- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
3D, covalent and noncovalent hybrid materials based on 3-phenylcoumarin derivatives and single walled carbon nanotubes as gas sensing layers
摘要： In this work, the effect of different types of functionalization of single walled carbon nanotubes (SWCNT) with 3-phenylcoumarin derivatives on the chemiresistive sensor response to ammonia (10–50 ppm) was studied. Covalent functionalization of SWCNT was performed according to the Huisgen reaction of azide-alkyne 1,3-dipolar cycloaddition between mono alkyne-substituted 3-phenylcoumarin and single walled nanotubes modified by azide groups. Covalent functionalization was shown by IR- and X-ray photoelectron spectroscopy. To obtain the 3D hybrid material, the dialkyne functionalized 3-phenylcoumarin molecules were used as linkers between nanotubes. Third hybrid material was prepared by noncovalent functionalization of SWCNT, namely by adsorption of 7-propinyloxy-3-(p-propinyloxyphenyl)coumarin on SWCNT surface. It was shown that the 3D hybrid and the hybrid obtained by covalent functionalization exhibit 2 and 4 times higher sensor responses to ammonia compared to noncovalently functionalized SWCNT. The value of sensor response is in good correlation with the degree of functionalization of SWCNTs with coumarin molecules.
关键词： Non covalent functionalization,3D carbon nanostructures,Covalent functionalization,Carbon nanomaterials,Ammonia sensor,Coumarin
更新于2025-09-11 14:15:04
-
Magneto-Plasmonic Co@Pt@Au Nanocrystals for Biosensing and Therapeutics
摘要： Multifunctional nanoparticles (NPs) exhibiting high magnetic property and plasmonic resonance, are expected to be advanced nanomaterials which enable therapy, detection and diagnosis simultaneously for medical applications. To achieve the practical performance of the multifunctional NPs, the precise design and synthesis both are required. In this work, considering the chemical stability and controllability, Co-Pt@Au core-shell NPs, which exhibit high magnetic property and plasmonic resonance were theoretically designed based on calculation and then experimentally synthesized using alcohol reduction method. Co-Pt NPs were uniformly synthesized using a technique which enables reduction control of Pt through the formation of Pt-oleylamine complex. Moreover, depending on Co/Pt ratio, distribution of Co and Pt in a nanoparticle were precisely controlled, and as a result, Co-Pt alloy and Co@Pt core-shell NPs were individually prepared. In particular, Co@Pt NPs exhibit a high magnetic property and are suitable for Au coating due to a small lattice mismatch. In fact, Au coating onto Co@Pt NPs was successfully performed via inhomogeneous nucleation, which results in Co@Pt@Au NPs exhibiting plasmonic response of Au with high magnetic property and being dispersed in water by ligand-exchange for in-vivo use. The developed synthetic method enables designed synthesis of complicated multicomponent nanoparticles through tunable reduction reaction and provides highly potential NPs for transport and sensing applications.
关键词： Biomedical nanomaterials,Pt-Oleylamine complex,Magnetic and plasmonic properties,Magnetic transport,Alcohol reduction method,Sensing,Co@Pt@Au colloidal nanoparticles,Ligand exchange
更新于2025-09-11 14:15:04
-
Nanodiamonds: Emerging face of future nanotechnology
摘要： Remarkable advancements in nanostructured materials have been achieved through their integration into modern nanotechnology in almost every phase of society. Among nanomaterials, nanodiamonds (NDs) have become a subject of active research due to their attractive properties (e.g., large diameter, high thermal conductivity, hardness, resistance to friction, non-toxicity, small and tunable surface structure, high surface area, chemical inertness, and excellent optical/mechanical properties). These unique properties have expanded their applications, which extend to quantum optics, electrochemical coatings, antifriction coatings, antibacterial/antifungal coatings, polymer strengthening, bioimaging probes, implants, polishing, lubricants and fuels, drug delivery, catalyst supports, water cleaning processes, nano-magnetometry, and nano-electrometry. This paper is organized to critically review the diverse commercial applications of NDs, including their use in thin-film electronics, photovoltaic devices, energy storage devices, water treatment, nanofluids, and electrochemical sensors. This review covers the developmental history of carbon nanomaterials with a major emphasis on the structure and chemical nature of NDs, different synthesis techniques of NDs, and their associated properties. Our discussion also expands to describe current market challenges and future directions for the commercial application of NDs.
