Self-assembled gold nanoparticle monolayers in sol–gel matrices: synthesis and gas sensing applications

Buso, Dario; Palmer, Lauren A.; Bello, Valentina; Mattei, Giovanni; Post, Michael L.; Mulvaney, Paul; Martucci, Alessandro

doi:10.1039/b817668j

Cited by 46 publications

(35 citation statements)

References 35 publications

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“…As the number of the immobilized GNPs increases on the coated area, the interparticle distances decrease resulting into a red shift and broadening of the LSPR peak due to plasmon coupling effects. Moreover, when the interparticle distance becomes even smaller and clusters are formed, new spectral bands appear at longer wavelengths [25,33,36,39,40]. In our experiments with the U-type fiber probes, all of these variations and trends were observed in the extinction spectra during the immobilization process, with typical results shown in Fig.…”

Section: Resultsmentioning

confidence: 67%

“…Many research groups have used MNPs in colloidal solutions and different protocols to achieve their immobilization on the optical fiber. Moreover, in order to avoid or control the formation of MNP aggregates which are detrimental to the sensing performance, various and often tedious procedures have been proposed that require the use of chemicals and/or polymers for pre-and/or post-treatment of the fiber and/ or the MNPs [13,14,16,18,[23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

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Tailored Aggregate-Free Au Nanoparticle Decorations with Sharp Plasmonic Peaks on a U-Type Optical Fiber Sensor by Nanosecond Laser Irradiation

et al. 2016

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A novel experimental methodology is presented for fabricating U-shaped optical fiber probes decorated with aggregate-free Au nanoparticles exhibiting sharp localized surface plasmon resonance (LSPR) spectra. The U-type tip is coated with gold nanoparticles (AuNPs) using a simple and time-efficient dip-coating procedure, without initially taking any care to prevent the formation of nanoparticle aggregates in the coated area. In a second step, the coating was irradiated with a few tens of laser pulses of 5-ns duration at 532 nm with intensities in the range of 2-14 MW/cm 2 , leading to the formation of aggregate-free LSPR optical fiber probes. The process was monitored and controlled in real time through the changes induced into the fiber's extinction spectra by the laser irradiation, and the coated fibers were characterized by electron microscopy. The proposed methodology resulted into the fabrication of U-type optical fiber probes coated with AuNPs exhibiting a sharp plasmon peak, which is a perquisite for their application as sensing devices.

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Section: Resultsmentioning

confidence: 67%

Section: Introductionmentioning

confidence: 99%

Tailored Aggregate-Free Au Nanoparticle Decorations with Sharp Plasmonic Peaks on a U-Type Optical Fiber Sensor by Nanosecond Laser Irradiation

et al. 2016

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“…[15,16]. Lead acetate (PbAc), acetic acid (HAc), mercaptohexanol (ME), thioacetamine (TAA), mercaptopropyl triethoxy silane (MPTS), methanol (MeOH), and ethanol (EtOH) were purchased from Sigma-Aldrich and used with no further purification.…”

Section: Methodsmentioning

confidence: 99%

“…The PbS QDs were synthesized according to a modified procedure adapted from that previously reported by Duso et al [15,16] (see Experimental). Figure 1a shows the transmission electron microscopy (TEM) image of the as-prepared PbS QDs.…”

Section: à3mentioning

confidence: 99%

Highly Non‐Linear Quantum Dot Doped Nanocomposites for Functional Three‐Dimensional Structures Generated by Two‐Photon Polymerization

