Langmuir−Blodgett Mixed Films of Titanyl(IV) Pthalocyanine and Arachidic Acid. Molecular Orientation and Film Structure

Caño, Teodosio del; Aroca, Ricardo F.; Saja, J.A. de; Rodrı́guez-Méndez, M.L.

doi:10.1021/la020825h

Cited by 24 publications

(6 citation statements)

References 38 publications

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“…Besides the XRD, TiOPc crystalline phases have been characterized by UV−visible spectroscopy, , showing features that can be precisely and unambiguously associated with the different crystalline phases. A few papers report Raman scattering studies, , where evidence of the phase dependence of peak position and intensity are discussed. In our previous paper, we correlated the UV−visible spectra to the micro-Raman analysis, identifying, for both the spectroscopic techniques, well-defined fingerprints of amorphous and crystalline phases.…”

Section: Introductionmentioning

confidence: 99%

Controlled Polymorphism in Titanyl Phthalocyanine on Mica by Hyperthermal Beams: A Micro-Raman Analysis

et al. 2010

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The polymorphism of titanyl phthalocyanine films, grown on atomically flat mica substrates, has been systematically studied by micro-Raman spectroscopy, correlating structure and optical properties. Different growth regimes, using hyperthermal seeded supersonic beams, have been explored as a function of the substrate temperature. Specific signatures in micro-Raman spectra, correlated to different phases, are identified and discussed. We demonstrate the unprecedented ability to grow crystalline films at low temperature, with improved structural order, and we show that different regimes lead to grain dimensions in a range from the nanometric to the micrometric scale. The local micro-Raman analysis, carried out on crystallites with regular shapes, allows discriminating different structural phases of the single crystalline grains. We provide evidence that different growth regimes are achieved and controlled, paving the way to phase selection, which is envisaged as a key feature to improve device performance.

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Section: Introductionmentioning

confidence: 99%

Controlled Polymorphism in Titanyl Phthalocyanine on Mica by Hyperthermal Beams: A Micro-Raman Analysis

et al. 2010

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“…Surface-enhanced Raman scattering (SERS) − is an extremely powerful microanalytical technique that is currently receiving a great deal of attention in the literature due to its potential for application toward a wide range of problems. In particular, it is finding extensive use in the fields of biomedicine, thin-film characterization, and trace analysis. , Its low-cost, high spatial resolution, ultrasensitivity, and high structural information content make it an especially attractive option, and recent reports of single-molecule sensitivity − have led to a surge in the number of practitioners. Likewise, we are also currently witnessing a rapid and ongoing expansion of nanoscience, driven by potential applications in fundamental research and nanotechnology. − There is a clear push to develop novel techniques that allow for control over the size, shape, structure, and morphology of nanostructures produced as well as to uncover the mechanisms responsible for their varied forms. , Control over these factors, as a start, will mean a more effective and fruitful exploitation of the unique optical and electronic properties of these materials.…”

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confidence: 99%

Silver Nanowire Layer-by-Layer Films as Substrates for Surface-Enhanced Raman Scattering

et al. 2004

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In this paper, the fabrication of highly stable, surface-enhanced Raman scattering (SERS) active dendrimer/silver nanowire layer-by-layer (LBL) films is reported. Ag nanowires, approximately 100 nm in diameter, were produced in solution and transferred, using the LBL technique, onto a single fifth-generation DAB-Am dendrimer layer on a glass substrate. The Ag nanowires, and the resulting LBL films were characterized using UV-visible surface plasmon absorbance, while the LBL films were further characterized by atomic force microscopy measurements and surface-enhanced Raman and resonance Raman scattering of several analytes. The dendrimer was found to effectively immobilize the Ag nanowires with increased control over spacing and aggregation of the particles. These films are shown to be excellent substrates for SERS/SERRS measurements, demonstrating significant enhancement, and trace detection capability. Several trial analytes were tested using a variety of excitation energies, and results confirmed effective enhancement of Raman signals throughout the visible range (442-785 nm) with different molecules. Analytes were deposited onto the enhancing Ag nanowire LBL films surface using both casting and Langmuir-Blodgett monolayer transferring techniques.

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“…Surface-enhanced Raman spectroscopy (SERS) is a powerful micro-analytical technique used in various fields such as biomedicine [181], thin-film characterization [182], and trace-residue analysis [183]. For the fabrication of nanostructure layer-by-layer films, metal nanoparticles are used as functionally active building blocks.…”

Section: Applications Of Layer-by-layer Self-assemblymentioning

confidence: 99%

Emerging Strategies and Applications of Layer-by-Layer Self-Assembly

Rawtani

Agrawal

2014

Nanobiomedicine

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Layer-by-layer self-assembly is an approach to develop an ultrathin film on solid support by alternate exposure to positive and negative species with spontaneous deposition of the oppositely charged ions. This paper summarizes various approaches used for fabrication of layer-by-layer self-assembly as well as their utility to produce various devices. The layer-by-layer technique is basically used for formation of multilayer films. A variety of nanomaterials use it for the modification of films to enhance their resultant durability as well as strength. Studies have shown that many different types of materials can be used for fabrication of multilayers. Recently the layer-by-layer self-assembly technique has also been used for fabrication of gas sensors, hydrogen sensors and solar-based cells. Various methods, such as spin deposition, calcinations, and dry-transfer printing are being used for fabrication of thin films. In this review, the author summarizes the various interesting properties as well as fabrication strategies of layer-by-layer self-assembly.

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Langmuir−Blodgett Mixed Films of Titanyl(IV) Pthalocyanine and Arachidic Acid. Molecular Orientation and Film Structure

Cited by 24 publications

References 38 publications

Controlled Polymorphism in Titanyl Phthalocyanine on Mica by Hyperthermal Beams: A Micro-Raman Analysis

Controlled Polymorphism in Titanyl Phthalocyanine on Mica by Hyperthermal Beams: A Micro-Raman Analysis

Silver Nanowire Layer-by-Layer Films as Substrates for Surface-Enhanced Raman Scattering

Emerging Strategies and Applications of Layer-by-Layer Self-Assembly

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