Multifunctional Microgel Magnetic/Optical Traps for SERS Ultradetection

Contreras‐Cáceres, Rafael; Abalde‐Cela, Sara; Guardia, Pablo; Fernández-Barbero, A.; Pérez‐Juste, Jorge; Alvarez-Puebla, Ramón A.; Liz‐Marzán, Luis M.

doi:10.1021/la200266e

Cited by 97 publications

(89 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Liz Marz á n et al reported that such optically active Au nanoparticles immobilized in responsive microgels, can be applied as molecular traps for surface-enhanced Raman scattering (SERS) [154,156] . The SERS performance of the gold particles can be signifi cantly improved by either increasing their size or by growing silver shells on Au cores as demonstrated in the case of Au@Ag@pNIPAM colloids with much higher SERS intensities than their Au@pNIPAM counterparts.…”

Section: Microgels/nanogels Network Composed Of Crosslinked Polymersmentioning

confidence: 99%

Coating matters: the influence of coating materials on the optical properties of gold nanoparticles

Chanana¹,

Liz‐Marzán²

2012

Nanophotonics

Self Cite

View full text Add to dashboard Cite

An essential element in the synthesis of nanomaterials based on gold nanoparticles comprises the control over parameters such as size, shape and composition, due to their strong infl uence on the properties of the particles. However, it is the coating material which often plays the primary role in tuning the size, morphology, and even plasmon resonance wavelength or mode multiplicity, as well as colloidal stability and functional versatility, ultimately determining the physical, chemical, optical, electronic and catalytic properties of the nanoparticles. Therefore, it is utterly important to select the adequate wet chemistry synthetic approach with the most suitable coating material for the preparation of gold nanoparticles with the desired requirements. Within this context, this review is focused on describing various types of organic and inorganic coating materials for gold nanoparticles that may notably affect their optical properties by either directly infl uencing the synthesis procedure or by changing their chemical and physical properties upon post-synthetic modifi cations, such that they exhibit novel and useful optical properties.

show abstract

Section: Microgels/nanogels Network Composed Of Crosslinked Polymersmentioning

confidence: 99%

Coating matters: the influence of coating materials on the optical properties of gold nanoparticles

Chanana¹,

Liz‐Marzán²

2012

Nanophotonics

Self Cite

View full text Add to dashboard Cite

show abstract

“…The self-standing hydrogel-based substrate also shows good prospects with advantages of fast target gathering and easy to recycle from the matrix for detection [79]. Because of the fast mass transfer between the matrix and the hydrogel network, the hydrogel substrate can act as a scaffold for target capture and concentration [80]. Le et al prepared a gold NPs-embedded alginate gel for the detection of PAHs and found that the targets were captured by the three-dimensional network and brought close to the hot spots generated by the nanoparticles embedded in the gel, leading to significant SERS enhancement [80].…”

Section: Hydrogel-based Substrate For Target Gatheringmentioning

confidence: 99%

“…Because of the fast mass transfer between the matrix and the hydrogel network, the hydrogel substrate can act as a scaffold for target capture and concentration [80]. Le et al prepared a gold NPs-embedded alginate gel for the detection of PAHs and found that the targets were captured by the three-dimensional network and brought close to the hot spots generated by the nanoparticles embedded in the gel, leading to significant SERS enhancement [80]. Using this substrate, quantitative analysis of four PAHs such as benzo(a)pyrene was realized with LODs as low as to 0.365 nmol L −1 [81].…”

Section: Hydrogel-based Substrate For Target Gatheringmentioning

confidence: 99%

Precision Target Guide Strategy for Applying SERS into Environmental Monitoring

Ouyang¹,

Li²,

Zhu³

et al. 2017

Raman Spectroscopy and Applications

View full text Add to dashboard Cite

Surface enhanced Raman spectroscopy (SERS) is a promising analytical technique that exhibits various applications in trace detection and identification. When it is applied into environmental monitoring, we should concern several key points to improve detection sensitivity and selectivity for the detection in complex matrix. In this tutorial review, we mainly focus on the strategies for improving the use of SERS into environmental application. The strategies are summarized for enhancing the ability of the substrate to selectively capture specific targets, and for achieving separation and concentration of the analytes from the matrix and the assembly structures for multiple phase detection. We have also introduced several newly developed detection systems using portable instruments and miniaturized devices that are more suitable for infield applications. In addition, we discuss the present challenges that hide it from wide real application and give the outlook for the future development in applying SERS in environmental monitoring.

show abstract

“…The adsorption of magnetic iron oxide NPs on the surface of pNIPAM microgel beads copolymerized with styrene in a core-shell fashion has been reported [28]. Even more complex structures have been realized by growing a pNIPAM corona on single Fe 2 O 3 covered with a sacrificial SiO 2 shell [29], or through the combination of magnetic and metallic NPs covered within the same pNIPAM microgel beads [30]. The later structure is illustrated in Figure 5, where a sketch describes the synthetic steps and the results are shown in the TEM images below.…”

Section: Pnipam Microgels and Nanoparticlesmentioning

confidence: 99%

Microgels and Nanoparticles: Where Micro and Nano Go Hand in Hand

Juárez

Liz‐Marzán²

2014

Zeitschrift Für Physikalische Chemie

Self Cite

View full text Add to dashboard Cite

Abstract:The integration of different types of materials in a single hybrid system allows the combination of multiple functionalities, which can even be used in conjunction with each other. This strategy has been exploited in nanoscale systems for the creation of so-called smart nanomaterials. Within this category, the combination of inorganic nanoparticles with stimuli-responsive microgels is of very high interest because of the wide variety of potential applications. We present here a short overview of this type of materials in which the nano-and micro-scales get nicely integrated, with a great potential to expand the range of technological applications. We focus mainly on the integration of metal nanoparticles, either by themselves or in combination with semiconductor and magnetic nanoparticles. Various examples of the synergic properties that can be obtained are described, as well as the possibility to extract useful information when optical tweezers are used to manipulate single particles. We expect that this review will stimulate additional research in this field.

show abstract

Multifunctional Microgel Magnetic/Optical Traps for SERS Ultradetection

Cited by 97 publications

References 43 publications

Coating matters: the influence of coating materials on the optical properties of gold nanoparticles

Coating matters: the influence of coating materials on the optical properties of gold nanoparticles

Precision Target Guide Strategy for Applying SERS into Environmental Monitoring

Microgels and Nanoparticles: Where Micro and Nano Go Hand in Hand

Contact Info

Product

Resources

About