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Nanomaterials
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Gold and Silver Nanoparticles for Selective and Sensitive Sensing Applications
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Gold and Silver Nanoparticles for Selective and Sensitive Sensing Applications

A special issue of Nanomaterials (ISSN 2079-4991). This special issue belongs to the section "Nanoelectronics, Nanosensors and Devices".

Deadline for manuscript submissions: closed (15 August 2022) | Viewed by 13468

Special Issue Editor

Dr. Tai-Chia Chiu

E-Mail Website
Guest Editor
Department of Applied Science, National Taitung University, Taitung 95092, Taiwan
Interests: noble metal nanoparticles; carbon dots; nanosensors; colorimetric; fluorescence resonance energy transfer; bioanalysis

Special Issue Information

Dear Colleagues,

Gold and silver nanoparticles have become the most popular materials for sensing a wide range of target analytes, such as metal ions, anions, and molecules like saccharides, nucleotides, amino acids, proteins, toxins, etc.. They offer numerous advantages including ease in preparation and functionalization, stability, biocompatibility, and size- and shape-dependent optical and electronic properties. Owing to these excellent properties, gold and silver nanoparticles can be utilized as smart nanosensors with a series of methodologies, including colorimetric, fluorescence, surface-enhanced Raman scattering (SERS), light scattering, and electrochemical methods. Therefore, this Special Issue of Nanomaterials devoted to Gold and Silver Nanoparticles for Selective and Sensitive Sensing Applications will offer a comprehensive selection of recent research works, short communications, and review articles focused on current developments in the use of nanosensors based on gold and silver nanoparticles for selective and sensitive sensing approaches to various kinds of target analytes, as well as nanocomposites with gold and silver nanoparticles.

Dr. Tai-Chia Chiu
Guest Editor

Manuscript Submission Information

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Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2900 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • gold nanoparticles
  • silver nanoparticles
  • functionalization
  • sensing
  • colorimetric
  • fluorescence
  • electrochemical
  • surface-enhanced Raman scattering
  • light scattering

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Published Papers (5 papers)