关键词： synthesis techniques,applications,nanodiamonds,nanotechnology,carbon nanomaterials
更新于2025-09-11 14:15:04
-
[IEEE 2018 XV International Scientific Conference on Optoelectronic and Electronic Sensors (COE) - Warsaw, Poland (2018.6.17-2018.6.20)] 2018 XV International Scientific Conference on Optoelectronic and Electronic Sensors (COE) - Array of Gas Sensors Based on TiO2 Upon Temperature Modulation
摘要： The aim of this work is to demonstrate that thermal modulation improves the selectivity of TiO2 – based resistive-type gas sensors. The sensors operate upon sinusoidal temperature profile over a temperature range of 240 – 300°C. Sensor array is composed of nanocrystalline TiO2:Cr (0.1 – 10 at.% Cr). The switching from n-type to p-type conductivity occurs at about 1 at. % Cr. Electrical resistance responses to reducing and oxidizing gases such as: NO, NO2, H2, CH4, C3H8 (0 – 3000 ppm) are dynamically recorded and compared in order to assess cross-sensitivity as well as humidity interference. The results of the Principle Component Analysis, PCA demonstrate that reliable detection and classification of H2, and NOx have been achieved.
关键词： sensors array,hydrogen detection,humidity,temperature modulation,TiO2:Cr nanomaterials
更新于2025-09-10 09:29:36
-
A Fully Transparent, Flexible, Sensitive, and Visible-Blind Ultraviolet Sensor Based on Carbon Nanotube-Graphene Hybrid
摘要： Transparent and flexible UV sensors have attracted considerable attention for use in portable/wearable optoelectronic systems. Although UV sensors based on photoactive nanomaterials have been reported for such applications, achieving full transparency and flexibility remains a challenge because they still rely on opaque or brittle electrodes. Here, a fully transparent, flexible, and highly sensitive UV sensor based on 1D carbon nanotubes (CNTs)–2D graphene hybrid is demonstrated. Under UV illumination, oxygen molecules on the CNT surfaces are desorbed by photoinduced plasmon energy, leading to a significant decrease in hole concentration, and correspondingly an increase in the electrical resistance of CNT. The combination of CNT and graphene minimizes the effect of contact resistance and facilitates effective charge transfer between them without potential barrier, resulting in a high photoresponse, which is 30 times as high as that of Au-electrode-based CNT sensor. Simultaneously, CNT–graphene UV sensor shows remarkable transparency (over 80% at 550 nm) and outstanding mechanical flexibility without any significant change in electrical resistance for 500 cycles at a bending radius of 5.5 mm. The integration of CNT–graphene hybrid onto flexible substrates through scalable microfabrication is expected to provide exciting opportunities for the development of high performance, optically and mechanically invisible optoelectronic devices.
关键词： contact resistance,transparency,flexibility,carbon nanomaterials,ultraviolet monitoring
更新于2025-09-10 09:29:36
-
Adhesion between graphene and polymers: A surface analysis perspective
摘要： Efficient adhesion between polymers and two-dimensional materials, such as graphene, is fundamental and crucial for the development of flexible devices or special coating materials as well as defining the quality of the transfer processes for these materials. Here, contact angle (CA) measurements of four distinct polymers, low-density polyethylene – LDPE, polypropylene – PP, poly (butylene adipate-co-terephthalate) – PBAT and poly (vinylidene-fluoride-co-trifluoroethylene) – PVDF-TrFE, and graphene achieved by chemical vapor deposition (CVD) were used to understand the adhesion phenomena between such materials. The CA measurements were carried out at specific thermal conditions mimicking a transfer process that is based on direct contact of CVD graphene and polymers above their melting temperature (Direct Dry Transfer – DDT). Surface analysis allowed the efficiency of such transfer method to be pre-estimated owing to an understanding of the adhesion properties of both materials by comparing their polar and dispersive components values. However, rheological properties and chemical structures seemed to be equally important in this evaluation, either by molecular weight modification or introduction of chemical groups onto the surface of polymer films. The results allowed for an understanding of the role of the main factors in adhesion phenomena between graphene and polymers and how they can be used to improve graphene coating during transfer processes.
关键词： graphene,coatings,adhesion,nanomaterials,polymers
更新于2025-09-10 09:29:36
-
Ionic liquid-mediated functionalization of graphene-based materials for versatile applications: a review
摘要： Industrial applications of the graphene (G) and graphene oxide (GO) can be further explored by making them more dispersible in the aqueous and organic environments. Several attempts have been performed to enhance the dispersity of the G and GO in which surface functionalization is one of the most effective methods. Recently, surface functionalization of G and GO using ionic liquids is gaining particular emphasis because of their high thermal and chemical stability, low volatility, very high ability to dissolve a wide range of compounds and more importantly their environmental-friendly behaviour. The covalent functionalization of G and GO is mostly being achieved by acylation, esterification, isocyanate formation, nucleophilic ring opening, amide formation, and diazotization and cycloaddition reactions. Non-covalent functionalization mostly involves electrostatic forces, hydrogen bonding, π–π interactions, van der Waals interaction and donor–acceptor interactions. Because of their high dipolar nature, ionic liquids strongly interact with the sp2-hydrodized carbon networks of G and GO sheets and make them more dispersible as compared to their native networks. In the present review article, we described the collection of reports available on covalent and non-covalent functionalization of G and GO using ionic liquids and their industrial applications. The ionic liquid-functionalized graphene (G-IL) and graphene oxide (GO-IL) are extensively used in pollutants decontamination, sensing and bio-sensing, lubrication, catalysis, and carbon dioxide capturing and hydrogen production. The G-IL and GO-IL represent an essential class of materials for versatile future applications.
