- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Organic Solar Cells Based on Cellulose Nanopaper from Agroforestry Residues with Efficiency over 16% and Effectively Wide Angle Light Capturing
摘要： Cellulose nanopaper (CNP) was successfully demonstrated for the enhanced efficiency and effectively wide-angle light capturing of organic solar cells (OSCs). The highest power-conversion efficiency (PCE) is up to 16.17%, which is among the excellent results natural materials for OSCs. The effectively wide-angle harvesting is demonstrated in the range from -45 to 45 degrees. Importantly, when the incident angle is 45o, the JSC with CNP is 21.18 mA/cm2, while the corresponding JSC without CNP is only 15.11 mA/cm2, an increase of ~40% is observed. The present PCEs of are found to be enhanced from 9.12% to 12.78%.
关键词： power-conversion efficiency,wide-angle harvesting,organic solar cells,light capturing,Cellulose nanopaper
更新于2025-09-19 17:13:59
-
Preparation and Photocatalytic Properties of a Bagasse Cellulose-Supported Nano-TiO2 Photocatalytic-Coupled Microbial Carrier
摘要： Intimate coupling of photocatalysis and biodegradation (ICPB) has shown promise in removing unwanted organic compounds from water. In this study, bagasse cellulose titanium dioxide composite carrier (SBC-TiO2) was prepared by low-temperature foaming methods. The optimum preparation conditions, material characterization and photocatalytic performance of the composite carrier were then explored. By conducting a single factor test, we found that bagasse cellulose with a mass fraction of 4%, a polyvinyl alcohol solution (PVA) with a mass fraction of 5% and 20 g of a pore-forming agent were optimum conditions for the composite carrier. Under these conditions, good wet density, porosity, water absorption and retention could be realized. Scanning electron microscopy (SEM) results showed that the composite carrier exhibited good biologic adhesion. X-ray spectroscopy (EDS) results confirmed the successful incorporation of nano-TiO2 dioxide into the composite carrier. When the mass concentration of methylene blue (MB) was 10 mg L?1 at 200 mL, 2 g of the composite carrier was added and the initial pH value of the reaction was maintained at 6, the catalytic effect was best under these conditions and the degradation rate reached 78.91% after 6 h. The method of preparing the composite carrier can aid in the degradation of hard-to-degrade organic compounds via ICPB. These results provide a solid platform for technical research and development in the field of wastewater treatment.
关键词： photocatalytic performance,bagasse cellulose–nano TiO2 composite carrier,characterization,intimate coupling of photocatalysis and biodegradation
更新于2025-09-19 17:13:59
-
Transparent Cellulose Nanofibrils Composites with Two-layer Delignified Rotary-cutting Poplar Veneers (0?°-layer and 90?°-layer) for Light Acquisition of Solar Cell
摘要： Our transparent cellulose nanofibrils composites (TCNC) directly from rotary-cutting poplar veneer (RPV) whose lignin can be easily stripped by our treatment. This TCNC is prepared by stripping lignin of original RPV and infiltrating epoxy resin (ER) into delignified RPV. This TCNC with two-layer delignified RPVs whose grains perpendicular (0/90°) to each other, which were solidified on solar cell while infiltrating ER. This TCNC with high transmittance (~90%), high haze (~90%), and equal refractive index fluctuation. Comparing with epoxy resin (ER), this TCNC can enhance open circuit voltage (VOC) from 1.16 to ~1.36 and short circuit density (JSC) from 30 to ~34 for the solar cell, and can enhance test fore from 0.155 kN to ~0.185 kN and displacement from 43.6 mm to ~52.5 mm.
关键词： light acquisition,rotary-cutting poplar veneer,delignification,epoxy resin,solar cell,transparent cellulose nanofibrils composites
更新于2025-09-19 17:13:59
-
Plasmonic nanopapers: flexible, stable and sensitive multiplex PUF tags for unclonable anti-counterfeiting applications
摘要： Highly flexible and stable plasmonic nanopaper comprised of silver nanocubes and cellulose nanofibres was fabricated through a self-assembly-assisted vacuum filtration method. It shows significant enhancement of the fluorescence emission with an enhancement factor of 3.6 and Raman scattering with an enhancement factor of ~104, excellent mechanical properties with tensile strength of 62.9 MPa and Young’s modulus of 690.9 ± 40 MPa, and a random distribution of Raman intensity across the whole nanopaper. The plasmonic nanopapers were encoded with multiplexed optical signals including surface plasmon resonance, fluorescence and SERS for anti-counterfeiting applications, thus increasing security levels. The surface plasmon resonance and fluorescence information are used as the first layer of security and can be easily verified by the naked eye, while the unclonable SERS mapping is used as the second layer of security and can be readily authenticated by Raman spectroscopy using a computer vision technique.
