Thermal decomposition study of HAuCl4·3H2O and AgNO3 as precursors for plasmonic metal nanoparticles

Otto, K.; Açik, Ilona Oja; Krunks, Malle; Tõnsuaadu, Kaia; Mere, Arvo

doi:10.1007/s10973-014-3814-3

Cited by 78 publications

(67 citation statements)

References 26 publications

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“…First, the chloroauric acid (HAuCl 4 ) solution (gold (III) chloride solution in dilute HCL, Sigma Aldrich), which was used as a catalyst instead of the Au nanoparticles used in the normal synthesis process, was dropped on a Si wafer. Normally, Au is reduced from HAuCl 4 at over 300 C, 15 meaning that the catalyst of Au is formed e®ectively on the substrate as the temperature elevates to 370 C. To reduce the contamination, the heating time was optimized to 30 min with a high vacuum state. After the catalysis deposition, the chamber pressure, plasma power,°o w rates of gases (Ar and SiH 4 ) and the processing time of the PECVD were controlled and the conditions for H-SiNW synthesis were optimized, as shown in Table 1.…”

Section: Experimental Methodsmentioning

confidence: 99%

Controlled Synthesis of Horizontal Silicon Nanowires for Biosensor Application

Ahn

Mun

Kulkarni

et al. 2015

NANO

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Top-down silicon nanowire (SiNW) fabrication mechanisms for connecting electrodes are widely utilized because they provide good control of the diameter to length ratio. The representative mechanism for the synthesis of SiNWs, a top-down approach, has limitations on the control of their diameter following lithography technologies, requires a long manufacturing process and is not cost-e®ective. In this study, we have implemented the bottom-up growth of horizontal SiNWs (H-SiNWs) on Si/SiO 2 substrates directly by plasma enhanced chemical vapor deposition (PECVD) under about 400 C. The HAuCl4 solution as a catalyst and SiH 4 gas as a precursor are used for the synthesis of H-SiNWs. After optimization of synthesis conditions, we evaluated the photoelectric properties of the H-SiNWs under illumination with di®erent light intensities. Further, we demonstrated the feasibility of H-SiNW devices for the detection of biotinylated DNA nanostructures and streptavidin interaction.

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Section: Experimental Methodsmentioning

confidence: 99%

Controlled Synthesis of Horizontal Silicon Nanowires for Biosensor Application

Ahn

Mun

Kulkarni

et al. 2015

NANO

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Section: Introductionmentioning

confidence: 92%

“…The previous thermoanalytical study has shown that the thermal decomposition of HAuCl4•3H2O into pure gold and gaseous products takes place as a gradual decomposition process in the temperature range of 75-320 °C in air. Despite that, Au and AuCl were detected as the intermediate decomposition products at 240 °C [16].Au-NPs deposited in-situ by chemical spray pyrolysis method have been grown directly onto glass and ITO (indium tin oxide) covered glass substrates by ultrasonic spray pyrolysis [11,12] or deposited in combination with several metal oxide [11,12,14,15] and sulfides [10] matrixes. Moreover, it has been shown lately, that Au-NPs deposited in-situ by chemical spray pyrolysis method have enhanced the out-put characteristics of the solely sprayed thin film solar cell [17].…”

mentioning

confidence: 99%

In-situ deposition of gold nanoparticles onto different substrates by chemical spray pyrolysis

Açik

Oyekoya

Mere

et al. 2015

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. Au-nanoparticles were deposited in-situ by chemical spray pyrolysis method onto glass and indium tin oxide (ITO) covered glass substrates in the temperature range of 260 to 400 °C. SEM studies showed that the number of Au-NPs increased and the particle size decreased with increasing the deposition temperature. The surface plasmon resonance effect of Au-NPs on glass substrate shifts from 550 to 520 nm with decreasing the mean crystallite size of Au-NPs from 49 to 24 nm. The surface plasmon resonance effect of Au-NPs on ITO substrate shift from 570 to 540 nm with decreasing the mean crystallite size of Au-NPs from 53 to 16 nm. IntroductionNoble metal nanoparticles (NPs) such as gold, silver and copper have attracted researchers' interest due to their unique plasmonic properties and potential applications in optics, nanoelectronics, biomedicine, catalysis and photovoltaics [1][2][3][4]. Spectral position of plasmon resonance depends on the size and shape of nanoparticles, distance between them and permittivity of environment and metal [5]. Metal nanoparticles have been deposited by several methods such as electrodeposition [6], sputtering [7], spin-coating [8,9] and spray pyrolysis [10][11][12].Chemical spray pyrolysis (CSP) is a low-cost material deposition method; here the solution of appropriate precursor materials is deposited in the form of fine droplets onto the preheated substrate where the growth of material takes place. To obtain Au-NPs by spray pyrolysis either preformed nanoparticles are sprayed [13] or Au-NPs are generated via thermal decomposition of Au-precursor salts such as HAuCl4•nH2O, HAuCl4,14,15]. The previous thermoanalytical study has shown that the thermal decomposition of HAuCl4•3H2O into pure gold and gaseous products takes place as a gradual decomposition process in the temperature range of 75-320 °C in air. Despite that, Au and AuCl were detected as the intermediate decomposition products at 240 °C [16].Au-NPs deposited in-situ by chemical spray pyrolysis method have been grown directly onto glass and ITO (indium tin oxide) covered glass substrates by ultrasonic spray pyrolysis [11,12] or deposited in combination with several metal oxide [11,12,14,15] and sulfides [10] matrixes. Moreover, it has been shown lately, that Au-NPs deposited in-situ by chemical spray pyrolysis method have enhanced the out-put characteristics of the solely sprayed thin film solar cell [17].

