α,ω-Aliphatic Diamines as Molecular Linkers for Engineering Ag Nanoparticle Clusters: Tuning of the Interparticle Distance and Sensing Application

Guerrini, Luca; Izquierdo-Lorenzo, Irene; Rodríguez-Oliveros, Rogelio; Sánchez‐Gil, José A.; Sánchez-Cortés, Santiago; Garcia-Ramos, J.V.; Domingo, Concepción

doi:10.1007/s11468-010-9143-x

Cited by 21 publications

(19 citation statements)

References 58 publications

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“…Moreover, molecules that are unable to interact with the plasmonic surface are hardly detected. For example, multiple authors have reported that without functionalization, they could not record a SERS spectrum of OCP molecules [ 21 , 22 , 24 ]. As an exception, the direct detection of 2,4-D, an organochlorine herbicide, could be achieved in colloidal samples of gold nanorods and nanocubes [ 40 ].…”

Section: Increasing the Electromagnetic Sers Enhancementmentioning

confidence: 99%

“…While maintaining their sensitivity, the selectivity of the SERS substrates may be further tuned by functionalizing them with linkers such as diamine [ 21 , 22 ] dithiols [ 23 ], bipyridinium dications [ 24 ], carbon, and metal-organic-frameworks [ 25 ], to name a few. The interaction of these “receptor” molecules with OCPs via covalent, electrostatic, or hydrophobic bonds will be discussed.…”

Section: Introductionmentioning

confidence: 99%

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Strategies for SERS Detection of Organochlorine Pesticides

et al. 2021

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Organochlorine pesticides (OCPs) embody highly lipophilic hazardous chemicals that are being phased out globally. Due to their persistent nature, they are still contaminating the environment, being classified as persistent organic pollutants (POPs). They bioaccumulate through bioconcentration and biomagnification, leading to elevated concentrations at higher trophic levels. Studies show that human long-term exposure to OCPs is correlated with a large panel of common chronic diseases. Due to toxicity concerns, most OCPs are listed as persistent organic pollutants (POPs). Conventionally, separation techniques such as gas chromatography are used to analyze OCPs (e.g., gas chromatography coupled with mass spectrometry (GC/MS)) or electron capture detection (GC/ECD). These are accurate, but expensive and time-consuming methods, which can only be performed in centralized lab environments after extensive pretreatment of the collected samples. Thus, researchers are continuously fueling the need to pursue new faster and less expensive alternatives for their detection and quantification that can be used in the field, possibly in miniaturized lab-on-a-chip systems. In this context, surface enhanced Raman spectroscopy (SERS) represents an exceptional analytical tool for the trace detection of pollutants, offering molecular fingerprint-type data and high sensitivity. For maximum signal amplification, two conditions are imposed: an efficient substrate and a high affinity toward the analyte. Unfortunately, due to the highly hydrophobic nature of these pollutants (OCPs,) they usually have a low affinity toward SERS substrates, increasing the challenge in their SERS detection. In order to overcome this limitation and take advantage of on-site Raman analysis of pollutants, researchers are devising ingenious strategies that are synthetically discussed in this review paper. Aiming to maximize the weak Raman signal of organochlorine pesticides, current practices of increasing the substrate’s performance, along with efforts in improving the selectivity by SERS substrate functionalization meant to adsorb the OCPs in close proximity (via covalent, electrostatic or hydrophobic bonds), are both discussed. Moreover, the prospects of multiplex analysis are also approached. Finally, other perspectives for capturing such hydrophobic molecules (MIPs—molecularly imprinted polymers, immunoassays) and SERS coupled techniques (microfluidics—SERS, electrochemistry—SERS) to overcome some of the restraints are presented.

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Section: Increasing the Electromagnetic Sers Enhancementmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Strategies for SERS Detection of Organochlorine Pesticides

et al. 2021

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“…Alivisatos and co-workers and Mirkin and co-workers have demonstrated the assembly of AuNPs into dimers, trimers and larger clusters based on a DNAprogrammed procedure. 63,64 Chemical linkers such as rigid, multivalent thiol-linkers, 65 phenylacetylene, 66,67 thiol-terminated hydrophobic ligands 68 and diamines 69,70 have been demonstrated for the fabrication of dimers with a relatively high yield. To be used for efficient SERS, Xia and co-workers proposed a simple and one-step method that generates dimers without any additional assembly steps by introducing a small amount of sodium chloride into the reaction medium.…”

Section: 62mentioning

confidence: 99%

Rational design and synthesis of SERS labels

Wang

Schlücker

2013

Analyst

138

147

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SERS labels are a new class of nanotags for optical detection based on Raman scattering. Central advantages include their spectral multiplexing capacity due to the small line width of vibrational Raman bands, quantification based on spectral intensities, high photostability, minimization of autofluorescence from biological specimens via red to near-infrared (NIR) excitation, and the need for only a single laser excitation line. Current concepts for the rational design and synthesis of SERS labels are summarized in this review. Chemical constituents of SERS labels are the plasmonically active metal colloids for signal enhancement upon resonant laser excitation, organic Raman reporter molecules for adsorption onto the metal surface for identification, and an optional protective shell. Different chemical approaches towards the synthesis of rationally designed SERS labels are highlighted, including also their subsequent bioconjugation.