关键词： Dispersibility,Functionalization,Nanomaterials,Ionic liquids,Graphene-based materials,Sustainable chemistry
更新于2025-09-10 09:29:36
-
Synthesis and Photocatalytic Activity of Nanosized Powder of Zn-Doped Titanium Dioxide
摘要： Nanosized powder materials made Zn-doped titanium dioxide with concentration of 0.1, 0.5, and 1.0 mol % Zn2+ have been synthesized from aqueous solutions of inorganic compounds of titanium modified with zinc(II) ions. The materials obtained have been studied by electron microscopy, thermogravimetric analysis, and powder X-ray diffraction. It has been found that if zinc ions introduced in titanium dioxide the stabilization of anatase modification takes place retaining size and morphology of particles. The materials synthesized have shown photocatalytic activity under ultraviolet and visible light irradiation. The highest photocatalytic activity has been found for material containing 0.1 mol % Zn2+ and calcined at 600°С.
关键词： photocatalytic activity,nanoparticles,titanium dioxide,nanomaterials
更新于2025-09-10 09:29:36
-
[Advances in Experimental Medicine and Biology] Biomimetic Medical Materials Volume 1064 (From Nanotechnology to 3D Bioprinting) || Graphene-Based Nanomaterials and Their Applications in Biosensors
摘要： Graphene has been drawing tremendous attraction since the crystal graphene had been first observed by Novoselov in 2004 based on scotch-tape method (Novoselov et al. 2004). The name of the one-atom thick 2-D material, graphene is composed of two concepts, graphite and -ene. The thickness of graphene is the separation distance of the graphite, which is 0.335 nm recording the thinnest among all the nanomaterials developed until now. Graphene is 100–300 times stronger than steel with its Young’s modulus of 0.5–1.0 TPa and intrinsic strength of 130 GPa (Lee et al. 2008). The electron mobility at room temperature is 2.5 (cid:1) 105 cm2 V(cid:3)1 s(cid:3)1 (Mayorov et al. 2011) with tis maximum current density reaching a few million times larger than copper (Liu et al. 2007). The single atom thick crystal material has high thermal conductivity of 3000 WmK(cid:3)1 (Balandin et al. 2008) and high optical transmittance of 97.7% (Nair et al. 2008). Rightly these superb properties contributed Nobel Prize for Physics in 2010 and have been widely used for applications including sensors, electronics, energies and biology.
关键词： Electrochemical Detection,Graphene,Nanomaterials,Biosensors,Quantum Dots
更新于2025-09-10 09:29:36
-
[Nanostructure Science and Technology] Nanowire Electronics || X-Ray Spectroscopic Analysis of Electronic Properties of One-Dimensional Nanostructured Materials
摘要： Recent studies of the control of the shape and size of nanomaterials have enabled researchers to explore the development of energy storage and conversion applications in unprecedented detail. Nanomaterials can be exploited into green energy strategies if their surface architectures can be controlled by various treatment processes. Their remarkable behaviors arise in part from their small size, large surface area, and quantum con?nement. Nanomaterial science has various implications for environmental science and sustainability. Physical and chemical routes for controlling morphologies, crystal structures, and physical and chemical properties can be exploited to improve performance, expand the function, and extend lifetime of devices with energy storage and conversion applications. Such devices that involve nanomaterials include storage and conversion devices (energy storage, hydrogen generation, water-splitting and dye-sensitized solar cells (DSSC)), optical and electronic devices (semiconductors, photoelectrocatalytic, and waveguides), and environmental devices (sensors and adsorption/separation), among others. Such applications typically rely on emerging electrode designs, which support the realization of energy storage and conversion devices, whose manufacture can be done more ef?ciently by nanotechnology. The unique features of nanomaterials have been in the development of energy storage and conversion proved to be useful.
关键词： supercapacitors,nanomaterials,conversion,water-splitting,X-ray absorption spectroscopy,energy storage,MnO2,TiO2
更新于2025-09-10 09:29:36