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“…For example, AgNO 3 decomposes in the temperature range of 360-515 °C to Ag, NO 2 , NO, and O 2 . [43] The combustion of paper releases heat that increases the wileyonlinelibrary.com temperature of the template above that of the furnace; based on the color of the burning template inside the furnace (the color was red to orange), we estimated that the actual temperature of the burning template can reach ≈850 °C. These temperatures may be high enough, in some cases, to cause the decomposition of the salts to clusters of elemental metal (e.g., to elemental silver).…”

Section: Mechanism Of the Reduction Of Metal Ionsmentioning

confidence: 99%

Fabrication of Paper‐Templated Structures of Noble Metals

Christodouleas

Simeone

Tayi

et al. 2017

Adv Materials Technologies

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(1 of 8) 1600229wileyonlinelibrary.com metal nanoparticles may have high surface area per unit of weight of metal, but may (depending on the support) be impermeable to gases and liquids.Papers and fabrics have open fibrous structures, which provide them with higher accessible surface area than flat films of similar dimensions, and are permeable to liquids and gases. If noble metals could be fabricated in structures that are morphologically similar to paper or fabric, these structures might exhibit attractive physical properties (e.g., high surface area, mechanical flexibility, permeability to gases and liquids) and might also be plausible materials for use in electroanalysis, as catalysts, electrical conductors, or magnetic collectors.This article describes a method for fabricating free-standing materials of a number of late transition metals (i.e., noble metals); these materials have physical morphologies that resemble paper, thread, or fabric. We call the method "paper-templating," and the resulting structures "paper-templated metals." Paper-templating uses paper or fabric as a template, and solutions of metallic ions deposited on the paper or fabric as precursors to the metal. The template is first loaded with aqueous solutions of salts of noble metals and dried. The paper (or cotton fabric, in same experiments) is then burned off in a stream of air in a furnace held at temperatures between 550 and 800 °C, depending on the procedure, and the resulting structure annealed for 2 min. The method yields structures that resemble the shape and detailed morphology of the original template ( Figure 1A,B); this morphology, at scales down to 2 µm, is remarkably similar to that of the material (e.g., paper) from which they were derived ( Figure 1C-F). The structures are composed primarily (>94% w/w, and 55-80 at%) of elemental metal. Using paper-templating, we fabricated: (i) paper-templated structures of noble metals (i.e., gold, silver, platinum, rhodium, palladium, and iridium), (ii) paper-templated structures of mixtures or alloys of noble metals (i.e., gold-platinum, silverpalladium, gold-rhodium, and gold-rhodium-platinum), and (iii) paper-templated structures with different regions composed of a different noble metal (i.e., gold/silver, platinum/rhodium). These structures were electrically conductive, and permeable to gases and liquids. The surface areas of these structures were more than 20 times higher than their projected areas. The surface of paper-templated gold was electroactive, and the structure could be used as the working electrode for electroanalysis ( Figure 1G,H). Dionysios C. Christodouleas, Felice C. Simeone, Alok Tayi, Sonia Targ, James C. Weaver, Kaushik Jayaram, Maria Teresa Fernández-Abedul, and George M. Whitesides* This manuscript describes a simple and rapid method for fabricating freestanding structures composed primarily (>94% w/w, and 55-80 at%) of noble metals (e.g., gold, silver, platinum, etc.) and having physical morphologies that resemble paper, thread, or fabric. In this method, ...

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Thermal decomposition study of HAuCl4·3H2O and AgNO3 as precursors for plasmonic metal nanoparticles

Cited by 78 publications

References 26 publications

Controlled Synthesis of Horizontal Silicon Nanowires for Biosensor Application

Controlled Synthesis of Horizontal Silicon Nanowires for Biosensor Application

In-situ deposition of gold nanoparticles onto different substrates by chemical spray pyrolysis

Fabrication of Paper‐Templated Structures of Noble Metals

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