologies, Departament d'Enginyeria Electrònica, Universitat Politècnica de Catalunya, c/Jordi Girona Pascual 1-3, Barcelona 08034, Spain
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Sarathi Kannan D, Mahboob S, Al-Ghanim KA, Venkatachalam P. Antibacterial, Antibiofilm and Photocatalytic Activities of Biogenic Silver Nanoparticles from Ludwigia octovalvis. J CLUST SCI 2020. [DOI: 10.1007/s10876-020-01784-w] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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Medicinal Plant Leaf Extract and Pure Flavonoid Mediated Green Synthesis of Silver Nanoparticles and their Enhanced Antibacterial Property. Sci Rep 2017; 7:15867. [PMID: 29158537 PMCID: PMC5696514 DOI: 10.1038/s41598-017-15724-8] [Citation(s) in RCA: 278] [Impact Index Per Article: 39.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2017] [Accepted: 11/01/2017] [Indexed: 11/08/2022] Open
Abstract
The rewards of using plants and plant metabolites over other biological methods for nanoparticle synthesis have fascinated researchers to investigate mechanisms of metal ions uptake and bio-reduction by plants. Here, green chemistry were employed for the synthesis of silver nanoparticles (AgNPs) using leaf extracts of Ocimum Sanctum (Tulsi) and its derivative quercetin (flavonoid present in Tulsi) separately as precursors to investigate the role of biomolecules present in Tulsi in the formation of AgNPs from cationic silver under different physicochemical conditions such as pH, temperature, reaction time and reactants concentration. The size, shape, morphology, and stability of resultant AgNPs were investigated by optical spectroscopy (absorption, photoluminescence (PL), PL-lifetime and Fourier transform infrared), X-ray diffraction (XRD) analysis, and transmission electron microscopy (TEM). The enhanced antibacterial activity of AgNPs against E-Coli gram-negative bacterial strains was analyzed based on the zone of inhibition and minimal inhibitory concentration (MIC) indices. The results of different characterization techniques showed that AgNPs synthesized using both leaf extract and neat quercetin separately followed the same optical, morphological, and antibacterial characteristics, demonstrating that biomolecules (quercetin) present in Tulsi are mainly responsible for the reduction of metal ions to metal nanoparticles.
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Cui H, Hu D, Zhang J, Gao G, Chen Z, Li W, Gong P, Sheng Z, Cai L. Gold Nanoclusters-Indocyanine Green Nanoprobes for Synchronous Cancer Imaging, Treatment, and Real-Time Monitoring Based on Fluorescence Resonance Energy Transfer. ACS APPLIED MATERIALS & INTERFACES 2017; 9:25114-25127. [PMID: 28675030 DOI: 10.1021/acsami.7b06192] [Citation(s) in RCA: 51] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Well-designed gold nanoclusters-indocyanine green nanoprobes (Au NCs-INPs) have been developed by the conjugation of Au NC assemblies with indocyanine green (ICG) for the therapeutic real-time monitoring based on fluorescence resonance energy transfer (FRET). The synthesized Au NCs-INPs demonstrated the improved cellular uptake and effective tumor targeting because of the enhanced permeability and retention effect and the gp60-mediated secreted protein acidic and rich in cysteine combined transport pathway, suggesting excellent dual-modal near-infrared fluorescence and photoacoustic imaging. Moreover, the simultaneous photodynamic therapy (PDT) and photothermal therapy (PTT) of Au NCs-INPs exhibited higher cancer cell killing and tumor removal efficiency than those of PDT or PTT alone. More importantly, a promising therapeutic monitoring strategy was performed based on FRET between Au NCs and ICG, suggesting that Au NCs-INPs could be utilized to evaluate the therapeutic response by real-time monitoring the change in Au NCs in fluorescence intensity together with ICG supersession. Therefore, Au NCs-INPs as a novel photosensitizer have great potentials for combined tumor imaging, therapy, and therapeutic monitoring in real time.