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“…Memoria de la Tesis Doctoral Además, sobre dichas superficies metálicas se intensifica mucho más la señal Raman que la fluorescencia, permitiendo así la observación de las bandas Raman con menor interferencia de la emisión fluorescente. Esta técnica ha sido empleada con anterioridad por otros miembros de nuestro grupo de investigación en el análisis espectroscópico de otros pigmentos de difícil estudio [15][16][17][18][19][20][21]. El empleo del SERS en muestras reales, requiere un estudio previo de los compuestos puros, usando condiciones experimentales diversas, con el fin de obtener las condiciones óptimas y así poder aplicarlo a muestras reales.…”

Section: Introductionunclassified

“…Estas diaminas son moléculas bifuncionales, que eventualmente ensamblan dos NPs metálicas generando la formación de espacios interpartículas (hot spots) en donde el campo electromagnético localizado por plasmones de superficie se intensifica aún más, resultando de ello una enorme intensificación del espectro Raman (SERS)[15,16]. Así por ejemplo la 1,8octanodiamina (AD8) ha sido empleada en la detección de contaminantes clorados sin afinidad alguna por las NPs metálicas[17]. La naturaleza clorada de la 2,9-DClQA hace pensar que la AD8 pueda ser empleada para inducir un acercamiento de la quinacridona clorada a la superficie, por este motivo se ha empleado esta diamina en este trabajo para la detección de 2,9-DClQA por SERRS.La Figura 3.4.3. muestra los espectros SERRS de la 2,9-DClQA empleando AD8 como funcionalizador a distintas concentraciones de pigmento, desde 10 -9 M hasta 10 -Espectros SERRS ( exc =532 nm) de 2,9-DClQA en DMSO sobre coloide de Ag a diferentes concentraciones, empleando una concentración de AD8 constante de 10 -3 M. a) Espectro FT-Raman de 2,9-DClQA sólida.…”

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Detección y caracerización de quinacridonas de altas prestaciones mediante espectroscopias moleculares (raman y fluorescencia) intensificadas por nanopartículas metálicas

Nevado¹

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AgBH 4 Coloide de plata fabricado por reducción química con borohidruro sódico AgCT Coloide de plata fabricado por reducción química con citrato trisódico AgHX Coloide de plata fabricado por reducción química con clorohidrato de hidoxilamina APTS (3-aminopropil)trietoxisilano BAM Microscopía de Angulo de Brewster Del ingles: Brewster Angle microscopy BMICl Cloruro de butilmetilimidazolio CI Índice de colores Del ingles:Color Index CT Transferencia de Carga CX Calixareno DCEC4 25,27-dicarboetoxi-26,28-dihidroxi-p-tert-butilcalix[4]areno 2,9-DClQA 2,9-dicloroquinacridona DFT Teoría de funcionales de la densidad Del ingles: Density Functional Theory 2,9-DMQA 2,9-dimetilquinacridona DMSO Dimetilsulfóxido EM (Mecanismo) Electromagnético Del ingles: Electromagnetic (mechanism) FT-IR Espectroscopía IR por transformada de Fourier Del ingles: Fourier Transform FT-Raman Espectroscopía Raman por transformada de Fourier Del ingles: Fourier Transform HPLC Cromatografía líquida de alta resolución Del inglés: High Performance Liquid Chromatography v HPOP Pigmentos orgánicos de altas prestaciones Del inglés: High Performance Organic Pigments HPP Pigmentos de altas prestaciones Del ingles: High Performance Pigments

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α,ω-Aliphatic Diamines as Molecular Linkers for Engineering Ag Nanoparticle Clusters: Tuning of the Interparticle Distance and Sensing Application

Cited by 21 publications

References 58 publications

Strategies for SERS Detection of Organochlorine Pesticides

Strategies for SERS Detection of Organochlorine Pesticides

Rational design and synthesis of SERS labels

Detección y caracerización de quinacridonas de altas prestaciones mediante espectroscopias moleculares (raman y fluorescencia) intensificadas por nanopartículas metálicas

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