HOW MUCH sensitivity for nickel nanoparticles in silicon porous for enhancement?
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The sensitivity enhancement achieved for nickel nanoparticles in silicon porous structures varies based on the specific application. For instance, in the context of DNA detection, a minimum detection concentration of 10 pM was reported for metal nanoparticles in a porous silicon microcavity, showcasing high sensitivity . In another study focusing on pH sensing, a significant enhancement in pH sensitivity of 5.33% to 6.87% was achieved by utilizing a dual surface roughening scheme with nickel oxide nanosheets on silicon substrates . Additionally, the incorporation of nickel nanoparticles into porous silicon-nickel nanocomposites demonstrated improved thermal stability up to 900°C, enhancing their applicability in thermal isolation processes . Furthermore, the utilization of nickel oxide nanoparticles on silicon nanosheets resulted in enhanced cycling stability for lithium-ion batteries, showcasing better charge transfer processes and mechanical stability .
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| Papers (5) | Insight |
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16 Nov 2018 | Nickel nanoparticles on porous carbon-silica matrix exhibit a sensitivity of 585 µA/mM cm−1 for glucose detection, showcasing enhanced electrocatalytic properties in the sensor development. |
18 Feb 2020 | The nickel oxide nanoparticles decoration on silicon enhances sensitivity due to improved charge transfer, reduced agglomeration, and enhanced Li-ion transport, leading to high electrochemical performance in LIBs. |
| The nickel nanoparticles in porous silicon show enhanced thermal stability up to 900°C, indicating high sensitivity to improve thermal properties for applications requiring thermal isolation. | |
| The sensitivity enhancement for NiO nanosheets on KOH-etched Si substrate is 56.5 mV/pH, showing a 5.33% and 6.87% improvement compared to planar Si and sputtered NiO on KOH-etched Si, respectively. | |
| The sensitivity for DNA detection using gold nanoparticles in porous silicon microcavity was achieved down to 10 pM, showcasing high sensitivity in fluorescence enhancement. |
Related Questions
What is the size of Nickel Nanoparticle when exposed in methane diffusion flame?5 answersThe size of nickel nanoparticles when exposed in a methane diffusion flame varies significantly depending on the specific conditions and methodologies employed in their synthesis and application. For instance, in the context of dry reforming of methane (DRM) and methane cracking processes, the size of nickel (Ni) nanoparticles can be influenced by the support material, the method of catalyst preparation, and the reaction conditions.
In the synthesis of carbon nanotubes via the methane diffusion flame method, the size of nickel particles on the substrate surface did not directly affect the diameters of the carbon nanotubes produced, suggesting that the nickel nanoparticle size might remain relatively consistent under these conditions. However, during the characterization of nanoparticles generated by a laminar methane jet diffusion flame, particle size distributions indicated that the size of particles, including those potentially containing nickel, could evolve within the flame, showing a complex behavior of nucleation, growth, and oxidation, with median diameters reaching up to 10 nm before oxidation.
In a study focused on the cracking of methane into carbon nanotubes and hydrogen using metallic nickel nanoparticles, the average size of nickel agglomerates produced at around 350°C was reported to be in the range of 10–80 nm. This variation in size underscores the impact of thermal treatment and reaction conditions on the size of nickel nanoparticles.
Moreover, the size of nickel nanoparticles can also be influenced by the method of catalyst preparation, as seen in the development of a stable Ni-CeO2/SiO2 catalyst for dry reforming of methane, where nickel particles were confined by CeO2 particles and highly dispersed, maintaining a size of less than 5 nm during the reaction.
These findings collectively highlight that the size of nickel nanoparticles exposed in methane diffusion flames can vary widely, influenced by factors such as the catalyst support material, preparation method, and specific reaction conditions. The reported sizes range from less than 5 nm to approximately 80 nm, depending on the synthesis and application context.
How does methane diffusion flame produced Ni nanoparticle on SiO2 bead ranging from 15nm to 30nm?5 answersThe production of Ni nanoparticles on SiO2 beads through methane diffusion flames involves a complex interplay of chemical reactions, material properties, and fabrication techniques, as evidenced by various research findings. The use of silica (SiO2) as a support material plays a crucial role in the dispersion and stabilization of Ni nanoparticles, which are key to achieving the desired size range of 15nm to 30nm.
The decoration of Ni surfaces by SiO2 has been shown to significantly alter the electronic properties of Ni particles, mimicking noble metal catalyst behavior in methane dry reforming processes. This alteration is achieved through interfacial confinement, which helps in preventing carbon deposition on Ni nanoparticles. Similarly, the preparation of Ni-CeO2/SiO2 catalysts via a one-step colloidal solution combustion method demonstrates the importance of spatial confinement and the dispersion of small Ni particles on SiO2 surfaces, contributing to the stability and activity of the catalysts.