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Research

10 pages, 2481 KiB  
Article
Graphene-Encapsulated Silver Nanoparticles for Plasmonic Vapor Sensing
by Gábor Piszter, György Molnár, András Pálinkás and Zoltán Osváth
Nanomaterials 2022, 12(14), 2473; https://doi.org/10.3390/nano12142473 - 19 Jul 2022
Cited by 2 | Viewed by 2292
Abstract
Graphene-covered silver nanoparticles were prepared directly on highly oriented pyrolytic graphite substrates and characterized by atomic force microscopy. UV–Vis reflectance spectroscopy was used to measure the shift in the local surface plasmon resonance (LSPR) upon exposure to acetone, ethanol, 2-propanol, toluene, and water [...] Read more.
Graphene-covered silver nanoparticles were prepared directly on highly oriented pyrolytic graphite substrates and characterized by atomic force microscopy. UV–Vis reflectance spectroscopy was used to measure the shift in the local surface plasmon resonance (LSPR) upon exposure to acetone, ethanol, 2-propanol, toluene, and water vapor. The optical responses were found to be substance-specific, as also demonstrated by principal component analysis. Point defects were introduced in the structure of the graphene overlayer by O2 plasma. The LSPR was affected by the plasma treatment, but it was completely recovered using subsequent annealing. It was found that the presence of defects increased the response for toluene and water while decreasing it for acetone. Full article
(This article belongs to the Special Issue Gold and Silver Nanoparticles for Selective and Sensitive Sensing Applications)
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13 pages, 3505 KiB  
Article
Fabrication of Enzyme-Free and Rapid Electrochemical Detection of Glucose Sensor Based on ZnO Rod and Ru Doped Carbon Nitride Modified Gold Transducer
by Habibulla Imran, Asrar Alam, Venkataraman Dharuman and Sooman Lim
Nanomaterials 2022, 12(10), 1778; https://doi.org/10.3390/nano12101778 - 23 May 2022
Cited by 12 | Viewed by 2681
Abstract
Over 3 in 4 adults with diabetes live in low- and middle-income counties and health expenditure also increased 316% over the last 15 years. In this regard, we fabricate low cost, reusable and rapid detection of diabetes sensor based on zinc oxide rod [...] Read more.
Over 3 in 4 adults with diabetes live in low- and middle-income counties and health expenditure also increased 316% over the last 15 years. In this regard, we fabricate low cost, reusable and rapid detection of diabetes sensor based on zinc oxide rod inserted ruthenium-doped carbon nitride (ZnO–g–Ru–C3N4) modified sensor device. Developed sensor device physically and electrochemically characterized using X-ray diffraction (XRD), fourier-transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), cyclic voltammetry (CV), chronoamperometry (CA) and differential pulse voltammetry (DPV). Sensing device as an effective enzyme-free glucose detection with high sensitivity (346 μA/mM/cm2) over the applied lower potential of +0.26 V (vs. Ag/AgCl), fast response (3 s) and broad linear range of (2–28) mM, coupled with a lower limit of detection (3.5 nM). The biosensing device gives better anti-interference ability with justifiable reproducibility, reusability (single electrode re-use 26 times in physiological buffer and 3 times in serum) and stability. Moreover, the real-time applicability of the sensor device was evaluated in human blood, serum and urine samples. Full article
(This article belongs to the Special Issue Gold and Silver Nanoparticles for Selective and Sensitive Sensing Applications)
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14 pages, 3618 KiB  
Article
Thy-AuNP-AgNP Hybrid Systems for Colorimetric Determination of Copper (II) Ions Using UV-Vis Spectroscopy and Smartphone-Based Detection
by Thitiporn Thongkam, Amara Apilux, Thitaporn Tusai, Tewarak Parnklang and Sumana Kladsomboon
Nanomaterials 2022, 12(9), 1449; https://doi.org/10.3390/nano12091449 - 24 Apr 2022
Cited by 7 | Viewed by 2768
Abstract
A colorimetric probe based on a hybrid sensing system of gold nanoparticles (AuNPs), silver nanoparticles (AgNPs), and thymine (Thy) was developed for easy and rapid detection of copper (II) ions (Cu2+) in solution. The underlying principle of this probe was the [...] Read more.
A colorimetric probe based on a hybrid sensing system of gold nanoparticles (AuNPs), silver nanoparticles (AgNPs), and thymine (Thy) was developed for easy and rapid detection of copper (II) ions (Cu2+) in solution. The underlying principle of this probe was the Cu2+-triggered aggregation of the nanoparticle components. Color change of the sensing solution (from red to purple) was clearly observed with naked eyes. The experimental parameters, including pH and concentration of tris buffer, thymine concentration and AgNP dilution ratios, were investigated and optimized. Once optimized, the limits of detection were found to be 1, 0.09 and 0.03 ppm for naked eyes, smartphone application and UV-vis spectrophotometer, respectively. Furthermore, determination of Cu2+ was accomplished within 15 min under ambient conditions. For quantitative analysis, the linearity of detection was observed through ranges of 0.09–0.5 and 0.03–0.5 ppm using smartphone application and UV-vis spectrophotometer, respectively, conforming