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An eco-friendly method to enhance optical and electrical properties of conducting polymers by means of carboxymethyl cellulose
摘要： In this work, an eco-friendly method is proposed for the electro-synthesis of conductive polymers with superior optical and electrical properties by means of CMC in aqueous media. For this purpose, an aqueous dispersion of a water-insoluble monomer namely 4-amino-N-[2,5-di(thiophen-2-yl)-1H-pyrrol-1-yl]benzamide (TPB) has been prepared by attaching it to CMC via hydrogen bonds and the conductive composite film (PTPB–CMC) has been obtained by electropolymerization. The TPB monomer has been chosen to interact with the CMC via hydrogen bonds which ensures to obtain dispersion with the CMC and also increase the compatibility of its polymer in the composite structure. As a result of the electrochemical, spectroelectrochemical investigation and surface morphology analyses of the obtained conductive polymer, it has been found that anionic CMC makes improvements in the electrical, optical and mechanical properties of the polymer by making the plasticizing effect and acting as a dopant. Furthermore, in the presence of nanocarbon materials on electrode surface, it has been determined that the polymerization potential reduced and more stable and long-lasting polymeric films which are crucial for technological applications have been obtained.
关键词： Electrochemical polymerization,Composite materials,Conducting polymers,Carboxymethyl cellulose
更新于2025-09-23 15:23:52
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An optical fiber sensor based on carboxymethyl cellulose/carbon nanotubes composite film for simultaneous measurement of relative humidity and temperature
摘要： In this paper, a carboxymethyl cellulose (CMC)/carbon nanotubes (CNTs) composite film was manufactured and used as a good humidity sensitive material to design a humidity and temperature simultaneous measurement sensor with simple structure, high sensitivity and fast response time. The sensor is constructed by a fiber Bragg grating (FBG) and then connected a hollow-core fiber (HCF) on the end face of which coated a CMC/CNTs hydrogel composite film. Through contrast experimental tests, the results show that the humidity sensitivity of the sensor with CMC film is 170.55 pm/%RH, while the sensitivity of the sensor with CMC/CNTs composite film is 230.95 pm/%RH. The humidity-insensitive FBG can be used to obtain accurate temperature information, and the temperature sensitivity is 26.35 pm/?C. This paper not only proves that CMC is an excellent humidity sensitive material for optical fiber sensors but also proves that carbon nanotubes can increase the humidity sensitivity of the hydrogel film effectively. This temperature and humidity simultaneous measurement sensor has a good application prospect.
关键词： Optical fiber sensor,Carbon nanotubes,Carboxymethyl cellulose,Humidity and temperature
更新于2025-09-23 15:21:01
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Synthesis, DFT studies, fabrication, and optical characterization of the [ZnCMC] <sup>TF</sup> polymer (organic/inorganic) as an optoelectronic device
摘要： A novel carboxymethyl cellulose zinc thin film [ZnCMC]TF was fabricated using the sol–gel technique. Different characterization techniques such as Fourier-transform infrared spectroscopy (FTIR), Raman spectroscopy, ultraviolet–visible spectroscopy (UV-Vis), X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDX), and the optical properties were used to study the properties of [ZnCMC]TF. The molecular structure, FTIR, and optical properties were optimized. The Raman spectrum of the [ZnCMC]TF complex shows several bands in the range of 72–556 cm?1 due to (nZn–O) stretching and (Zn–O) bending, which is an obvious distinction between the FTIR and Raman spectra of [ZnCMC]TF. The optimization was performed using density functional theory (DFT) by DMol3 and Cambridge Serial Total Energy Package (CASTEP) program. The chemical structure was confirmed by spectroscopic and structural properties for both CMC and [ZnCMC]TF; the XRD results showed the same crystal structure (Monoclinic 2). [ZnCMC]TF has a larger grain size than CMC and has a similar behavior in the optical gap energy. The optical constants increased with increasing photon energy, refractive index n, absorption index k, and optical conductivity. The SEM images provide very good evidence in favor of the reaction of zinc transition metal with CMC for the formation of the [ZnCMC]TF complex. The resulting [CMC] spherical thin film and the [ZnCMC]TF polymeric nanorods were examined by different techniques including TEM and EDX. The optical properties obtained from the simulated FTIR, XRD, and CASTEP are in good agreement with those obtained from the experimental studies on CMC and ZnCMC. Based on the optical findings, [ZnCMC]TF is a promising candidate in applications such as solar cells and optoelectronic devices.
关键词： TEM,DMol3,zinc thin film,carboxymethyl cellulose,UV-Vis,DFT,optoelectronic devices,XRD,EDX,CASTEP,sol–gel technique,SEM,FTIR,optical properties,Raman spectroscopy
更新于2025-09-23 15:21:01
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Multivalent Biopolymer Capped Gold Nanoparticles as Stable and Non-Specific Endocytosis-Free Cell Labeling Agents
摘要： In this study, we report that carboxymethyl cellulose (CMC) is a stable capping agent for cellular labeling with gold nanoparticles (AuNPs). AuNPs were easily capped with CMC by simply mixing them and removing any unbound CMC by centrifugation. The CMC-capped AuNPs showed high stability in the presence of up to 100 mM of NaCl and (cid:1)-mercaptoethanol. Structural analysis of CMC-capped AuNPs revealed that multiple binding of CMC on AuNPs resulted in the stable protection. For specific cell labeling, anti-CD44 antibody was conjugated to CMC-capped AuNPs. Cellular labeling performance of the antibody-conjugated AuNPs was verified by adding these nanoparticles to HeLa cell containing culture. We observed light scattering spots from AuNPs inside HeLa cells, which were incubated with the antibody-conjugated AuNPs without non-specific endocytosis. However, clusters of citrate-capped AuNPs were found to be entrapped inside the cells through receptor-mediated endocytosis. In addition, no cytotoxicity was observed, confirming that CMC-capped AuNPs are useful as stable and biocompatible cell-labeling agents.
关键词： Endocytosis,Gold Nanoparticle,Darkfield,Carboxymethyl Cellulose,Cancer,Cellular Labeling Agent,CD44
更新于2025-09-04 15:30:14