关键词： cellulose nanofibres,fluorescence enhancement,silver nanocubes,anti-counterfeiting,SERS,plasmonic nanopaper
更新于2025-09-19 17:13:59
-
Enhanced photoresponse characteristics of ZnO polymer nanocomposite: effect of variation of surface density of nanocrystals
摘要： Zinc oxide (40–100 nm size) nanocrystals were successfully grown on the surface of an organic polymer (cellulose) by a low-cost solution casting method. Zinc precursor (zinc nitrate hexahydrate) concentration was varied from 25–75 mM, to synthesize several sets of ZnO-cellulose nanocomposite (ZCNC). The morphology and size of the nanocrystals were studied by a field emission scanning electron microscope and due to variation in the precursor concentration, a significant change in the surface density of the nanocrystals was observed. The maximum surface density was perceived at a precursor concentration of 50 mM. The Brunauer–Emmett–Teller (BET) surface areas of the ZCNCs were estimated by the nitrogen adsorption–desorption method, and a maximum surface area of 2.861 m2/g was observed. The structure, as well as composition of the nanocomposite, were studied by X-ray diffraction and energy dispersive X-rays analysis, respectively. The electrical properties of the composite were studied by current–voltage measurement while the photoresponse was recorded by time resolve photocurrent measurement. The photocurrent of the ZCNC sensor device increased from 6.783 × 10?8 to 4.91 × 10?6 A under UV illumination. The UV response (IUV/IDark) and sensitivity of the device were 72.38 and 7138, respectively. Also, the photocurrent rise time and decay time were 8 s and 9 s, respectively. The enhanced photoresponse with short response time observed for the ZnO-cellulose nanocomposite may lead to the fabrication of inexpensive ultraviolet sensors.
关键词： photoresponse,cellulose,nanocomposite,UV sensor,ZnO
更新于2025-09-19 17:13:59
-
Exergoeconomic analysis of a solar photovoltaic-based direct evaporative air-cooling system
摘要： The target of this work is to perform the exergoeconomic analysis of a solar photovoltaic-based direct evaporative air-cooling system. The system was investigated experimentally with different thicknesses of cellulose and straw pads. For inlet air rates up to 1000 m3/h, the maximum changes in the humidity and temperature of outlet air are achieved by a pad with a thickness of 30 cm. A comprehensive mathematical model was developed for the system and the exergoeconomic analysis of the system was carried out. The influence of the effective parameter on the performance of the system was investigated. For an inlet air with a temperature of 30 °C and relative humidity of 30%, the maximum system exergy efficiency was obtained about 20%. With changes in the water temperature from 15 to 27 °C, inlet air rate from 300 to 1500 m3/h, and inlet air temperature from 26 to 34 °C, the system exergoeconomic factor changes up to 60%. The current system was compared with a conventional system and results showed that for four early years of systems lifetime, the exergoeconomic factor of the conventional system is greater than the solar system due to its lower initial investment, and for later years is lower due to its larger operating cost.
关键词： Cellulose and straw pads,Mathematical modeling,Exergoeconomic analysis,Solar photovoltaic panel,Direct evaporative air-cooling
更新于2025-09-16 10:30:52
-
An Eco-Friendly Disposable Plasmonic Sensor Based on Bacterial Cellulose and Gold
摘要： In several application fields, plasmonic sensor platforms combined with bio-receptors are intensively used to obtain biosensors. Most of these commercial devices are based on a disposable chip. Usually a gold chip, functionalized with a specific bio-receptor, inside a costly sensor system, is used. In this work, we propose a low-cost and small-size sensor system, used for monitoring a disposable plasmonic chip, based on an innovative optical waveguide made of bacterial cellulose (BC). In particular, we have sputtered gold on the green slab waveguide that is able to excite localized surface plasmon resonance (LSPR). Experimental results are presented on the capabilities of using the BC-based composite as an eco-friendly plasmonic sensor platform, which could be exploited for realizing disposable biosensors. The sensor has been used with optical fibers and simple equipment. More specifically, the fibers connect the green disposable LSPR sensor with a light source and with a spectrometer. The novel plasmonic sensing approach has been tested using two different optical waveguide configurations of BC, with and without ions inside BC.