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Affiliation(s)
| | | | | | - Guanhui Gao
- Paul-Drude-Institut für Festkörperelektronik , Berlin 10117, Germany
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Kolya H, Maiti P, Pandey A, Tripathy T. Green synthesis of silver nanoparticles with antimicrobial and azo dye (Congo red) degradation properties using Amaranthus gangeticus Linn leaf extract. J Anal Sci Technol 2015. [DOI: 10.1186/s40543-015-0074-1] [Citation(s) in RCA: 88] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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7
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Electrochemical synthesis, characterisation and phytogenic properties of silver nanoparticles. APPLIED NANOSCIENCE 2015. [DOI: 10.1007/s13204-014-0396-0] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Ogawa K, Dy J, Maeda R, Nagatsuka Y, Kamada K, Kobuke Y. Synthesis and photophysical properties of a porphyrin-perinaphthothioindigo dye. J PORPHYR PHTHALOCYA 2013. [DOI: 10.1142/s1088424613500521] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
A new porphyrin-perinaphthothioindigo composite, where porphyrin and perinaphthothioindigo dye are connected though a triple bond, was synthesized. In UV-vis absorption spectra of the composite, absorption originating from the trans-isomer appeared at 655 nm. Upon photoirradiation at > 700 nm, the intensity of this absorption decreased with increase of absorption of the cis-isomer around at 530 nm. The HOMO–LUMO absorption of the cis-isomer is blue-shifted by 125 nm compared to that of trans-isomer due to the lack of π-conjugation. The 2PA cross-section values obtained for both isomers were 2,000 and 700 GM, respectively. The value of 2,000 GM is of the largest class among the values reported for photochromic compounds. The enhancement factors by the connection of porphyrin to perinaphthothioindigo were found to be 3.5–3.9 by measuring cross-section values of bis(TMS-ethynyl)perinaphthothioindigo as the reference compound. Two-photon isomerization of the trans-isomer to the cis-isomer was successfully conducted using femtosecond pulses.
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Affiliation(s)
- Kazuya Ogawa
- Graduate School of Materials Science, Nara Institute of Science and Technology, 8916-5 Takayama, Ikoma, Nara 630-0101, Japan
| | - Joanne Dy
- Graduate School of Materials Science, Nara Institute of Science and Technology, 8916-5 Takayama, Ikoma, Nara 630-0101, Japan
| | - Rena Maeda
- Graduate School of Materials Science, Nara Institute of Science and Technology, 8916-5 Takayama, Ikoma, Nara 630-0101, Japan
| | - Yasunori Nagatsuka
- Graduate School of Materials Science, Nara Institute of Science and Technology, 8916-5 Takayama, Ikoma, Nara 630-0101, Japan
| | - Kenji Kamada
- Research Institute for Ubiquitous Energy Devices, National Institute of Advanced Industrial Science and Technology (AIST), 1-8-31 Midorigaoka, Ikeda, Osaka 563-8577, Japan
| | - Yoshiaki Kobuke
- Graduate School of Materials Science, Nara Institute of Science and Technology, 8916-5 Takayama, Ikoma, Nara 630-0101, Japan
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Rodríguez-León E, Iñiguez-Palomares R, Navarro RE, Herrera-Urbina R, Tánori J, Iñiguez-Palomares C, Maldonado A. Synthesis of silver nanoparticles using reducing agents obtained from natural sources (Rumex hymenosepalus extracts). NANOSCALE RESEARCH LETTERS 2013; 8:318. [PMID: 23841946 PMCID: PMC3716778 DOI: 10.1186/1556-276x-8-318] [Citation(s) in RCA: 116] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/12/2013] [Accepted: 05/30/2013] [Indexed: 05/21/2023]
Abstract
We have synthesized silver nanoparticles from silver nitrate solutions using extracts of Rumex hymenosepalus, a plant widely found in a large region in North America, as reducing agent. This plant is known to be rich in antioxidant molecules which we use as reducing agents. Silver nanoparticles grow in a single-step method, at room temperature, and with no addition of external energy. The nanoparticles have been characterized by ultraviolet-visible spectroscopy and transmission electron microscopy, as a function of the ratio of silver ions to reducing agent molecules. The nanoparticle diameters are in the range of 2 to 40 nm. High-resolution transmission electron microscopy and fast Fourier transform analysis show that two kinds of crystal structures are obtained: face-centered cubic and hexagonal.