to the World Health Organization guideline for detection of copper at concentrations < 2 ppm in water. This developed hybrid colorimetric probe exhibited preferential selectivity toward Cu2+, even when assessed in the presence of other metal ions (Al3+, Ca2+, Pb2+, Mn2+, Mg2+, Zn2+, Fe3+, Ni2+, Co2+, Hg2+ and Cd2+). The developed procedure was also successfully applied to quantification of Cu2+ in real water samples. The recovery and relative standard deviation (RSD) values from real water sample analysis were in the ranges of 70.14–103.59 and 3.21–17.63%, respectively. Our findings demonstrated a successful development and implementation of the Thy-AuNP-AgNP hybrid sensing system for rapid, simple and portable Cu2+ detection in water samples using a spectrophotometer or a smartphone-based device. Full article
(This article belongs to the Special Issue Gold and Silver Nanoparticles for Selective and Sensitive Sensing Applications)
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15 pages, 2566 KiB  
Article
Minimizing the Silver Free Ion Content in Starch Coated Silver Nanoparticle Suspensions with Exchange Cationic Resins
by Catarina S. M. Martins, Alberto N. Araújo, Luís Pleno de Gouveia and João A. V. Prior
Nanomaterials 2022, 12(4), 644; https://doi.org/10.3390/nano12040644 - 15 Feb 2022
Cited by 2 | Viewed by 1839
Abstract
This work describes the optimization of a methodology for the reduction of silver ions from silver nanoparticle suspensions obtained from low-yield laboratory procedures. The laboratory synthesis of silver nanoparticles following a bottom-up approach starting from silver nitrate, originates silver ions that were not [...] Read more.
This work describes the optimization of a methodology for the reduction of silver ions from silver nanoparticle suspensions obtained from low-yield laboratory procedures. The laboratory synthesis of silver nanoparticles following a bottom-up approach starting from silver nitrate, originates silver ions that were not reduced to their fundamental state for nanoparticles creation at the end of the process. However, it is well known that silver ions can easily influence chemical assays due to their chemical reactivity properties and can limit biological assays since they interfere with several biological processes, namely intracellular ones, leading to the death of living cells or organisms. As such, the presence of silver ions is highly undesirable when conducting biological assays to evaluate the influence of silver nanoparticles. We report the development of an easy, low-cost, and rapid methodology that is based on cation exchange resins to minimize the silver ion content in a raw suspension of silver nanoparticles while preserving the integrity of the nanomaterials. This procedure preserves the physical-chemical properties of the nanoparticles, thus allowing the purified nanoparticulate systems to be biologically tested. Different types of cationic resins were tested, and the developed methodology was optimized by changing several parameters. A reduction from 92% to 10% of free silver/total silver ratio was achieved when using the Bio-Rad 50W-X8 100–200 mesh resin and a contact time of 15 min. Filtration by vacuum was used to separate the used resin from the nanoparticles suspension, allowing it to be further reused, as well as the purified AgNPs suspension. Full article
(This article belongs to the Special Issue Gold and Silver Nanoparticles for Selective and Sensitive Sensing Applications)
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17 pages, 7167 KiB  
Article
AZO-Based ZnO Nanosheet MEMS Sensor with Different Al Concentrations for Enhanced H2S Gas Sensing
by Yempati Nagarjuna, Jun-Cong Lin, Sheng-Chang Wang, Wen-Tse Hsiao and Yu-Jen Hsiao
Nanomaterials 2021, 11(12), 3377; https://doi.org/10.3390/nano11123377 - 13 Dec 2021
Cited by 12 | Viewed by 2974
Abstract
The properties of H2S gas sensing were investigated using a ZnO nanostructure prepared with AZO (zinc oxide with aluminium) and Al surfaces which were developed on a MEMS (Micro Electromechanical System) device. Hydrothermal synthesis was implemented for the deposition of the [...] Read more.
The properties of H2S gas sensing were investigated using a ZnO nanostructure prepared with AZO (zinc oxide with aluminium) and Al surfaces which were developed on a MEMS (Micro Electromechanical System) device. Hydrothermal synthesis was implemented for the deposition of the ZnO nanostructure. To find the optimal conditions for H2S gas sensing, different ZnO growth times and different temperatures were considered and tested, and the results were analysed. At 250 °C and 90 min growth time, a ZnO sensor prepared with AZO and 40 nm Al recorded an 8.5% H2S gas-sensing response at a 200 ppb gas concentration and a 14% sensing response at a gas concentration of 1000 ppb. The dominant sensing response provided the optimal conditions for the ZnO sensor, which were 250 °C temperature and 90 min growth time. Gas sensor selectivity was tested with five different gases (CO, SO2, NO2, NH3 and H2S) and the sensor showed great selectivity towards H2S gas. Full article
(This article belongs to the Special Issue Gold and Silver Nanoparticles for Selective and Sensitive Sensing Applications)
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