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Au–TiO2 Core Shell Motif Scavenger: Facile Synthesis, High SERS Effect, Synergistic Photocatalytic Activity. J CLUST SCI 2018. [DOI: 10.1007/s10876-018-1401-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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2
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Li Y, Pan G, Liu Q, Ma L, Xie Y, Zhou L, Hao Z, Wang Q. Coupling Resonances of Surface Plasmon in Gold Nanorod/Copper Chalcogenide Core-Shell Nanostructures and Their Enhanced Photothermal Effect. Chemphyschem 2018; 19:1852-1858. [PMID: 29863808 DOI: 10.1002/cphc.201701338] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2017] [Indexed: 01/08/2023]
Abstract
Dual plasmonic Au@Cu2-x S core-shell nanorods (NRs) have been fabricated by using a hydrothermal method and plasmon-coupled effect between the Au core and Cu2-x S shell in the near-infrared (NIR) region. The extinction spectrum of Au@Cu2-x S NRs is dominated by the surface plasmon resonance (SPR) of the Cu2-x S shell, the transverse surface plasmon resonance (TSPR), and the longitudinal surface plasmon resonance (LSPR) of the Au NRs. With the Cu2-x S shell increasing (fixed Au NRs), the TSPR peak slightly redshifts and the LSPR and SPR peaks blueshift, owing to competition between the redshift of the refractive index effect and blueshift from the plasmon coupled effect. Although, for Au@Cu2 S NRs, only TSPR and LSPR peaks can be seen and a redshift arises with the increasing Cu2 S shell thickness, implying that no plasmonic coupling between Au NRs and Cu2 S shell occurred. The extinction spectrum of the Au@Cu2-x S NRs with three coupled resonance peaks is simulated by using the FDTD method, taking into account the electron-transfer effect. The dispersion properties of the coupling of Au@Cu2-x S NRs with the LSPR of the initial Au core are studied experimentally by changing the length of the Au NRs, which are explained theoretically by the coupled harmonic oscillator model. The calculated coupled coefficients between SPR of the Cu2-x S shell and LSPR of the Au NRs is 180 meV, which is much stronger than that of TSPR of Au NRs of 55 meV. Finally, the enhanced photothermal effect of Au@Cu2-x S NRs has been demonstrated.
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Affiliation(s)
- Yingying Li
- Department School of Physics and Technology, Wuhan University, Wuhan, 430072, P. R. China
| | - Guiming Pan
- Department School of Physics and Technology, Wuhan University, Wuhan, 430072, P. R. China
| | - Qiyu Liu
- Department School of Physics and Technology, Wuhan University, Wuhan, 430072, P. R. China
| | - Liang Ma
- School of Science, Wuhan Institute of Technology, Wuhan, 430072, P. R. China
| | - Ying Xie
- Department School of Physics and Technology, Wuhan University, Wuhan, 430072, P. R. China
| | - Li Zhou
- Department School of Physics and Technology, Wuhan University, Wuhan, 430072, P. R. China
| | - Zhonghua Hao
- Department School of Physics and Technology, Wuhan University, Wuhan, 430072, P. R. China
| | - Ququan Wang
- Department School of Physics and Technology, Wuhan University, Wuhan, 430072, P. R. China
- The Institute for Advanced Studies, Wuhan University, Wuhan, 430072, P. R. China
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3
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Study on Surface-Enhanced Raman Scattering Substrate Based on Titanium Oxide Nanorods Coated with Gold Nanoparticles. JOURNAL OF NANOTECHNOLOGY 2018. [DOI: 10.1155/2018/9602480] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
A 3D surface-enhanced Raman scattering (SERS) substrate based on titanium oxide nanorods (TiOx-NRs) coated with gold nanoparticles (Au-NPs) was fabricated by a simple hydrothermal, no-template process. The nanostructure of TiOx-NRs influenced by the concentrations of hydrochloric (HCl) acid and sodium chloride (NaCl) was studied in detail. The substrate showed the strongest Raman enhancement, when the diameters of Au-NPs were around 40 nm and the gaps of Au-NPs were in the range of 5 nm to 10 nm. The surface electric field of our substrate was examined by finite-different time-domain (FDTD) solutions. Rhodamine 6G (R6G) was chosen as the probe molecule to study the SERS performance of the substrates. The Raman signal of 10−10 M R6G was detected clearly by the substrate with the enhancement factor of 2.64 × 108. All relative standard deviation (RSD) values of the major peaks for R6G were within the scope of 10.4% to 16.7%. The substrate could work efficiently even after immersed in water for one month.
