UV-patternable nanocomposite containing CdSe and PbS quantum dots as miniaturized luminescent chemo-sensors

Rodríguez-Cantó, Pedro J.; Abargues, Rafael; Gordillo, H.; Suárez, Isaac; Chirvony, Vladimir S.; Albert, Sandra; Martínez‐Pastor, Juan P.

doi:10.1039/c4ra02812k

Cited by 18 publications

(19 citation statements)

References 48 publications

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“…As a result, in equilibrium, MET will be fixed, most probably, within the nanosheets leading to a hampering carrier recombination and the subsequent decrease in PL emission. Analyte binding between layers would affect locally InSe nanosheets crystallographic structure creating defects, and therefore, reducing mobility and recombination processes [31]. These two effects can be exploited, first, as a sensor to check the presence of analytes by the modification of the nanosheet surface and, second, as a method to passivate of surface defects (and the subsequent minority carrier lifetimes) in future developments of electronic and optoelectronic devices.…”

Section: Resultsmentioning

confidence: 99%

“…In fact, some works have already reported 2D materials such as graphene oxide [24], TMDs [25], or phosphorene [26] for biological [27,28] and chemical sensing [26,29]. Among them, it is worth noting chemical sensing using optical instead of electrical properties of 2D materials as a transduction mechanism [30][31][32].…”

Section: Introductionmentioning

confidence: 99%

“…In this work exfoliated InSe nanosheets have been demonstrated as a vapour sensor, which is validated by using 2-mercaptoethanol (MET) as an analyte, because thiols show a very strong affinity to metals [30][31][32]. After the characterization of the samples, we demonstrate chemosensing capabilities by measuring changes in the photoluminescence (PL) as a function of the exposure time to MET.…”

Section: Introductionmentioning

confidence: 99%

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Two-Dimensional Indium Selenide for Sulphur Vapour Sensing Applications

et al. 2020

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Surface-to-volume ratio in two-dimensional (2D) materials highlights among their characteristics as an inherent and intrinsic advantage taking into account their strong sensitivity to surface effects. For this reason, we have proposed in this work micromechanically exfoliated 2D nanosheets of InSe as an optical vapour sensor. As a proof of concept, we used 2-mercaptoethanol as the chemical analyte in vapour phase to monitor the change of the InSe photoluminescence (PL) before and after exposure to the analyte. For short vapour exposure times (at low analyte concentration), we found a PL enhancement of InSe nanosheets attributed to the surface localization of Se defects. For long vapour exposure times (or higher concentrations) a PL reduction is observed, probably due to the diffusion of molecules within the nanosheet. These results confirm the capability of 2D InSe as a photoluminescent sensor of vapours, because of its sensitivity to surface passivation or volume diffusion of molecules.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Two-Dimensional Indium Selenide for Sulphur Vapour Sensing Applications

et al. 2020

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“…In the early development, photolithography was applied on QD‐photoresist composites to fabricate micropatterns. Generally, this resulted in limited QD loading, due to low dispersibility of QDs in common photoresist, such as SU8, and polyisoprene‐based photoresist . Recently, several photolithography‐based techniques have been developed to directly pattern QD films.…”