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Affiliation(s)
- Ericka Rodríguez-León
- Departamento de Investigación en Física, Universidad de Sonora, Hermosillo, Sonora 83000, México
| | - Ramón Iñiguez-Palomares
- Departamento de Física, Universidad de Sonora, Apartado Postal 1626, Hermosillo, Sonora 83000, México
| | - Rosa Elena Navarro
- Departamento de Investigación en Polímeros y Materiales, Universidad de Sonora, Hermosillo, Sonora 83000, México
| | - Ronaldo Herrera-Urbina
- Departamento de Ingeniería Química y Metalurgia, Universidad de Sonora, Hermosillo, Sonora 83000, México
| | - Judith Tánori
- Departamento de Investigación en Polímeros y Materiales, Universidad de Sonora, Hermosillo, Sonora 83000, México
| | | | - Amir Maldonado
- Departamento de Física, Universidad de Sonora, Apartado Postal 1626, Hermosillo, Sonora 83000, México
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Ogawa K, Dy J, Kobuke Y. Substituent effect on two-photon absorption properties of conjugated porphyrins. J PORPHYR PHTHALOCYA 2012. [DOI: 10.1142/s1088424605000848] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Two-photon absorption (2PA) cross section values of bisacetylene-connected bisporphyrins were measured by using a nanosecond open aperture Z-scan method. The maximum effective cross section values of alkyl and aryl meso-substituted bisporphyrins were 14,000 GM at 890 nm and 7,700 GM at 860 nm, respectively, and the value of alkyl-substituted bisporphyrin was almost twice of that of aryl-substituted one. In one-photon absorption spectra, Q-bands of alkyl-substituted bisporphyrin were red-shifted at 635 nm and 685 nm, and intensified compared with those of aryl-substituted one at 625 nm and 678 nm, respectively, indicating higher π-electron density of the former compound compared to that of the later. The large enhancement observed for alkyl-substituted bisporphyrin is attributed to the increase in π- electron density compared with aryl-substituted one. It was found that the alkyl group is better to obtain large 2PA cross section values than the aryl group as the meso-substituent of the porphyrin.
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Affiliation(s)
- Kazuya Ogawa
- Graduate School of Materials Science, Nara Institute of Science and Technology, 8916-5 Takayama, Ikoma, Nara 630-0101, Japan
| | - Joanne Dy
- Graduate School of Materials Science, Nara Institute of Science and Technology, 8916-5 Takayama, Ikoma, Nara 630-0101, Japan
| | - Yoshiaki Kobuke
- Graduate School of Materials Science, Nara Institute of Science and Technology, 8916-5 Takayama, Ikoma, Nara 630-0101, Japan
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Abstract
A new porphyrintetrathiafulvalene composite, where two porphyrins are bridged by te trathiafulvalene (TTF) using acetylene bonds was synthesized. The Q-band of the monomeric porphyrin appears at 590 nm whereas that of the composite is red-shifted to 620 nm and intensified. The Soret band is also red-shifted from 427 nm to 435 nm and much broadened, indicating the expansion of π-conjugation over the porphyrin and tetrathiafulvalene units. The HOMOs and LUMOs were calculated using time-dependent density functional theory. Voltammetric experiments revealed that the first oxidation potential of the TTF moiety in the composite was shifted by +155 mV compa red with TTF in the absence of composite. The effective two-photon absorption (2PA) cross section values were measured by using a nanosecond open aperture Z-scan method. The maximum effective 2PA cross section values were obtained at 760 nm, as 7300 GM in benzonitrile and 5900 GM in toluene. The values obtained in the polar solvent were 1.2 to 1.5 times larger than those in the nonpolar solvent.