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4
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Danesi S, Gandolfi M, Carletti L, Bontempi N, De Angelis C, Banfi F, Alessandri I. Photo-induced heat generation in non-plasmonic nanoantennas. Phys Chem Chem Phys 2018; 20:15307-15315. [DOI: 10.1039/c8cp01919c] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
The photo-induced heat generation in SiO2/Si core/shell nanoantennas is analysed on the basis of their optothermal properties.
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Affiliation(s)
- Stefano Danesi
- INSTM-UdR Brescia
- 2513 Brescia
- Italy
- Department of Mechanical and Industrial Engineering
- 2513 Brescia
| | - Marco Gandolfi
- Interdisciplinary Laboratories for Advanced Materials Physics (I-LAMP)
- 25121 Brescia
- Italy
- Dipartimento di Matematica e Fisica
- Università Cattolica del Sacro Cuore
| | - Luca Carletti
- Department of Information Engineering
- University of Brescia
- 2513 Brescia
- Italy
| | | | | | - Francesco Banfi
- Interdisciplinary Laboratories for Advanced Materials Physics (I-LAMP)
- 25121 Brescia
- Italy
- Dipartimento di Matematica e Fisica
- Università Cattolica del Sacro Cuore
| | - Ivano Alessandri
- INSTM-UdR Brescia
- 2513 Brescia
- Italy
- Department of Information Engineering
- University of Brescia
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5
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Lee S, Lee J, Nam K, Shin WG, Sohn Y. Application of Ni-Oxide@TiO₂ Core-Shell Structures to Photocatalytic Mixed Dye Degradation, CO Oxidation, and Supercapacitors. MATERIALS 2016; 9:ma9121024. [PMID: 28774145 PMCID: PMC5456972 DOI: 10.3390/ma9121024] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/14/2016] [Revised: 11/20/2016] [Accepted: 12/16/2016] [Indexed: 01/13/2023]
Abstract
Performing diverse application tests on synthesized metal oxides is critical for identifying suitable application areas based on the material performances. In the present study, Ni-oxide@TiO2 core-shell materials were synthesized and applied to photocatalytic mixed dye (methyl orange + rhodamine + methylene blue) degradation under ultraviolet (UV) and visible lights, CO oxidation, and supercapacitors. Their physicochemical properties were examined by field-emission scanning electron microscopy, X-ray diffraction analysis, Fourier-transform infrared spectroscopy, and UV-visible absorption spectroscopy. It was shown that their performances were highly dependent on the morphology, thermal treatment procedure, and TiO2 overlayer coating.
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Affiliation(s)
- Seungwon Lee
- Department of Chemistry, Yeugnam University, Gyeongsan 38541, Korea.
| | - Jisuk Lee
- Department of Chemistry, Yeugnam University, Gyeongsan 38541, Korea.
| | - Kyusuk Nam
- Department of Chemistry, Yeugnam University, Gyeongsan 38541, Korea.
| | - Weon Gyu Shin
- Department of Mechanical Engineering, Chungnam National University, Daejeon 34134, Korea.
| | - Youngku Sohn
- Department of Chemistry, Yeugnam University, Gyeongsan 38541, Korea.