The flame spray pyrolysis (FSP) technique, particularly the asymmetrically variable double-FSP system, has been utilized to control the SiO2 interaction with other components, such as ceria-zirconia, to support Ni for methane reforming. This method allows for the regulation of silica's integration, affecting the size and dispersion of Ni nanoparticles. Moreover, the reverse microemulsion approach for depositing SiO2 onto Ni nanoparticles indicates that the etching and embedding process can produce Ni nanoparticles with a controlled size, embedded within a SiO2 matrix.
Sequential treatment methods, including hydrogen treatment followed by air calcination, have been employed to prepare Ni/SiO2 catalysts with uniform and small Ni particle sizes, demonstrating the effectiveness of such treatments in achieving desired nanoparticle sizes and distributions. The facile combustion method further supports the formation of smaller Ni nanoparticles on SiO2, emphasizing the role of synthesis conditions in controlling nanoparticle size.
The use of KIT-6 silica with well-ordered three-dimensional mesopores as a support for nickel-based catalysts highlights the impact of support structure on Ni nanoparticle dispersion and size control. Flame spray pyrolysis (FSP) has also been shown to effectively control silica support characteristics, which in turn influences the size and dispersion of Ni nanoparticles. The impregnation of mesoporous silica SBA-15 with a molecular, metalorganic [Ni4O4] cubane cluster as a precursor for NiO nanoparticles preparation illustrates the potential for preorganizing Ni atoms on the support surface, affecting the final size of Ni nanoparticles. Lastly, the general strategy of employing porous supports to prevent the aggregation and growth of metallic nanoparticles underscores the importance of support material and fabrication method in achieving the desired nanoparticle size range.
In summary, the production of Ni nanoparticles on SiO2 beads ranging from 15nm to 30nm through methane diffusion flames involves a combination of material selection, specifically the use of SiO2 as a support, and advanced fabrication techniques such as FSP, colloidal solution combustion methods, and sequential treatment methods. These approaches facilitate the control over Ni nanoparticle size, dispersion, and stability, which are critical for their application in catalysis and other industrial processes.
What are the Preparation and properties of Ni nanowires?5 answersNi nanowires can be prepared using various methods such as template-assisted electrochemical deposition, hydrothermal reaction with gallic acid as a reducing agent, or a full-liquid phase chemical reaction process with bivalent Ni salt and a template agent. The properties of Ni nanowires include their mechanical behavior, which is influenced by crystallographic orientation, with different orientations exhibiting varying yield stresses and deformation mechanisms. Additionally, the size, length, and electrical conductivity of Ni nanowires are crucial properties. For example, Ni nanowires synthesized through different methods exhibit varying diameters, surface textures, and growth lengths, with the growth length improving with higher heating temperatures but decreasing with high stabilizer agent concentrations. These properties make Ni nanowires promising for various applications requiring tailored mechanical and electrical characteristics.
What is the isoelectric point of Ni nanoparticles in water?4 answersThe isoelectric point of Ni nanoparticles in water is not mentioned in the abstracts provided.
How can nanoparticle-assisted PCR be used to improve the sensitivity of DNA detection?3 answersNanoparticle-assisted PCR can improve the sensitivity of DNA detection by enhancing the detection limits and specificity of the assay. This approach involves the use of nanoparticles, such as gold nanoparticles, in the PCR reaction to label the target DNA and enhance the signal. The nanoparticles can bind to the amplified DNA, allowing for easier detection and quantification. Additionally, nanoparticle-assisted PCR can increase the sensitivity of the assay compared to conventional PCR, enabling the detection of lower concentrations of DNA. The use of nanoparticles can also improve the specificity of the assay by reducing cross-reactions with other DNA sequences. Overall, nanoparticle-assisted PCR provides a more sensitive and specific method for DNA detection, making it useful in various applications such as clinical diagnosis, field surveillance, and environmental monitoring.
How can nickel nanoparticles be synthesized?5 answersNickel nanoparticles can be synthesized using various methods. One method involves the use of a hydrothermal process with nickel(II) chloride hexahydrate as a precursor and borane-ammonia complex as a reducing agent. Another method involves the reduction of nickel acetate with hydrazine hydrate. Additionally, nickel oxide nanoparticles can be prepared using a hotplate combustion process with Calotropis gigantea leaf extract as a fuel. A polyol mediated aqueous route of sol-gel process can also be used, where nickel nitrate hexahydrate is used as a precursor and calcination at different temperatures is performed to control the structure and morphology of the nanoparticles. Finally, nickel and nickel phosphide nanoparticles can be synthesized via thermal decomposition of nickel-oleylamine-phosphine complexes in organic solvents, with the size and composition easily controlled by adjusting various parameters.