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- Soltanmoradi, Reyhaneh, et al.
(author)
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Near-infrared light absorption and scattering based on a mono-layer of gold nanoparticles
- 2015
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In: Journal of the European Optical Society-Rapid Publications. - : European Optical Society. - 1990-2573. ; 10
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Journal article (peer-reviewed)abstract
- We report fabrication and characterization of large-area ultrathin near-infrared light absorbers and scatterers based on amono-layer of gold nanoparticles laying on top of a dielectric spacer and an aluminum reflector. The nanoparticles are formed through thermal annealing of an evaporated continuous gold film. Through optimization of initial gold-film thickness, spacer thickness, as well as annealing temperature we obtained samples that exhibit very low (~2%) broadband specular reflectance at near-infrared (NIR) wavelength range. By considering also diffuse reflection, we identify that the low specular reflectance can be due to either relatively high light absorption (~70%) or high light scattering (over 60%), with the latter achieved for samples having relatively sparse gold nanoparticles. Both strong absorption and scattering of NIR light are not inherent properties of the bulk materials used for fabricating the samples. Such composite optical surfaces can potentially be integrated to solar-energy harvesting and LED devices.
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| 2. |
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| 3. |
- Gao, Jiajia, et al.
(author)
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Light-induced electrolyte improvement in cobalt tris(bipyridine)-mediated dye-sensitized solar cells
- 2019
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In: Journal of Materials Chemistry A. - : Royal Society of Chemistry. - 2050-7488 .- 2050-7496. ; 7:33, s. 19495-19505
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Journal article (peer-reviewed)abstract
- Lithium-ion-free tris(2,2′-bipyridine) Co(ii/iii)-mediated electrolytes have previously been proposed for long-term stable dye-sensitized solar cells (DSSCs). Such redox systems also offer an impressive DSSC performance improvement under light soaking exposure, manifested by an increase in photocurrent and fill factor without the expense of decreasing photovoltage. Kinetic studies show that charge transfer and ion diffusion at the electrode/electrolyte interface are improved due to the light exposure. Control experiments reveal that the light effect is unambiguously associated with electrolyte components, [Co(bpy)3]3+ and the Lewis-base additive tert-butylpyridine (TBP). Electrochemical and spectroscopic investigation of the [Co(bpy)3]3+/TBP mixtures points out that the presence of TBP, which retards the electrolyte diffusion, however causes an irreversible redox reaction of [Co(bpy)3]3+ upon light exposure that improves the overall conductivity. This discovery not only provides a new strategy to mitigate the typical Jsc-Voc trade-off in Co(ii/iii)-mediated DSSCs but also highlights the importance of investigating the photochemistry of a photoelectrochemical system.
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| 4. |
- Maryana, Roni, et al.
(author)
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Reducing sugars and bioethanol production from oil palm empty fruit bunch by applying a batch and continuous pretreatment process with low temperature and pressure
- 2024
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In: Biomass Conversion and Biorefinery. - : Springer Nature. - 2190-6815 .- 2190-6823. ; 14:10, s. 11155-11164
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Journal article (peer-reviewed)abstract
- Exploring sustainable energy and chemical sources based on biomass has increased global interest. This study was focused on produce second-generation bioethanol using a new pretreatment process. The effectiveness of sodium hydroxide (NaOH) pretreatment on oil palm empty fruit bunch (OPEFB) for lignin removal, reducing sugar, and bioethanol production at low temperature and pressure was investigated using batch and continuous processes. Response surface methodology (RSM) was used to optimize the NaOH concentration and solid to liquor ratio (SL) at a maximum temperature of 100 degrees C and atmospheric pressure. The mathematical formula derived from RSM was based on 11 runs of the batch treatment. In the batch treatment process, 2 M NaOH, the temperature of 80 degrees C, and SL ratio of 8 have resulted in lignin removal of 38.7%, reducing sugars of 8.3%, and bioethanol concentration of 4.1%. The validation of formula has been calculated from calculation and experiment values. Moreover, at the same retention time, continuous pretreatment showed a reducing sugar content of 5.9% and a bioethanol concentration by 2.5%. The results show that the continuous process can be employed in effective bioethanol production from OPEFB.
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| 5. |
- Puerta, Rafael, et al.
(author)
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NR Conformance Testing of Analog Radio-over-LWIR FSO Fronthaul link for 6G Distributed MIMO Networks
- 2023
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In: Opt. Fiber Commun. Conf. Exhib., OFC - Proc.. - : Institute of Electrical and Electronics Engineers Inc..
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Conference paper (peer-reviewed)abstract
- We experimentally test the compliance with 5G/NR 3GPP technical specifications of an analog radio-over-FSO link at 9 μm. The ACLR and EVM transmitter requirements are fulfilled validating the suitability of LWIR FSO for 6G fronthaul. © 2023 The Author(s).
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