Development of an Anion Probe: Detection of Sulfate Ion by Two-Photon Fluorescence of Gold Nanoparticles

Tomita, Kichinobu; Ishioka, Toshio; Harata, Akira

doi:10.2116/analsci.28.1139

Cited by 8 publications

(3 citation statements)

References 44 publications

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“…Metal nanoparticles, because of their physical and chemical attributes, have long been used as elements for sensing various physical (pressure, [ 11 ] humidity, [ 12 ] temperature, [ 13 ] etc. ), chemical (organic vapors, [ 14 ] metal cations, [ 15 ] anions, [ 16 ] etc. ), and biological (oligonucleotides, [ 17 ] proteins, [ 18 ] cells, [ 19 ] etc.)…”

Section: Introductionmentioning

confidence: 99%

A Metal Nanoparticle Thermistor with the Beta Value of 10 000 K

Zhao

Guo

Wang

et al. 2022

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NTC thermistor, metallic oxide powders are mixed with a binder and sintered under high temperature (T ≈400-1450 °C). This step is not energy efficient and, even worse, prevents its use in fields requiring low-temperature processing, e.g., a flexible thermistor. In addition, with the increasing demand for high sensitivity, further improving the performance of ceramic thermistors faces great challenges. Composites of conductive filler in the insulating matrix have been used to improve the sensitivity of the temperature sensor, because the conducting pathways can be disconnected/connected upon swelling/shrinking. However, the temperature window is really small since it has to work near the melting point of crystalline regions. [1] Inspired by the ultrasensitive temperature/heat perception of living creatures, ion-conductive materials have recently attracted considerable attention. [2] For example, a composite of plant cells and carbon nanotubes shows a record high temperature sensitivity due to the increase of "free" conducting calcium cation concentration upon heating. [2b] Various ionic conductive materials (hydrogel, [3] ionic liquid, [2c,4] iongel, [5] etc.) combined with different output modes (resistance, [5a,6] capacitance, [7] voltage, [8] etc.) enable these devices with not only high thermal sensitivity, but also multiple functionalities (flexible, [5b,9] stretchable, [6b,7a] self-healing, [3a,10] etc.), displaying potential applications in electronic skins, prostheses, robots, etc. However, these ionic devices usually require sophisticated fabrication procedures and many of them suffer from poor stability due to the involvement of solvent. Up to now, the widely used NTC thermistor based on these ion-conductive materials with ultra-high sensitivity has been scarcely demonstrated.Metal nanoparticles, because of their physical and chemical attributes, have long been used as elements for sensing various physical (pressure, [11] humidity, [12] temperature, [13] etc.), chemical (organic vapors, [14] metal cations, [15] anions, [16] etc.), and biological (oligonucleotides, [17] proteins, [18] cells, [19] etc.) signals and/or species. Compared with other sensing applications, detecting temperature with metal nanoparticles is usually less efficient. This is due to the measured low activation energy (≈tens of meV), [20] indicating insensitive of their conductance to temperature. It is feasible to adjust the temperature coefficient and sensitivity of metal nanoparticles by various ligand treatments. [21] This method shows a limited increase of the activation energy (100-200 meV) by just tuning the interparticle distance. However, when these nanoparticles are functionalizedThe thermistor, typically made from metallic oxides, is a type of resistor whose electrical resistance is dependent on its temperature. Despite the wide usage, the limitations of ceramic thermistors become increasingly apparent as devices with improved performances are sought and as new applications emerge. Herein, a thermistor that is s...

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Section: Introductionmentioning

confidence: 99%

A Metal Nanoparticle Thermistor with the Beta Value of 10 000 K

Zhao

Guo

Wang

et al. 2022

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“…As an ion probe, special modified gold nanoparticles can be used to detect sulfate ions specifically. They can detect the different concentrations of sulfate ions through the aggregation degree of gold nanoparticles [8] and the fluorescence intensity of a complex [9]. Raman spectroscopy has also been reported for the determination of sulfate ions dissolved in pore water of sediments [10], and it realized the diurnal variability change monitoring of the SO 4 2− intensity of offshore seawater [11].…”

Section: Introductionmentioning

confidence: 99%

An Optical Fiber Sensor Based on Fluorescence Lifetime for the Determination of Sulfate Ions

Ding

Gong

et al. 2021

Sensors

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A new optical fiber sensor based on the fluorescence lifetime was prepared for specific detection of sulfate ion concentration, where 1,1′-(anthracene-9,10-diylbis(methylene))bis(3-(dodecylcarbamoyl)pyridin-1-ium) acted as the sulfate fluorescent probe. The probe was immobilized in a porous cellulose acetate membrane to form the sensitive membrane by the immersion precipitation method, and polyethylene glycol 400 acted as a porogen. The sensing principle was proven, as a sulfate ion could form a complex with the probe through a hydrogen bond, which led to structural changes and fluorescence for the probe. The signals of the fluorescence lifetime data were collected by the lock-in amplifier and converted into the phase delay to realize the detection of sulfate ions. Based on the phase-modulated fluorometry, the relationship between the phase delay of the probe and the sulfate ion concentration was described in the range from 2 to 10 mM. The specificity and response time of this optical fiber sensor were also researched.

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“…[12][13][14][28][29][30][31][32][33][34] In principle, bottom-up fabrication is achieved through the binding, interaction, self-assembly, and self-organization characteristics of molecules and materials as building blocks. [35][36][37][38][39] Precise control of the spacing between the fabricated electrodes for specific molecules is expected to allow ultrasensitive sensing. Nanogap devices provide a sufficient level of sensitivity, as few as a single molecule to a small number of molecules, with the direct transduction of moleculespecific binding events into electrical signals.…”

Section: Introductionmentioning

confidence: 99%