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Affiliation(s)
- Kazuya Ogawa
- Graduate School of Materials Science, Nara Institute of Science and Technology, 8916-5 Takayama, Ikoma, Nara 630-0101, Japan
| | - Yasunori Nagatsuka
- Graduate School of Materials Science, Nara Institute of Science and Technology, 8916-5 Takayama, Ikoma, Nara 630-0101, Japan
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Song Y, Zhang Z, Elsayed-Ali HE, Wang H, Henry LL, Wang Q, Zou S, Zhang T. Identification of single nanoparticles. NANOSCALE 2011; 3:31-44. [PMID: 20949213 DOI: 10.1039/c0nr00412j] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
The physicochemical properties of nanomaterials significantly depend on their three-dimensional (3D) morphologies (sizes, shapes and surface topography), the surrounding media, and their spatial arrangement. Systematically and precisely correlating these parameters with the related physicochemical properties of specific single nanoparticles (NPs) is a fundamental requirement for the discovery of their novel properties and applications, as well as for advancing the fundamental and practical knowledge required for the design and fabrication of new materials. In this article, the progress in the identification of the specific individual NP is summarized, including the in situ methods and the spatial-localization methods based on plasmonic NPs as model. Identification of single NPs based on local surface plasmon resonance observed by fluorescent inverted optical microscopy, dark-field microscopy, scanning near-field optical microscopy, atomic force microscopy, and transmission electron microscope are reviewed. Recent progress in the investigation of 3D morphology-dependent optical properties by these methods is described. Experimental and theoretical developments in single-NP identification for the purpose of understanding the physicochemical properties are discussed.
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Affiliation(s)
- Yujun Song
- Key Laboratory for Aerospace Materials and Performance, Education of Ministry, School of Materials Science and Engineering, Beihang University, Beijing, 100191, China.
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Nallathamby PD, Huang T, Xu XHN. Design and characterization of optical nanorulers of single nanoparticles using optical microscopy and spectroscopy. NANOSCALE 2010; 2:1715-22. [PMID: 20820702 PMCID: PMC2946254 DOI: 10.1039/c0nr00303d] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
Current conventional imaging methods cannot determine sizes of single nanoparticles (NPs) in solution and living organisms at the nanometre scale, which limits the applications of NPs. In this study, we developed new imaging calibration approaches to characterize the sizes of single Ag NPs in solution at nanometre resolution by measuring their size-dependent scattering localized-surface-plasmon-resonance (LSPR) spectra and scattering intensity using dark-field optical microscopy and spectroscopy (DFOMS). We synthesized nearly spherical shape Ag NPs, ranging from 2 to 110 nm in diameter, and characterized the sizes of single NPs using high-resolution transmission electron microscopy, and the LSPR spectra and scattering intensity of single NPs using DFOMS. We constructed calibration curves of the peak wavelength (lambda(max)) of LSPR spectra or scattering intensity of single NPs versus their sizes. These calibration curves allow us to determine the sizes of single NPs at 1 nm resolution by measuring the LSPR spectra or scattering intensity of single NPs using DFOMS. These new approaches enable us to create optical nanorulers (calibration curves) of single Ag NPs for simultaneously imaging and measuring sizes of multiple single NPs in solution in real time at nanometre resolution using optical microscopy. One can now use these new imaging calibration approaches to study and characterize single NPs in solution and living organisms in real time for a wide variety of applications.
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Affiliation(s)
| | - Tao Huang
- Department of Chemistry and Biochemistry, Old Dominion University, Norfolk, VA 23529
| | - Xiao-Hong Nancy Xu
- Department of Chemistry and Biochemistry, Old Dominion University, Norfolk, VA 23529
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14
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Song Y, Nallathamby PD, Huang T, Elsayed-Ali HE, Xu XHN. Correlation and Characterization of 3D Morphological Dependent Localized Surface Plasmon Resonance Spectra of Single Silver Nanoparticles Using Dark-field Optical Microscopy and Spectroscopy and AFM. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2010; 114:74-81. [PMID: 20190865 PMCID: PMC2826799 DOI: 10.1021/jp9083019] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
We have developed a new and effective methodology to correlate optical and AFM images of single Ag nanoparticles (NPs), allowing us to study 3D-morphological dependent localized surface plasmon resonance (LSPR) spectra of individual Ag NPs. We fabricated arrays of distinctive microwindows on glass coverslips using photo-lithography method, and created well-isolated individual Ag NPs with a wide variety of shapes and morphologies on the glass coverslips using a modified nanosphere lithography method (NSL). Using distinctive geometries of microwindows, we located individual Ag NPs of interest in their optical and AFM images, enabling us to correlate and characterize the LSPR spectra and 3D morphologies of the same single NPs using dark-field optical microscopy and spectroscopy (DFOMS) and AFM, respectively. We found that LSPR spectra of single Ag NPs, with nearly equal volume [(8.6 ± 0.4) × 10(3) nm(3)], cross-section [(2.2 ± 0.2) × 10(2) nm(3)], and height (39.6 ± 3.6 nm), highly depend on their shapes, showing the red shift of peak wavelength to 629 nm (quasi trapezoidal cylindrical NP) from that of 506 nm (quasi circular cylindrical NP). LSPR spectra of single Ag NPs simulated using discrete dipole approximation (DDA) agree well with those measured experimentally when their shapes and morphologies can be accuractely described in both methods, but differ when they are not. Furthermore, we found location-dependent LSPR spectra on and around a single NP, offering a unique opportunity to characterize multi-mode plasmonic NPs at nanometer resolution for better understanding their plasmonic optical properties and for rational design of single NP optics.