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6
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Affiliation(s)
- Ivano Alessandri
- INSTM
and Chemistry for Technologies Laboratory, University of Brescia, Brescia 25123, Italy
| | - John R. Lombardi
- Department
of Chemistry, The City College of New York, New York 10031, United States
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7
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"RaMassays": Synergistic Enhancement of Plasmon-Free Raman Scattering and Mass Spectrometry for Multimodal Analysis of Small Molecules. Sci Rep 2016; 6:34521. [PMID: 27698368 PMCID: PMC5048303 DOI: 10.1038/srep34521] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2016] [Accepted: 09/15/2016] [Indexed: 11/08/2022] Open
Abstract
SiO2/TiO2 core/shell (T-rex) beads were exploited as "all-in-one" building-block materials to create analytical assays that combine plasmon-free surface enhanced Raman scattering (SERS) and surface assisted laser desorption/ionization (SALDI) mass spectrometry (RaMassays). Such a multi-modal approach relies on the unique optical properties of T-rex beads, which are able to harvest and manage light in both UV and Vis range, making ionization and Raman scattering more efficient. RaMassays were successfully applied to the detection of small (molecular weight, M.W. <400 Da) molecules with a key relevance in biochemistry and pharmaceutical analysis. Caffeine and cocaine were utilized as molecular probes to test the combined SERS/SALDI response of RaMassays, showing excellent sensitivity and reproducibility. The differentiation between amphetamine/ephedrine and theophylline/theobromine couples demonstrated the synergistic reciprocal reinforcement of SERS and SALDI. Finally, the conversion of L-tyrosine in L-DOPA was utilized to probe RaMassays as analytical tools for characterizing reaction intermediates without introducing any spurious effects. RaMassays exhibit important advantages over plasmonic nanoparticles in terms of reproducibility, absence of interference and potential integration in multiplexed devices.
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8
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Qiu B, Xing M, Yi Q, Zhang J. Chiral Carbonaceous Nanotubes Modified with Titania Nanocrystals: Plasmon-Free and Recyclable SERS Sensitivity. Angew Chem Int Ed Engl 2015; 54:10643-7. [DOI: 10.1002/anie.201505319] [Citation(s) in RCA: 64] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2015] [Indexed: 11/06/2022]
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9
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Qiu B, Xing M, Yi Q, Zhang J. Chiral Carbonaceous Nanotubes Modified with Titania Nanocrystals: Plasmon-Free and Recyclable SERS Sensitivity. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201505319] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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10
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Pradhan M, Sinha AK, Pal T. Mn Oxide-Silver Composite Nanowires for Improved Thermal Stability, SERS and Electrical Conductivity. Chemistry 2014; 20:9111-9. [DOI: 10.1002/chem.201304518] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2013] [Revised: 04/22/2014] [Indexed: 11/08/2022]
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11
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Affiliation(s)
- Lixia Sang
- Key
Laboratory of Enhanced Heat Transfer and Energy Conservation, Ministry
of Education and Key Laboratory of Heat Transfer and Energy Conversion,
Beijing Municipality, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China
| | - Yixin Zhao
- School
of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Clemens Burda
- Center
for Chemical Dynamics and Nanomaterials Research, Department of Chemistry, Case Western Reserve University, 10900 Euclid Avenue, Cleveland, Ohio 44106, United States
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12
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Salmistraro M, Schwartzberg A, Bao W, Depero LE, Weber-Bargioni A, Cabrini S, Alessandri I. Triggering and monitoring plasmon-enhanced reactions by optical nanoantennas coupled to photocatalytic beads. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2013; 9:3301-3307. [PMID: 23606587 DOI: 10.1002/smll.201300211] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/21/2013] [Indexed: 06/02/2023]
Abstract
Plasmonic metal/semiconductor nanocomposites promise to be a breakthrough for boosting and investigating photon-assisted processes at the nanoscale, with exciting perspectives for energy conversion and catalysis. However, the efficiency and selectivity of these surface processes are still far from being controlled. Here, shown for the first time, is a new class of photocatalyst which is based on the synergistic combination of bowtie-like gold nanoantennas and SiO2 /TiO2 core/shell oxide beads. These systems are exploited as efficient near-field optical light concentrators, stimulating photon-driven processes at the metal-semiconductor interface. Extraordinary enhancements of photodegradation rates (minutes instead of hours) result from matching the nanoantenna surface plasmon resonance with the optical absorption of organic dyes and the excitation source wavelength. Moreover, strong Raman enhancements are observed allowing for direct in-situ monitoring of reaction progress of different analytes on the same site.