Section: Micropatterning Of Qd Compositesmentioning

confidence: 99%

Composite Structures with Emissive Quantum Dots for Light Enhancement

Smith

Lin

et al. 2018

Advanced Optical Materials

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The optical properties of these nanostructures can be controlled via precise control of the synthetic parameters resulting in a wide range of chemical compositions, shapes, and dimensions. QDs are quite advantageous in comparison to traditional organic dye counterparts, offering size, and composition dependent energy band gaps (i.e., tunable absorption and photoluminescence), prospective excellent photostability, and solution and aqueous processability based on choice of surface chemistries. [2] Intense research in this field in the past two decades has focused on precisely engineering core-shell composition of QD nanostructures resulting in an appreciable impact on the field of photonic materials and structures to develop composite nanomaterials with precise control of refractive index, permittivity, and permeability.QDs are the promising candidate to control interactions in photonic systems in many respects due to their enhanced photostability, near 100% quantum yield, and versatile surface chemistry. More recently, facile synthetic techniques for large-scale high-quality production have been introduced that involve wet chemical processes to expand applicability of these components in light-managements devices. [5][6][7] However, the overall processability and scalability of these components into robust large-area structures are still a critical concern limiting real-life implementation in robust designs. While there are many techniques to produce QDs, common limitations for this class of nanomaterials are low quantity, large dispersibility in size, compositional nonuniformity, and the presence of excess passive components resulting from wet chemistry synthetic procedures (e.g., ligands).Providing a convenient host matrix not only overcomes some of these common limitations but allows for QDs to be used in more technologically exploitable forms such as robust, flexible, mechanically and chemically stable fibers, coatings, films, and patterns. [8] For such composite systems, inclusion of nanoparticles into sophisticated matrices typically results in the significant improvements of thermal, mechanical, electrical, and optical stabilities making them more applicable in device environment than other traditional organic materials.While the concept of embedding various nanostructures into different surrounding materials is not new, synthetic techniques required to combine these can be rather complex. Most Since their inception, quantum dots have proven to be advantageous for light management applications due to their high brightness and wellcontrolled absorption, scattering, and emission properties. As quantum dots become commercially available at large scale, the need for robust, stable, and flexible optical components continues to drive the development of robust and flexible quantum dot composite materials. In this review, after a thorough introduction to quantum dots, discussion delves into methods for fabricating quantum dot loaded composite optical elements such as thin films, microfabricated patterns, and micros...

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“…Alternatively, low toxic solvents (e.g., ethanol)25 have been introduced but are impractical due to the low flash point. In addition, severe QD aggregation4,13,16,26–29 during dispersion and micro‐patterning30–35 is the next notable problem, which is caused by the incompatibility between the surface ligand and binders such as polymers, reactive monomers/oligomers, and functional additives in the photopolymerizable mixtures 36–39…”

Section: Introductionmentioning

confidence: 99%

Design Principle of Reactive Components for Dimethacrylate‐Terminated Quantum Dots: Preserved Photoluminescent Quantum Yield, Excellent Pattern Uniformity, and Suppression of Aggregation in the Matrix

Lee

2020

Macro Chemistry & Physics

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With the advent of various quantum dot (QD)‐based application technologies, the demand for low‐cost, eco‐friendly, high‐performance nanocomposites (e.g., QD photoresist) is rapidly increasing. However, the aggregation phenomenon due to incompatibility between QDs and components is still a limitation in industrial use. Herein, the principle of selecting reactive components that inhibit aggregation and preserve photoluminescent properties is presented. For model QDs (bis[2‐(methacryloyloxy)ethyl] phosphate/1‐dodecanethiol [BMEP/DDT] capped QDs), BMEP allows copolymerization and coadded DDT minimizes the loss of absolute quantum yield during ligand exchange. Besides, bisphenol A ethoxylate dimethacrylate (Mn: ≈1700, polyethylene oxide) suppresses aggregation in the matrix and provide high solubility in alkaline solution. More specifically, the coated thin film (1.0 µm thick) containing up to 20.0 wt% QDs exhibits not only transmittance of more than 85% at 550 nm, but also excellent pattern uniformity at high resolution.

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UV-patternable nanocomposite containing CdSe and PbS quantum dots as miniaturized luminescent chemo-sensors

Abstract: We have developed a patternable nanocomposite sensor based on luminescent CdSe QDs and a polyisoprene-based photoresist (PIP) as host matrix that showed chemosensing response against MET and EDA in vapour with a LOD around 0.1 pg and 15 ng, respectively.

Cited by 18 publications

References 48 publications

Two-Dimensional Indium Selenide for Sulphur Vapour Sensing Applications

Two-Dimensional Indium Selenide for Sulphur Vapour Sensing Applications

Composite Structures with Emissive Quantum Dots for Light Enhancement

Design Principle of Reactive Components for Dimethacrylate‐Terminated Quantum Dots: Preserved Photoluminescent Quantum Yield, Excellent Pattern Uniformity, and Suppression of Aggregation in the Matrix

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