关键词： bacterial cellulose,localized surface plasmon resonance,eco-friendly disposable sensors,optical sensors,sustainable development
更新于2025-09-16 10:30:52
-
Fabrication of Carbon-decorated Al<sub>2</sub>O<sub>3</sub> Composite Powders using Cellulose Nanofiber for Selective Laser Sintering
摘要： In this study, systematic investigation using cellulose nanofiber (CellNF) as a carbon source for selective laser sintering (SLS) of Al2O3 was conducted. A composite powder that consisted of CellNF and Al2O3 was fabricated using electrostatic adsorption (EA) method in aqueous suspension. Heat-treatment temperature of 500 and 800°C was compared for the conversion of CellNF to carbon residue (CR) in the Al2O3 composite. After that, the parameters involving the volume fraction of CR and effect of Al2O3 particle size in the CR-Al2O3 composite particle were also investigated in order to obtain an optimized condition of the CR-Al2O3 composite particle for SLS. From the results obtained, 1.5 wt% CR-Al2O3 with alumina size of 0.8 μm that was heat-treated at 800°C exhibited optimum laser sinter ability owing to the good CR distribution over a higher surface area that promoted good laser adsorption for the alumina sintering.
关键词： additive manufacturing,nano-assembly technique,selective laser sintering,cellulose nanofiber,electrostatic adsorption
更新于2025-09-16 10:30:52
-
Enhancing the sensitivity of a surface plasmon resonance-based optical sensor for zinc ion detection by the modification of a gold thin film
摘要： Surface plasmon resonance (SPR) sensors as novel optical sensors for the detection of a variety of analytes have been receiving increasing attention and their sensitivity has become the research hotspot recently. In this study, the sensitivity of an SPR optical sensor was enhanced by modifying a gold thin film with a nanocrystalline cellulose (NCC)-based material for zinc ion (Zn2+) detection that exists in the environment due to industrial processing. By replacing the gold thin film with a novel modified-gold thin film, Zn2+ can be detected from the range of 0 to 10 ppm using SPR. It is believed that the Zn2+ may interact with the negative charge molecules that exist on the modified-gold thin film, and this was confirmed via X-ray photoelectron spectroscopy (XPS). Moreover, this modified-gold-SPR has a high sensitivity of 1.892° ppm?1 up to 0.1 ppm with an enhanced detection of Zn2+ as low as 0.01 ppm. The SPR results also followed the Langmuir isotherm model with a binding affinity of 1.927 × 103 M?1, which further confirmed the sensitivity of the SPR sensor. In addition, using the modified-gold thin film, SPR has a higher affinity towards Zn2+ compared to other metal ions, i.e. Ni2+, Fe2+, Cr2+, Mn2+, and Co2+.
关键词： optical sensor,Surface plasmon resonance,nanocrystalline cellulose,gold thin film,zinc ion detection
更新于2025-09-16 10:30:52
-
Laser Light Scattering Study on Aggregation of Cellulose Diacetate in Acetone
摘要： We have investigated the properties of cellulose diacetate in solution by using laser light scattering. The cellulose diacetate molecules can form micelles and micellar clusters in acetone besides the individual chains. As the concentration increases, the average hydrodynamic radius (cid:104)Rh(cid:105) linearly increases, whereas the ratio of gyration radius to hydrodynamic radius (cid:104)Rg(cid:105)/(cid:104)Rh(cid:105) linearly decreases. It indicates that the micelles associate and form micellar clusters due to the intermolecular interactions.
关键词： Laser light scattering,Cellulose diacetate,Multi-aggregation form structure
更新于2025-09-16 10:30:52