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Affiliation(s)
- Marco Salmistraro
- INSTM and Chemistry for Technologies Lab., University of Brescia, via Branze 38, 25123 Brescia, Italy
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13
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Asanuma H, Jiang Z, Ikeda K, Uosaki K, Yu HZ. Selective dehybridization of DNA-Au nanoconjugates using laser irradiation. Phys Chem Chem Phys 2013; 15:15995-6000. [PMID: 23959057 DOI: 10.1039/c3cp52771a] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Plasmonic heating to trigger release of oligonucleotides from nanoconjugates is potentially useful for therapeutic purposes and designed assembly of DNA nanostructures. In the past, great controllability has been achieved by introducing distinctive absorption nanoparticle centers, where the anchoring bond (e.g., sulfur-gold bond) has been selectively broken. Instead of releasing the surface-bound duplex DNA via breakage of the gold-sulphur anchor bond, selective and non-destructive dehybridization of DNA under a "mild" condition on different gold nanoconjugates is demonstrated in this work. This finding will permit sequential dehybridization/release of DNA at specific regions of a complex system; thus it can be extended to control gene expression and to manipulate an assembly of highly organized DNA constructs. Particularly we show herein the feasibility of selectively dehybridizing DNA-Au nanoconjugates via localized plasmonic heating, which is accomplished by controlling the laser wavelength, power, and irradiation time.
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Affiliation(s)
- Hidehiko Asanuma
- Department of Chemistry and 4D Labs, Simon Fraser University, Burnaby, British Columbia V5A 1S6, Canada.
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14
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Skorb EV, Andreeva DV. Layer-by-Layer approaches for formation of smart self-healing materials. Polym Chem 2013. [DOI: 10.1039/c3py00088e] [Citation(s) in RCA: 92] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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15
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Qiu J, Wu YC, Wang YC, Engelhard MH, McElwee-White L, Wei WD. Surface Plasmon Mediated Chemical Solution Deposition of Gold Nanoparticles on a Nanostructured Silver Surface at Room Temperature. J Am Chem Soc 2012; 135:38-41. [DOI: 10.1021/ja309392x] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Jingjing Qiu
- Department of Chemistry and
Center for Nanostructured Electronic Materials, University of Florida, Gainesville, Florida 32611, United States
| | - Yung-Chien Wu
- Department of Chemistry and
Center for Nanostructured Electronic Materials, University of Florida, Gainesville, Florida 32611, United States
| | - Yi-Chung Wang
- Department of Chemistry and
Center for Nanostructured Electronic Materials, University of Florida, Gainesville, Florida 32611, United States
| | - Mark H. Engelhard
- Environmental Molecular Sciences
Laboratory, Pacific Northwest National Laboratory, Richland, Washington 99354, United States
| | - Lisa McElwee-White
- Department of Chemistry and
Center for Nanostructured Electronic Materials, University of Florida, Gainesville, Florida 32611, United States
| | - Wei David Wei
- Department of Chemistry and
Center for Nanostructured Electronic Materials, University of Florida, Gainesville, Florida 32611, United States
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16
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Spectroscopic investigations on the binding of Methylene Blue and Nile Blue to negatively charged gold nanorods. J Mol Struct 2012. [DOI: 10.1016/j.molstruc.2012.04.012] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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17
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Li X, Hu H, Li D, Shen Z, Xiong Q, Li S, Fan HJ. Ordered array of gold semishells on TiO2 spheres: an ultrasensitive and recyclable SERS substrate. ACS APPLIED MATERIALS & INTERFACES 2012; 4:2180-5. [PMID: 22471731 DOI: 10.1021/am300189n] [Citation(s) in RCA: 62] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Ordered array of Au semishells on TiO(2) spheres with controlled size are prepared by combining the nanosphere self-assembly and atomic layer deposition (ALD). This ordered 2-D structure with designed array of metal nanogaps can be used as an ultrasensitive surface-enhanced Raman scattering (SERS) substrate with high reproducibility and stability. More importantly, the SERS substrates are recyclable, as enabled by their self-cleaning function due to the TiO(2) photocatalytic degradation of the target molecules. The high SERS sensitivity and recyclability are demonstrated by the detection of Rhodamine 6G (R6G) and brilliant cresyl blue (BCB) molecules. As both the nanosphere lithography and ALD are scalable processes, such 2-D ordered substrates may find applications in chemical sensing.
