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Applied Sciences
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Nano-Biophotonics in Sensing Using Nanostructures
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Nano-Biophotonics in Sensing Using Nanostructures

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Optics and Lasers".

Deadline for manuscript submissions: closed (30 November 2020) | Viewed by 6258

Special Issue Editor

Dr. Vincent K.S. Hsiao

E-Mail Website
Guest Editor
Department of Applied Materials and Optoelectronic Engineering, National Chi Nan University, Puli Township, Nantou 54561, Taiwan
Interests: photoelectrics; thermoelectrics and photothermoelectrics; photoelectrochemistry; laser-assisted fabrication of nanomaterials; laser spectroscopy; triboelectric nanogenerator (TENG)
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Light–matter interaction, especially in nanostructures, has attracted researchers’ attention due to the variable shapes of nanostructures with different optical effects. For example, nanoparticles, raging in the 10–100 nm scale, own different photoluminescence properties. In the current Special Issue, we are especially encouraging those results in the fields of nano-biophotonics in sensing using nanostructures in one (nanowires, nanorods), two (nanofilms, 2D materials, graphene) or three dimensions (nanoparticles of different shape and size). Other topics related to the fields of nano-biophotonics are also welcome.

Dr. Vincent K.S. Hsiao
Guest Editor

Manuscript Submission Information

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Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Applied Sciences is an international peer-reviewed open access semimonthly journal published by MDPI.

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Keywords

  • Nanostructure
  • Sensing
  • Biophotonics

Published Papers (2 papers)

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Research

11 pages, 4767 KiB  
Article
Zinc Oxide Nanorod Surface-Enhanced Raman Scattering Substrates without and with Gold Nanoparticles Fabricated through Pulsed-Laser-Induced Photolysis
by Chia-Man Chou, Le Tran Thanh Thi, Nguyen Thi Quynh Nhu, Su-Yu Liao, Yu-Zhi Fu, Le Vu Tuan Hung and Vincent K. S. Hsiao
Appl. Sci. 2020, 10(14), 5015; https://doi.org/10.3390/app10145015 - 21 Jul 2020
Cited by 13 | Viewed by 3490
Abstract
We fabricated surface-enhanced Raman scattering (SERS) substrates using gold nanoparticle (AuNP)-decorated zinc oxide (ZnO) nanorods (NRs). Prior to decoration with AuNPs, ZnO NRs on the glass substrate fabricated using the sol–gel method could enhance the SERS signal for detecting 10−5 M rhodamine [...] Read more.
We fabricated surface-enhanced Raman scattering (SERS) substrates using gold nanoparticle (AuNP)-decorated zinc oxide (ZnO) nanorods (NRs). Prior to decoration with AuNPs, ZnO NRs on the glass substrate fabricated using the sol–gel method could enhance the SERS signal for detecting 10−5 M rhodamine 6G (R6G). Microscopic analysis revealed that the thermal-annealing process for fabricating the seed layers of ZnO facilitated the growth of ZnO NRs with the highly preferred c-axis (002) orientation. A decrease in the diameter of ZnO NRs occurred because of the use of annealed seek layers further increased the surface-to-volume ratio of ZnO NRs, resulting in an increase in the SERS signal for R6G of 10−5 M. To combine the localized surface plasmon resonance (LSPR) mode with the charge transfer (CT) mode, ZnO NRs were decorated with AuNPs through pulsed-laser-induced photolysis (PLIP). However, the preferred vertical (002) orientation of ZnO NRs was prone to the aggregation of AuNPs, which hindered the SERS signal. The experimental results revealed that ZnO NRs with the crystalline structure of horizontal (100) and (101) orientations facilitated the growth of homogeneous, independent and isolated AuNPs which serves as “hot spots” for SERS signal of detecting R6G at a low concentration of 10−9 M. Comparing to previous fabrication of SERS substrate, our method has advantage to fabricate AuNP-decorated ZnO NR in a short time. Moreover, the optimization of the SERS behaviors for different fabrication conditions of AuNPs using the PLIP method was investigated in detail. Full article
(This article belongs to the Special Issue Nano-Biophotonics in Sensing Using Nanostructures)
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10 pages, 4145 KiB  
Article
“Green” Synthesis and Antioxidant Activity of Thermally Stable Gold Nanoparticles Encapsulated in Carbon Nanosheets
by Hui-Wen Lin, Jia-Yi Wang, Vincent K. S. Hsiao and Chih-Chien Chu
Appl. Sci. 2020, 10(7), 2272; https://doi.org/10.3390/app10072272 - 26 Mar 2020
Cited by 2 | Viewed by 1928
Abstract
We have developed a “green” method for fabricating gold nanoparticles (AuNPs) through biogenic approaches. The proposed method has the advantages of facile preparation under ecofriendly conditions. AuNPs encapsulated in carbon nanosheets, and exhibiting high thermal stability, were fabricated by autoclaving pectin-capped AuNPs, which [...] Read more.
We have developed a “green” method for fabricating gold nanoparticles (AuNPs) through biogenic approaches. The proposed method has the advantages of facile preparation under ecofriendly conditions. AuNPs encapsulated in carbon nanosheets, and exhibiting high thermal stability, were fabricated by autoclaving pectin-capped AuNPs, which were subsequently collected through high-speed centrifugation and redispersed in aqueous solution. The 1,1-diphenyl-2-picrylhydrazy (DPPH) radical scavenging assay indicated that our prepared AuNPs exhibited more prolonged antioxidant capacity than pristine apple extracts. Electron paramagnetic resonance (EPR) spectra showed that approximately 80% of DPPH radicals were scavenged by the pectin-capped AuNPs at a concentration of 3 mg/mL. According to our results, AuNPs prepared through biogenic approaches have potential use in the food industry. Full article
(This article belongs to the Special Issue Nano-Biophotonics in Sensing Using Nanostructures)
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