et al. 2010

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In the past decade, owing to its unique advantage in generating arbitrary high resolution three-dimensional (3D) structures in both high and low refractive index materials with great simplicity, the two-photon polymerization (2PP) technique has played an important role in micro/nanofabrication of functional optoelectronic and photonic devices. [1][2][3][4][5][6][7] In particular, photonic crystals (PCs) are deemed to be the key elements in high-speed all-optical communication networks and optical computing. In these PC enabled applications, novel functionalities that include all-optical ultrafast switching, signal regeneration, and high speed demultiplexing are essential, all of which rely on a large third-order optical non-linearity of the constituting materials. [8,9] This thus requires that the 2PP method is able to produce micro/ nanostructures with a large third-order non-linear susceptibility (x 3 ). However, most polymer materials used in the 2PP process do not possess sufficient third-order non-linear susceptibility for functional photonic devices. To enhance their non-linearity, polymer materials have been modified with functional elements, such as metallic nanoparticles and chromophores. [10,11] Although 3D PC structures have been achieved with such nanocomposite materials, functional bandgaps in the telecommunications wavelength region with suppression in transmission larger than 5% have yet to be demonstrated. Furthermore, no non-linear properties in these nanocomposites have been reported. Nanocrystal quantum dots (QDs) are well known for their large third-order non-linearity attributed to the quantum confinement when the radius of the QD (R) is comparable or smaller than the exciton Bohr radius (a B ). [12] In the strong quantum confinement regime, where R < a B , the third-order non-linear susceptibility is proportional to R À3. In addition the non-linearity will be strongly enhanced in nanocomposites that posses a narrow particle size distribution. It is, therefore, obvious that QDs with large Bohr radii, such as PbS (a B ¼ 18 nm), and a narrow size distribution are promising candidates for enhancing the third-order non-linearity. Nanocomposites that incorporate QDs have been reported extensively, [13,14] but highly non-linear photosensitive nanocomposites suitable for 2PP have not yet been established.In this paper, by using a sol-gel process we developed nanocomposite thin films consisting of a photosensitive organic-inorganic hybrid polymer functionalized with PbS QDs to achieve large third-order non-linearity. The Z-scan measurements revealed that the third-order non-linearity of the uniformly dispersed PbS nanocomposite is -3.2 Â 10 À12 cm 2 W À1 after polymerization. It was also found that the non-linear nanocomposite is suitable for 2PP fabrication of 3D PCs. Scalable stop gaps at the telecommunications wavelength with at least 60% suppression in transmission have been achieved.

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“…In 2009, Buso et al used gold nanoparticle monolayers for the reversible detection of CO (100 -10000 ppm) at 300 ° C [90] .…”

Section: Gas Sensing and Catalysis Applicationsmentioning

confidence: 99%

Nanoplasmonic sensing for nanomaterials science

Larsson¹,

Syrenova

Langhammer

2012

Nanophotonics

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Nanoplasmonic sensing has over the last two decades emerged as and diversifi ed into a very promising experimental platform technology for studies of biomolecular interactions and for biomolecule detection (biosensors). Inspired by this success, in more recent years, nanoplasmonic sensing strategies have been adapted and tailored successfully for probing functional nanomaterials and catalysts in situ and in real time. An increasing number of these studies focus on using the localized surface plasmon resonance (LSPR) as an experimental tool to study a process of interest in a nanomaterial, with a materials science focus. The key assets of nanoplasmonic sensing in this area are its remote readout, non-invasive nature, single particle experiment capability, ease of use and, maybe most importantly, unmatched fl exibility in terms of compatibility with all material types (particles and thin/thick layers, conductive or insulating) are identifi ed. In a direct nanoplasmonic sensing experiment the plasmonic nanoparticles are active and simultaneously constitute the sensor and the studied nano-entity. In an indirect nanoplasmonic sensing experiment the plasmonic nanoparticles are inert and adjacent to the material of interest to probe a process occurring in/on this material. In this review we defi ne and discuss these two generic experimental strategies and summarize the growing applications of nanoplasmonic sensors as experimental tools to address materials science-related questions.

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Self-assembled gold nanoparticle monolayers in sol–gel matrices: synthesis and gas sensing applications

Cited by 46 publications

References 35 publications

Tailored Aggregate-Free Au Nanoparticle Decorations with Sharp Plasmonic Peaks on a U-Type Optical Fiber Sensor by Nanosecond Laser Irradiation

Tailored Aggregate-Free Au Nanoparticle Decorations with Sharp Plasmonic Peaks on a U-Type Optical Fiber Sensor by Nanosecond Laser Irradiation

Highly Non‐Linear Quantum Dot Doped Nanocomposites for Functional Three‐Dimensional Structures Generated by Two‐Photon Polymerization

Nanoplasmonic sensing for nanomaterials science

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