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Affiliation(s)
- Yujun Song
- Department of Chemistry and Biochemistry, Old Dominion University, Norfolk, VA 23529
- Applied Research Center and Department of Electrical and Computer Engineering, Old Dominion University, Norfolk, VA 23529
| | | | - Tao Huang
- Department of Chemistry and Biochemistry, Old Dominion University, Norfolk, VA 23529
| | - Hani E. Elsayed-Ali
- Applied Research Center and Department of Electrical and Computer Engineering, Old Dominion University, Norfolk, VA 23529
| | - Xiao-Hong Nancy Xu
- Department of Chemistry and Biochemistry, Old Dominion University, Norfolk, VA 23529
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Chaudhuri D, Galusha JW, Walter MJ, Borys NJ, Bartl MH, Lupton JM. Toward subdiffraction transmission microscopy of diffuse materials with silver nanoparticle white-light beacons. NANO LETTERS 2009; 9:952-956. [PMID: 19193157 DOI: 10.1021/nl802819n] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
We demonstrate high resolution transmission microscopy in a conventional two-photon wide-field fluorescence microscope by exploiting nonlinear white light generation from clusters of silver nanoparticles placed beneath the specimen. Surface-enhanced two-photon luminescence occurs at nanoparticle hot spots in the form of spectrally broad, spatially confined light which can be exploited to determine the transmission properties of a sample placed on the silver nanoparticles. We demonstrate the versatility of the technique by revealing individual crystalline domains formed in the diffuse biological photonic crystals of the scales of a beetle. We can identify submicron changes between photonic crystal facets as well as the occurrence of stacked domains invisible to surface-sensitive methods. Control over wavelength, polarization, and pulse shape promises selective addressing of hot spots in nanoparticle assemblies for motionless spatial scanning of the transmission properties with subdiffraction resolution.
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Affiliation(s)
- Debansu Chaudhuri
- Department of Physics and Department of Chemistry, University of Utah, Salt Lake City, Utah 84112, USA
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Ogawa K, Kobuke Y. Design of two-photon absorbing materials for molecular optical memory and photodynamic therapy. Org Biomol Chem 2009; 7:2241-6. [DOI: 10.1039/b901422e] [Citation(s) in RCA: 62] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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17
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Karan S, Mallik B. Nanostructured organic-inorganic photodiodes with high rectification ratio. NANOTECHNOLOGY 2008; 19:495202. [PMID: 21730664 DOI: 10.1088/0957-4484/19/49/495202] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
High quality organic-inorganic heterojunction photodiodes based on nanostructured copper (II) phthalocyanine (CuPc) and intrinsic zinc oxide (i-ZnO) have been fabricated. The i-ZnO thin films/layers were grown by RF magnetron sputtering on clean indium tin oxide (ITO) coated glass substrates. These films have been characterized by optical absorption and field emission scanning electron microscopy (FESEM). CuPc thin films deposited at room temperature on i-ZnO have exhibited a change in their surface morphology with the post-deposition annealing temperature under normal atmosphere. The electrical dark conductivity and the photoconductivity of ITO/i-ZnO/CuPc/Au sandwich structures have been measured under various photoexcitation intensities using a xenon light source. The devices have shown excellent reproducibility of their electrical characteristics and high rectification ratios. The highest rectification ratio is nearly 831 calculated above the threshold voltage at room temperature for the sample annealed at 250 °C (i.e. Pc 250). The effects of the annealing temperature of CuPc on the surface morphology, rectification ratio, and optical properties have been discussed.