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Affiliation(s)
- Xianglin Li
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 637371, Singapore
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18
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Diagnostic applications of Raman spectroscopy. NANOMEDICINE-NANOTECHNOLOGY BIOLOGY AND MEDICINE 2011; 8:545-58. [PMID: 22024196 DOI: 10.1016/j.nano.2011.09.013] [Citation(s) in RCA: 110] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Received: 03/31/2011] [Revised: 08/06/2011] [Accepted: 09/24/2011] [Indexed: 11/23/2022]
Abstract
UNLABELLED Raman spectroscopy has been widely used in various fields of science. It has been successfully utilized to qualitatively and quantitatively determine the molecular compositions of solid, liquid, and gaseous samples. This review focuses on the diagnostic applications of Raman spectroscopy in the past 5 years, with specific emphasis on transplant allograft rejection and cancer detections. First we introduce the principle of Raman spectroscopy and associated surface enhancement techniques. Various recent biomedical and clinical applications of Raman spectroscopy are then reviewed in detail. Finally, we present the experimental and analytical techniques required to implement Raman spectroscopy in a laboratory. FROM THE CLINICAL EDITOR This review focuses on evolving diagnostic applications of Raman spectroscopy with special emphasis on transplant allograft rejection and cancer detection.
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Sinha G, Depero LE, Alessandri I. Recyclable SERS substrates based on Au-coated ZnO nanorods. ACS APPLIED MATERIALS & INTERFACES 2011; 3:2557-63. [PMID: 21634790 DOI: 10.1021/am200396n] [Citation(s) in RCA: 127] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
Vertically aligned Au-coated ZnO nanorods (Au-ZnO NRs) were investigated as cheap, efficient and recyclable SERS-active substrates. The ZnO NRs were prepared through a simple, low-temperature hydrothermal route and made SERS-active through deposition of gold nanoislands by sputtering at room temperature. Optimized samples were able to detect methylene blue over a wide range of low concentrations (from 1 × 10(-4) to 1 × 10(-12) M), with good reproducibility. The photocatalytic properties of Au-ZnO NRs were exploited to recycle these substrates through UV-assisted cleaning. The experimental results showed that these substrates are characterized by high reproducibility and long shelf life, which make them promising as SERS platforms for multiple detection of different molecular species.
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Affiliation(s)
- Godhuli Sinha
- INSTM and Chemistry for Technologies Laboratory, University of Brescia, via Branze 38, 25123 Brescia, Italy
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20
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Plasmonic heating assisted deposition of bare Au nanoparticles on titania nanoshells. J Colloid Interface Sci 2010; 351:576-9. [DOI: 10.1016/j.jcis.2010.07.079] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2010] [Revised: 07/30/2010] [Accepted: 07/31/2010] [Indexed: 11/20/2022]
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21
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Pal S, Depero LE, Alessandri I. Using aggregates of gold nanorods in SER(R)S experiments: an empirical evaluation of some critical aspects. NANOTECHNOLOGY 2010; 21:425701. [PMID: 20858928 DOI: 10.1088/0957-4484/21/42/425701] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
An empirical evaluation of some critical aspects resulting from aggregation of gold nanorods (AuNRs) used as surface enhanced resonant Raman scattering (SERRS)-active substrates was reported. Two types of AuNR substrates with longitudinal plasmon bands which either match (in-plasmon resonance) or not (off-plasmon resonance) the wavelength of the exciting laser source (λ: 632.8 nm) were tested in resonant Raman detection of methylene blue (MB). The in-plasmon resonance condition proved to be significantly useful for detecting MB at very low concentration (less than 10(-10) M), whereas the off-plasmon resonance setup is more than enough for intermediate-low concentrations (down to 10(-8) M). Differently sized AuNR aggregates, obtained by sequential dilution of the AuNR solutions allowed us to investigate the dependence of for surface enhanced Raman scattering (SERS) intensity on the size of the aggregates, pointing out a simple strategy for preparing AuNR-based SERS substrates.
