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Keywords = gold nanospikes

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14 pages, 7656 KiB  
Article
Gold Nanospikes Formation on Screen-Printed Carbon Electrode through Electrodeposition Method for Non-Enzymatic Electrochemical Sensor
by Isa Anshori, Raih Rona Althof, Lavita Nuraviana Rizalputri, Eduardus Ariasena, Murni Handayani, Arfat Pradana, Mohammad Rizki Akbar, Mas Rizky Anggun Adipurna Syamsunarno, Agnes Purwidyantri, Briliant Adhi Prabowo, Muhammad Sjahrul Annas, Hasim Munawar and Brian Yuliarto
Metals 2022, 12(12), 2116; https://doi.org/10.3390/met12122116 - 9 Dec 2022
Cited by 17 | Viewed by 4535
Abstract
In this study, we reported the construction of Gold Nanospike (AuNS) structures on the surface of screen-printed carbon electrode (SPCE) used for non-enzymatic electrochemical detection. This modification was prepared with a one-step electrodeposition method by controlling the electrodeposition parameters, such as applied potential [...] Read more.
In this study, we reported the construction of Gold Nanospike (AuNS) structures on the surface of screen-printed carbon electrode (SPCE) used for non-enzymatic electrochemical detection. This modification was prepared with a one-step electrodeposition method by controlling the electrodeposition parameters, such as applied potential and deposition time, via Constant Potential Amperometry (CPA). Those parameters and precursor solution concentration were varied to investigate the optimum electrodeposition configuration. The results confirmed that AuNS were homogenously deposited and well-dispersed on the working electrode surface of SPCE. The AuNS-modified SPCE was implemented as a non-enzymatic sensor toward dopamine and could enhance the electrocatalytic ability compared with the bare SPCE. Further examination shows that the sensing performance of the AuNS-modified SPCE produced an increase in electrochemical surface area (ECSA) at 17.25 times higher than the bare electrode, a sensitivity of 0.056 µA mM−1 cm−2 with a wide linear range of 0.2–50 µM and a detection limit of 0.33 µM. In addition, AuNS-modified SPCE can selectively detect dopamine among other interfering analytes such as ascorbic acid, urea, and uric acid, which commonly coexist in the body fluid. This work demonstrated that AuNS-modified SPCE is a prospective sensing platform for non-enzymatic dopamine detection. Full article
(This article belongs to the Section Metallic Functional Materials)
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10 pages, 3957 KiB  
Article
Polarization-Sensitive Surface-Enhanced In Situ Photoluminescence Spectroscopy of S. aureus Bacteria on Gold Nanospikes
by Irina Saraeva, Sergey I. Kudryashov, Pavel Danilov, Nikolay Busleev, Eteri R. Tolordava, Andrey A. Rudenko, Dmitriy Zayarny, Andrey Ionin and Yulia M. Romanova
Sensors 2020, 20(9), 2466; https://doi.org/10.3390/s20092466 - 27 Apr 2020
Cited by 7 | Viewed by 3261
Abstract
We report the possibility of a time-resolved bacterial live/dead dynamics observation with the use of plasmonic nanospikes. Sharp nanospikes, fabricated on a 500-nm thick gold film by laser ablation with the use of 1030-nm femtosecond pulses, were tested as potential elements for antibacterial [...] Read more.
We report the possibility of a time-resolved bacterial live/dead dynamics observation with the use of plasmonic nanospikes. Sharp nanospikes, fabricated on a 500-nm thick gold film by laser ablation with the use of 1030-nm femtosecond pulses, were tested as potential elements for antibacterial surfaces and plasmonic luminescence sensors. Staphylococcus aureus bacteria were stained by a live/dead viability kit, with the dead microorganisms acquiring the red colour, caused by the penetration of the luminescent dye propidium iodide through the damaged cell membrane. Photoluminescence was pumped by 515-nm femtosecond laser pulses with linear (Gaussian beam), circular, azimuthal and radial (Laguerre–Gaussian beam) polarizations, exciting the transverse plasmon resonance of the nanospikes and their apex lightning-rod near-field. According to the numerical electrodynamic modeling, the observed strong increase in the photoluminescence yield for radial polarization, while slightly lower for circular and azimuthal polarizations, compared with the low luminescence intensities for the linear laser polarization, was related to their different laser–nanospike coupling efficiencies. Full article
(This article belongs to the Special Issue Application of Raman Spectroscopy as Sensors for Direct in Vivo/in Situ Investigation)
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