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Affiliation(s)
- Santanu Karan
- Department of Spectroscopy, Indian Association for the Cultivation of Science, 2A & 2B, Raja S C Mullick Road, Jadavpur, Kolkata-700 032, India
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Senanayake V, Juurlink BH, Zhang C, Zhan E, Wilson LD, Kwon J, Yang J, Lim ZL, Brunet SMK, Schatte G, Maley JM, Hoffmeyer RE, Sammynaiken R. Do Surface Defects and Modification Determine the Observed Toxicity of Carbon Nanotubes? J Biomed Nanotechnol 2008. [DOI: 10.1166/jbn.2008.017] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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19
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Stroyuk AL, Shvalagin VV, Raevskaya AE, Kryukov AI, Kuchmii SY. Photochemical formation of semiconducting nanostructures. THEOR EXP CHEM+ 2008. [DOI: 10.1007/s11237-008-9037-6] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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20
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Dy J, Ogawa K, Kamada K, Ohta K, Kobuke Y. Stepwise elongation effect on the two-photon absorption of self-assembled butadiyne porphyrins. Chem Commun (Camb) 2008:3411-3. [DOI: 10.1039/b804056g] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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21
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Wu C, Peng H, Jiang Y, McNeill J. Energy transfer mediated fluorescence from blended conjugated polymer nanoparticles. J Phys Chem B 2007; 110:14148-54. [PMID: 16854113 DOI: 10.1021/jp0618126] [Citation(s) in RCA: 178] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Nanoparticles consisting of a derivative of the blue-emitting conjugated polymer polyfluorene doped with green-, yellow-, and red-emitting conjugated polymers were prepared by a reprecipitation method. The nanoparticles can be described as a system of densely packed chromophores that exhibit efficient energy transfer from the host to the dopant polymers. Fluorescence quenching analysis of the host polymer as a function of the dopant concentration indicates that one energy acceptor molecule can effectively quench 90% of the fluorescence of a nanoparticle consisting of 100-200 host conjugated polymer molecules. A nanoparticle energy transfer model was developed that successfully describes the quenching behavior of a small number of highly efficient energy acceptors per nanoparticle. The fluorescence brightness of the blended polymer nanoparticles was determined to be much higher than that of inorganic quantum dots and dye-loaded silica particles of similar dimensions. The combination of high fluorescence brightness and tunable fluorescence of these blended nanoparticles is promising for ultrasensitive fluorescence-based assays.
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Affiliation(s)
- Changfeng Wu
- Department of Chemistry and Center for Optical Materials Science and Engineering Technologies, Clemson University, Clemson, SC 29634, USA
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Chen X, Song Z, Hu L, Zhang J, Wen L. Experimental study on a nonlinear photonics process of Er(0.5)Yb(3):FOV oxyfluoride nanophase vitroceramics. OPTICS LETTERS 2007; 32:2019-21. [PMID: 17632629 DOI: 10.1364/ol.32.002019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
We study the nonlinear photonics of rare-earth-doped oxyfluoride nanophase vitroceramics (FOV), oxyfluoride glass (FOG), and ZBLAN fluoride glass. We found that an interesting fluorescence intensity inversion phenomenon between red and green fluorescence occurs from Er(0.5)Yb(3):FOV. The dynamic range summation operator of the intensity inversion between red and green fluorescence of Er(0.5)Yb(3):FOV is about 5.753 x 10(2), which is 100 to 1000 times larger than those of other materials. One of the applications of this phenomenon is double-wavelength fluorescence falsification-preventing technology, which is proved to possess the novel antifriction loss and antiscribble properties.
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Affiliation(s)
- Xiaobo Chen
- Applied Optics Beijing Area Major Laboratory, Analysis and Testing Center and Physics Department, Beijing Normal University, Beijing 100875, China.