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Affiliation(s)
- Sudipto Pal
- INSTM and Chemistry for Technologies Laboratory, University of Brescia, Brescia, Italy
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22
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Alessandri I. Writing, self-healing, and self-erasing on conductive pressure-sensitive adhesives. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2010; 6:1679-1685. [PMID: 20603883 DOI: 10.1002/smll.201000638] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
A simple strategy for enabling conductive pressure sensitive adhesives (PSAs) to work as light-responsive materials is reported. Direct laser-writing of PSA substrates was achieved by means of a continuous-wave He-Ne laser focused through the objectives of an optical microscope. This approach takes advantage of cooperative interplay between viscoelastic properties of PSAs and enhanced thermal conductivity provided by an extra overlayer of gold. In particular, the thickness of the gold layer is a crucial parameter for tuning the substrate responsiveness. Self-healing and self-degradation processes can be exploited for controlling the lifetime of the written information, whereas additional protective coatings can be introduced to achieve permanent storage.
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Affiliation(s)
- Ivano Alessandri
- INSTM and Chemistry for Technologies Laboratory, University of Brescia, via Branze 38, 25123 Brescia, Italy.
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23
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Yan Z, Bao R, Chrisey DB. Excimer laser ablation of a Pt target in water: the observation of hollow particles. NANOTECHNOLOGY 2010; 21:145609. [PMID: 20234076 DOI: 10.1088/0957-4484/21/14/145609] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Micro/nanoparticles were fabricated by pulsed-excimer-laser ablation of a Pt target in water. Three kinds of hollow Pt particles (coalesced by micrograins, assembled by nanocrystals or with smooth shells) were observed together with solid particles using different laser fluences (2.3-6.8 J cm(-2)) and after 6000 laser shots. We propose that the hollow particles were formed on laser-produced bubbles which provided thermodynamically preferred nucleation sites and diffusion sinks for the laser-fabricated Pt clusters or particles. Although the hollow particles are a small proportion, the results have extended the scope of particles that pulsed-laser ablation in liquid can fabricate, and have enriched the mechanistic scenario of laser ablation and nanostructure formation in liquid.
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Affiliation(s)
- Zijie Yan
- Department of Materials Science and Engineering, Rensselaer Polytechnic Institute, Troy, NY 12180, USA
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24
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Alessandri I, Depero LE. Metal oxide microrings with femtoliter capacity for Raman microspectroscopy. ACS APPLIED MATERIALS & INTERFACES 2010; 2:594-602. [PMID: 20356210 DOI: 10.1021/am900904k] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
A simple strategy, based on ultrafast heating of polystyrene microspheres infiltrated with a zinc acetate solution, is employed here for preparing ZnO microcontainers with femtoliter capacity. Their potential exploitation in micro-Raman assays for basic studies in bio- and nanotechnology is tested in different proof-of-concept experiments concerning the in situ analysis of l-glutathione crystals and gold-yeast cytochrome c bioconjugates. The ZnO microcontainers are also used as scaffolds for atomic layer deposition of TiO(2) overlayers with a fine-tuning of thickness and morphology. The resulting ZnO/TiO(2) heterostructures are tested in different photocatalytic experiments involving degradation and laser-induced conversion of methylene blue.
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25
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Alessandri I, Depero LE. Using plasmonic heating of gold nanoparticles to generate local SER(R)S-active TiO2 spots. Chem Commun (Camb) 2009:2359-61. [PMID: 19377685 DOI: 10.1039/b900647h] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The plasmonic heating generated by laser irradiation of gold nanoparticles was exploited for fabricating SER(R)S-active anatase spots.
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Affiliation(s)
- Ivano Alessandri
- INSTM and Chemistry for Technologies Laboratory, University of Brescia, via Branze 38, 25123 Brescia, Italy.
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26
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Alessandri I, Ferroni M. Exploiting optothermal conversion for nanofabrication: site-selective generation of Au/TiO2 inverse opals. ACTA ACUST UNITED AC 2009. [DOI: 10.1039/b913478f] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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