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Search Results (3)

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Keywords = annealed ITO/AuNPs

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12 pages, 10796 KB  
Article
Demonstration of SWIR Silicon-Based Photodetection by Using Thin ITO/Au/Au Nanoparticles/n-Si Structure
by Xinxin Li, Zhen Deng, Ziguang Ma, Yang Jiang, Chunhua Du, Haiqiang Jia, Wenxin Wang and Hong Chen
Sensors 2022, 22(12), 4536; https://doi.org/10.3390/s22124536 - 16 Jun 2022
Cited by 10 | Viewed by 3579
Abstract
Plasmonic photodetection based on the hot-electron generation in nanostructures is a promising strategy for sub-band detection due to the high conversion efficiencies; however, it is plagued with the high dark current. In this paper, we have demonstrated the plasmonic photodetection with dark current [...] Read more.
Plasmonic photodetection based on the hot-electron generation in nanostructures is a promising strategy for sub-band detection due to the high conversion efficiencies; however, it is plagued with the high dark current. In this paper, we have demonstrated the plasmonic photodetection with dark current suppression to create a Si-based broadband photodetector with enhanced performance in the short-wavelength infrared (SWIR) region. By hybridizing a 3 nm Au layer with the spherical Au nanoparticles (NPs) formed by rapid thermal annealing (RTA) on Si substrate, a well-behaved ITO/Au/Au NPs/n-Si Schottky photodetector with suppressed dark current and enhanced absorption in the SWIR region is obtained. This optimized detector shows a broad detection beyond 1200 nm and a high responsivity of 22.82 mA/W at 1310 nm at −1 V, as well as a low dark current density on the order of 10−5 A/cm2. Such a Si-based plasmon-enhanced detector with desirable performance in dark current will be a promising strategy for realization of the high SNR detector while keeping fabrication costs low. Full article
(This article belongs to the Special Issue State-of-the-Art Optical Sensors Technology in China)
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13 pages, 3856 KB  
Article
Chemosensing on Miniaturized Plasmonic Substrates
by Pengcheng Wang and Rodica Elena Ionescu
Micromachines 2021, 12(3), 275; https://doi.org/10.3390/mi12030275 - 6 Mar 2021
Cited by 2 | Viewed by 2557
Abstract
Round, small-sized coverslips were coated for the first time with thin layers of indium tin oxide (ITO, 10–40 nm)/gold (Au, 2–8 nm) and annealed at 550 °C for several hours. The resulting nanostructures on miniaturized substrates were further optimized for the localized surface [...] Read more.
Round, small-sized coverslips were coated for the first time with thin layers of indium tin oxide (ITO, 10–40 nm)/gold (Au, 2–8 nm) and annealed at 550 °C for several hours. The resulting nanostructures on miniaturized substrates were further optimized for the localized surface plasmon resonance (LSPR) chemosensing of a model molecule—1,2-bis-(4-ppyridyl)-ethene (BPE)—with a detection limit of 10−12 M BPE in an aqueous solution. All the fabrication steps of plasmonic-annealed platforms were characterized using scanning electron microscopy (SEM) and atomic force microscopy (AFM). Full article
(This article belongs to the Special Issue Micro/Nano-surfaces: Fabrication and Applications)
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10 pages, 3325 KB  
Article
Microwave Spectroscopic Detection of Human Hsp70 Protein on Annealed Gold Nanostructures on ITO Glass Strips
by Rodica Elena Ionescu, Raphael Selon, Nicolas Pocholle, Lan Zhou, Anna Rumyantseva, Eric Bourillot and Eric Lesniewska
Biosensors 2018, 8(4), 118; https://doi.org/10.3390/bios8040118 - 27 Nov 2018
Cited by 1 | Viewed by 5690
Abstract
Conductive indium-tin oxide (ITO) and non-conductive glass substrates were successfully modified with embedded gold nanoparticles (AuNPs) formed by controlled thermal annealing at 550 °C for 8 h in a preselected oven. The authors characterized the formation of AuNPs using two microscopic techniques: scanning [...] Read more.
Conductive indium-tin oxide (ITO) and non-conductive glass substrates were successfully modified with embedded gold nanoparticles (AuNPs) formed by controlled thermal annealing at 550 °C for 8 h in a preselected oven. The authors characterized the formation of AuNPs using two microscopic techniques: scanning electron microscopy (SEM) and atomic force microscopy (AFM). The analytical performances of the nanostructured-glasses were compared regarding biosensing of Hsp70, an ATP-driven molecular chaperone. In this work, the human heat-shock protein (Hsp70), was chosen as a model biomarker of body stress disorders for microwave spectroscopic investigations. It was found that microwave screening at 4 GHz allowed for the first time the detection of 12 ng/µL/cm2 of Hsp70. Full article
(This article belongs to the Special Issue Immunoanalytical Tool with Electrochemical and Optical Detection)
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