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Dy JT, Ogawa K, Satake A, Ishizumi A, Kobuke Y. Water-Soluble Self-Assembled Butadiyne-Bridged Bisporphyrin: A Potential Two-Photon-Absorbing Photosensitizer for Photodynamic Therapy. Chemistry 2007; 13:3491-500. [PMID: 17225219 DOI: 10.1002/chem.200601205] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
We have synthesized a novel, two-photon-absorbing photosensitizer for two-photon-absorption photodynamic therapy (2PA-PDT). The molecule is a butadiyne-bridged porphyrin dimer terminated with two water-soluble porphyrin monomers connected through Zn-imidazolyl self-assembly and covalently linked through olefin metathesis. It has an effective two-photon-absorption (2PA) cross-section value, sigma((2)), of 33 000+/-4600 GM with 5-ns pulses at 890 nm measured by using the open-aperture Z-scan technique. The compound was found to generate singlet oxygen, cytotoxic for tumor cells in photodynamic therapy (PDT), under 2PA conditions by conducting photobleaching experiments with anthracene-9,10-dipropionic acid sodium salt (ADPA).
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Affiliation(s)
- Joanne T Dy
- Graduate School of Materials Science, Nara Institute of Science and Technology, 8916-5 Takayama, Ikoma, Nara 630-0101, Japan
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Affiliation(s)
- Michael Z. Asuncion
- Department of Materials Science and Engineering and Macromolecular Science and Engineering Center, University of Michigan, Ann Arbor, Michigan 48109-2136
| | - Richard M. Laine
- Department of Materials Science and Engineering and Macromolecular Science and Engineering Center, University of Michigan, Ann Arbor, Michigan 48109-2136
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Liu H, Edel JB, Bellan LM, Craighead HG. Electrospun polymer nanofibers as subwavelength optical waveguides incorporating quantum dots. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2006; 2:495-9. [PMID: 17193073 DOI: 10.1002/smll.200500432] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Affiliation(s)
- Haiqing Liu
- School of Applied and Engineering Physics and Nanobiotechnology Center, Cornell University, Ithaca, NY 14853, USA
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Precipitation of nanocomposite particles from a multi-component, rapidly expanding supercritical solution. J Supercrit Fluids 2006. [DOI: 10.1016/j.supflu.2005.08.012] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Mu J, Xu L, Li X, Xu Z, Wei Q, Sun H, Kang S. Photoluminescence Properties of Silica Xerogels Co‐doped with Eu3+Ions and CdS Nanoparticles. J DISPER SCI TECHNOL 2006. [DOI: 10.1080/01932690500267181] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Tanihara J, Ogawa K, Kobuke Y. Two-photon absorption properties of conjugated supramolecular porphyrins with electron donor and acceptor. J Photochem Photobiol A Chem 2006. [DOI: 10.1016/j.jphotochem.2005.10.042] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Ogawa K, Ohashi A, Kobuke Y, Kamada K, Ohta K. Two-Photon Absorption Properties of Self-Assemblies of Butadiyne-Linked Bis(Imidazolylporphyrin). J Phys Chem B 2005; 109:22003-12. [PMID: 16853858 DOI: 10.1021/jp054444z] [Citation(s) in RCA: 83] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Supramolecular porphyrin self-assemblies have been prepared from butadiyne-linked bis(imidazolylporphyrin) by complementary coordination of imidazole to zinc, and their two-photon absorption (2PA) and higher-order nonlinear absorption properties were investigated over femtosecond time scales using an open-aperture Z-scan method. The self-assembled porphyrin dimer of the conjugated monozinc bisporphyrin 7D was shown to have a large 2PA cross section (7.6 x 10(3) GM, where 1 GM = 10(-50) cm(4) s molecule(-1) photon(-1)) at 887 nm. By comparison of this result with that for a meso-meso-linked porphyrin array without the butadiyne connection (3.7 x 10(2) GM at 964 nm), it was demonstrated that the predominant factor in this significant enhancement of the cross section was the expansion of porphyrin-porphyrin pi-conjugation. Self-coordination and monozinc metalation were also found to be contributing factors. Furthermore, a novel self-assembled porphyrin polymer 8P consisting of a biszinc complex with a mean molecular weight of M(n) = 1.5 x 10(5) Da was shown to exhibit an extraordinarily large two-photon absorption cross section (4.4 x 10(5) GM at 873 nm). Nanosecond Z-scan experiments for 7D and 8P were also undertaken and resulted in the measurement of large effective 2PA cross sections, including the excited-state absorption (2.1 x 10(5) GM for 7D and 2.2 x 10(7) GM for 8P, respectively). Finally, three-photon absorption was observed by femtosecond Z-scan experiments at 1188 nm (7.1 x 10(-89) m(6) s(2)) and 1282 nm (1.8 x 10(-89) m(6) s(2)), an observation which is the first of its kind in porphyrin chemistry.
