Oxidation of copper nanoparticles in water monitored in situ by localized surface plasmon resonance spectroscopy

Гонзалез-Посада, Ф.; Sellappan, Raja; Vanpoucke, Bert; Chakarov, Dinko

doi:10.1039/c3ra47473a

Cited by 12 publications

(13 citation statements)

References 39 publications

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“…While plasmonic nanosensors are almost exclusively made of gold or silver, LSPR sensing applications of other metal and/or metal oxide nanocomposites, e.g., zinc oxide [78][79][80], aluminium [81][82][83][84][85][86][87] and copper [88][89][90][91][92][93][94][95][96], have also been investigated. However, the non-noble metals are susceptible to corrosion in aqueous environments and oxidation in air, both of which significantly diminish refractive index sensitivity [4].…”

Section: Effect Of Nanoparticle Composition Size and Shape On Plasmomentioning

confidence: 99%

Strategies for enhancing the sensitivity of plasmonic nanosensors

et al. 2015

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Based on the localized surface plasmon resonance (LSPR) of metallic nanoparticles, plasmonic nanosensors have emerged as a powerful tool for biosensing applications. Many detection schemes have been developed and the field is rapidly growing to incorporate new methodologies and applications. Amidst all the ongoing research efforts, one common factor remains a key driving force: continued improvement of high-sensitivity detection. Although there are many excellent reviews available that describe the general progress of LSPR-based plasmonic biosensors, there has been limited attention to strategies for improving the sensitivity of plasmonic nanosensors. Recognizing the importance of this subject, this review highlights recent progress on different strategies used for improving the sensitivity of plasmonic nanosensors. These strategies are classified into the following three categories based on their different sensing mechanisms: (1) sensing based on target-induced local refractive index changes, (2) colorimetric sensing based on LSPR coupling, and (3) amplification of detection sensitivity based on nanoparticle growth. The basic principles and cutting-edge examples are provided for each kind of strategy, collectively forming a unifying framework to view the latest attempts to improve the sensitivity of nanoplasmonic sensors. Future trends for the fabrication of improved plasmonic nanosensors are also discussed.

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Section: Effect Of Nanoparticle Composition Size and Shape On Plasmomentioning

confidence: 99%

Strategies for enhancing the sensitivity of plasmonic nanosensors

et al. 2015

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“…For example, (i) although, titania modification by strong radiolytic reduction of Cu 2+ or photodeposition under anaerobic conditions resulted in formation of zero-valent copper, Cu 0 was subsequently oxidized under ambient conditions forming CuO/TiO 2 and Cu/Cu 2 O/Cu/TiO 2 , respectively [57][58][59] and (ii) even Cu NPs immersed in water were oxidized by dissolved oxygen [60]. The reported main solutions of this problem consider the necessity of preventing copper oxidation by maintaining Cu in anoxic environments [55,[61][62][63] or protecting its surface with chemical corrosion inhibitors [64], polymeric layers [47,55], and by oxide encapsulation [65]. The optimal Cu NPs based plasmonic photocatalysts should work without necessity of addition of surface-obscuring chemical stabilizers and would be storable indefinitely under ambient conditions [49].…”

Section: Metallic Copper-plasmonic Photocatalysismentioning

confidence: 99%

“…The reported main solutions of this problem consider the necessity of preventing copper oxidation by maintaining Cu in anoxic environments [55,[61][62][63] or protecting its surface with chemical corrosion inhibitors [64], polymeric layers [47,55], and by oxide encapsulation [65]. The optimal Cu NPs based plasmonic photocatalysts should work without necessity of addition of surface-obscuring chemical stabilizers and would be storable indefinitely under ambient conditions [49].…”

Section: Metallic Copper-plasmonic Photocatalysismentioning

confidence: 99%

On the Origin of Enhanced Photocatalytic Activity of Copper-Modified Titania in the Oxidative Reaction Systems

2017

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Modification of titania with copper is a promising way to enhance the photocatalytic performance of TiO 2 . The enhancement means the significant retardation of charge carriers' recombination ratio and the introduction of visible light activity. This review focuses on two main ways of performance enhancement by copper species-i.e., originated from plasmonic properties of zero-valent copper (plasmonic photocatalysis) and heterojunctions between semiconductors (titania and copper oxides). The photocatalytic performance of copper-modified titania is discussed for oxidative reaction systems due to their importance for prospective applications in environmental purification. The review consists of the correlation between copper species and corresponding variants of photocatalytic mechanisms including novel systems of cascade heterojunctions. The problem of stability of copper species on titania, and the methods of its improvement are also discussed as important factors for future applications. As a new trend in the preparation of copper-modified titania photocatalyst, the role of particle morphology (faceted particles, core-shell structures) is also described. Finally, in the conclusion section, perspectives, challenges and recommendations for future research on copper-modified titania are formulated.

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“…[35,36] Although the SPR peak position of all metal nanoparticles (MNPs) is affected by particle size and shape, the SPR peak position and intensity in CuNPs are reported to be particularly susceptible to oxidation at the NP surface, with the formation of Cu 2 O and CuO. [28][29][30] The UV-vis absorption spectrum of CuNPs in pure water, produced after 60 min of 1064-nm laser irradiation (at 10 Hz, see Experimental Methods), is shown as the solid grey trace in Fig. 2.…”

Section: Resultsmentioning

confidence: 99%

“…However, unlike, for example, the laser-based formation of gold [23] and platinum [24] nanoparticles, the susceptibility of CuNPs to surface oxidation both during and following their formation has made studies of CuNP chemistry more challenging. [28][29][30] Muniz-Miranda et al [31] have demonstrated that CuNPs prepared via laser ablation in acetone do not form a surface oxide layer and are quite stable in solution, whereas those produced in pure water do have a surface oxide layer but are relatively short-lived. These authors attribute the lack of stability of these particles to 'rapid aging through oxidation' and fast coagulation.…”

Section: Introductionmentioning

confidence: 99%

Laser-Based Formation of Copper Nanoparticles in Aqueous Solution: Optical Properties, Particle Size Distributions, and Formation Kinetics

et al. 2017

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We explore the formation kinetics, optical absorption spectra, and particle size distributions of copper nanoparticles (CuNPs) formed by direct laser ablation from the bulk metal via a process we refer to as Laser Ablation Synthesis in Solution (LASiS). Comparisons are made between CuNPs formed in pure water versus those formed in the presence of 1 Â 10 À4 M solutions of the N-donor ligands 4,4 0 -bipyridine (4,49Bipy) and 1H-5-(4-pyridyl)tetrazole (T-4Py). CuNPs formed in pure water and in the presence of 4,49Bipy display similar UV-visible absorption spectra and very similar particle size distributions. In comparison, CuNPs formed in the presence of T-4Py display significantly different absorption properties, with the surface plasmon resonance transition blue-shifted by ,55 nm, and a much smaller and narrower particle size distribution compared with the former samples. Based on previous literature reports, it is possible to ascribe these differences to differences in the CuNP surface oxidation states for samples prepared in the presence of T-4Py. However, an analysis of the formation kinetics of all three samples indicates near-identical behaviour.

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Oxidation of copper nanoparticles in water monitored in situ by localized surface plasmon resonance spectroscopy

Cited by 12 publications

References 39 publications

Strategies for enhancing the sensitivity of plasmonic nanosensors

Strategies for enhancing the sensitivity of plasmonic nanosensors

On the Origin of Enhanced Photocatalytic Activity of Copper-Modified Titania in the Oxidative Reaction Systems

Laser-Based Formation of Copper Nanoparticles in Aqueous Solution: Optical Properties, Particle Size Distributions, and Formation Kinetics

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