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Synthesis of novel azo group substituted polymeric phthalocyanine for amperometric sensing of nitrite
摘要： The novel tetraazo-bridged cobalt phthalocyanine polymer [poly(TazoCoPc)] was synthesized by oxy-bridge to extend the conjugation effect on the phthalocyanine molecule. Firstly, the ligand [phenyl-1,4-bisdiazenyl naphthalene-1-oxy] benzene 1,2-dicarbonitrile was prepared and it was characterized. Then, the polymeric phthalocyanine was prepared and characterized by elemental analysis, UV-Vis, FTIR, TGA, XRD and electrochemistry. Polymeric phthalocyanine and carbon nanoparticles (CNP) were mixed and used for modifying the glassy carbon electrode to fabricate the electrochemical voltametric and amperometric nitrite sensor. Composite of phthalocyanine polymer and CNP exhibits enhanced electrocatalytic behaviour for the oxidation of nitrite compared to pure polymeric phthalocyanine. The fabricated amperometric sensor exhibits excellent analytical performance for nitrite detection in the concentration range of 20 nM to 1 μM with a detection limit of 6 nM (S/N = 3) and a sensitivity of 0.137 mA/μM. The modified composite electrode is highly selective and it didn’t show any interference effect even in presence of excess interfering ions such as Mg2+, SO4 2-, K+, CO3 2-, NO3 -.
关键词： phthalocyanine polymer,nitrite sensor,amperometry,carbon nanoparticle,voltametry
更新于2025-09-23 15:21:01
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[IEEE 2018 15th IEEE India Council International Conference (INDICON) - Coimbatore, India (2018.12.16-2018.12.18)] 2018 15th IEEE India Council International Conference (INDICON) - Influence of the Compositional Variation of Zn <sub/>x</sub> Cd <sub/>1a??x</sub> S (0 a?¤ x a?¤ 0.45) Buffer on Efficiency of Cu <sub/>2</sub> ZnSnSe <sub/>4</sub> Solar Cell: A Simulation
摘要： This paper investigates the manufacturability-aware process of p-n junction formation for photovoltaic cells involving with Si nanoparticle layer. The furnace-based dopant diffusion process of forming a p-n junction consumes a substantial amount of energy. In addition, repetitive production steps prevent the possibility of Si ink-based cells integrating onto ?exible substrates. This research examined the local heating dopant diffusion process by using a ?ber laser at a wavelength of 1064 nm. The infrared beam is delivered onto the wafer stack with a nanoparticle carbon layer and n-type Si ink layer on p-type Si substrates. The nanoparticle carbon ?lm absorbs infrared beam energy and converts photon energy as a thermal source to diffuse the n-type dopant in Si ink into the p-type Si wafer. The Si ink in this paper contains a mixture of Si nanoparticles and an n-type spin-on dopant solution. The TEM results show that Si nanoparticles are uniformly dispersed on the Si wafer surface. This research investigated sheet resistance as a function of laser parameters, including laser power, scanning speed, and pulse frequency for the samples coated with Si ink. Secondary ion mass spectroscopy measurements indicate the presence of an n-type dopant in p-type substrates, with an approximate diffusion depth of 100 nm. The results indicate that the proposed infrared laser treatment technique is promising for the formation of p-n junctions with Si ink-based photovoltaic cells.
关键词： silicon ink,spin-on dopant (SOD),silicon nanoparticle,carbon nanoparticle,?ber laser,Flexible photovoltaic cell,pn junction
更新于2025-09-23 15:19:57
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Functionalized carbon dots on TiO2 for perovskite photovoltaics and stable photoanodes for water splitting
摘要： Various types of fluorescent carbon nanoparticles, often called carbon dots (CDs), are synthesized by different polycondensation methods: microwave irradiation, hydrothermal conditions or solution chemistry at ambient temperature with subsequent chemical functionalization. The CDs are deposited on TiO2 films to be probed as electron transport layers in perovskite photovoltaics and the anode for photoelectrochemical water splitting. Nitrogen CDs, which do not contain oxygen, lead to an increase of around 50 mV in the open circuit voltage of perovskite solar cells. All the CD types produce an improved photocurrent in water splitting, particularly CDs that are functionalized with thiol groups and butyl chains. It is demonstrated that the modified electrode is stable under continuous operation. Other electrochemical characteristics of the electrode, such as the voltammogram shape, onset potentials and open circuit potentials, remain nearly unchanged upon the deposition of CDs. Only the incident photon to current conversion efficiency improves clearly, extending the absorption range by around 20 nm towards longer wavelengths. This study provides new data about mechanisms and electrode arrangements for improving the performance of n-type semiconductors in photovoltaic cells and photoelectrochemical hydrogen production.
关键词： Sustainability,Titanium dioxide,Renewable hydrogen,Carbon nanoparticle,Solar energy
更新于2025-09-23 15:19:57
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[IEEE 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - Chicago, IL, USA (2019.6.16-2019.6.21)] 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - In Situ Transmission Electron Microscopy: A Powerful Tool for the Characterization of Carrier-Selective Contacts
摘要： This paper investigates the manufacturability-aware process of p-n junction formation for photovoltaic cells involving with Si nanoparticle layer. The furnace-based dopant diffusion process of forming a p-n junction consumes a substantial amount of energy. In addition, repetitive production steps prevent the possibility of Si ink-based cells integrating onto flexible substrates. This research examined the local heating dopant diffusion process by using a fiber laser at a wavelength of 1064 nm. The infrared beam is delivered onto the wafer stack with a nanoparticle carbon layer and n-type Si ink layer on p-type Si substrates. The nanoparticle carbon film absorbs infrared beam energy and converts photon energy as a thermal source to diffuse the n-type dopant in Si ink into the p-type Si wafer. The Si ink in this paper contains a mixture of Si nanoparticles and an n-type spin-on dopant solution. The TEM results show that Si nanoparticles are uniformly dispersed on the Si wafer surface. This research investigated sheet resistance as a function of laser parameters, including laser power, scanning speed, and pulse frequency for the samples coated with Si ink. Secondary ion mass spectroscopy measurements indicate the presence of an n-type dopant in p-type substrates, with an approximate diffusion depth of 100 nm. The results indicate that the proposed infrared laser treatment technique is promising for the formation of p-n junctions with Si ink-based photovoltaic cells.
关键词： Flexible photovoltaic cell,fiber laser,pn junction,spin-on dopant (SOD),silicon ink,carbon nanoparticle,silicon nanoparticle
更新于2025-09-19 17:13:59
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Organic WORM memory with carbon nanoparticle/epoxy active layer
摘要： Following the “All With One (AW1)” technology proposed in our earlier work, the present study is focused on the production and the characterization of write once read many (WORM) memory devices with a carbon nanoparticle/epoxy resin nanocomposite, where the main advantage stands on the ease of production of the nanostructured phase. The results revealed that short 100-ns, low-voltage (5.0-V) electric pulses are enough to record a bit, and the bit one to bit zero current state ratio ION∕IOFF reaches 107.
关键词： Organic WORM memory,epoxy resin,carbon nanoparticle,nanocomposite,electrical bistability
更新于2025-09-10 09:29:36