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Affiliation(s)
- Kazuya Ogawa
- Graduate School of Materials Science, Nara Institute of Science and Technology, 8916-5 Takayama, Ikoma, Nara 630-0101, Japan
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Rakov N, Maciel GS. Enhancement of luminescence efficiency of f–f transitions from Tb3+ due to energy transfer from Ce3+ in Al2O3 crystalline ceramic powders prepared by low temperature direct combustion synthesis. Chem Phys Lett 2004. [DOI: 10.1016/j.cplett.2004.11.015] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Some spectroscopic properties of gold nanorods according to a schematic quantum model founded on the dielectric behavior of the electron-gas confined in a box. I. Chem Phys 2003. [DOI: 10.1016/s0301-0104(03)00189-7] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Giani E, Sparnacci K, Laus M, Palamone G, Kapeliouchko V, Arcella V. PTFE−Polystyrene Core−Shell Nanospheres and Nanocomposites. Macromolecules 2003. [DOI: 10.1021/ma0259970] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Nanospray mass spectrometry technique for analysing nanomaterials from molecular precursors up to 1.5 nm in diameter cluster. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2002. [DOI: 10.1016/s0928-4931(01)00403-9] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Lu CH, Hong HC, Jagannathan R. Sol–gel synthesis and photoluminescent properties of cerium-ion doped yttrium aluminium garnet powders. ACTA ACUST UNITED AC 2002. [DOI: 10.1039/b200776m] [Citation(s) in RCA: 102] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Dhanaraj J, Jagannathan R, Kutty TRN, Lu CH. Photoluminescence Characteristics of Y2O3:Eu3+ Nanophosphors Prepared Using Sol−Gel Thermolysis. J Phys Chem B 2001. [DOI: 10.1021/jp0119330] [Citation(s) in RCA: 292] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- J. Dhanaraj
- Luminescence Group, CECRI, Karaikudi 630006 (T.N), India, Materials Research Center, I.I.Sc, Banaglore 560012, India, and Department of Chemical Engineering, National Taiwan University, Taipei 106 Taiwan, R.O.C
| | - R. Jagannathan
- Luminescence Group, CECRI, Karaikudi 630006 (T.N), India, Materials Research Center, I.I.Sc, Banaglore 560012, India, and Department of Chemical Engineering, National Taiwan University, Taipei 106 Taiwan, R.O.C
| | - T. R. N. Kutty
- Luminescence Group, CECRI, Karaikudi 630006 (T.N), India, Materials Research Center, I.I.Sc, Banaglore 560012, India, and Department of Chemical Engineering, National Taiwan University, Taipei 106 Taiwan, R.O.C
| | - Chung-Hsin Lu
- Luminescence Group, CECRI, Karaikudi 630006 (T.N), India, Materials Research Center, I.I.Sc, Banaglore 560012, India, and Department of Chemical Engineering, National Taiwan University, Taipei 106 Taiwan, R.O.C
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Shen Y, Markowicz P, Winiarz J, Swiatkiewicz J, Prasad PN. Nanoscopic study of second-harmonic generation in organic crystals with collection-mode near-field scanning optical microscopy. OPTICS LETTERS 2001; 26:725-727. [PMID: 18040433 DOI: 10.1364/ol.26.000725] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Collection-mode near-field scanning optical microscopy (NSOM) is used to map nanoscopic second-harmonic generation (SHG) in N -(4-nitrophenyl)- (L) -prolinol crystals. A spatial resolution of 98 nm is achieved. Near-field polarization-dependent SHG measurement is performed, and a local effective SHG susceptibility of 224+/-18 pm/V is obtained.
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