Development of a New Humidity Sensor Based on (Carboxymethyl Cellulose–Starch) Blend with Copper Oxide Nanoparticles

Abstract

We have synthesized a nanocomposite of a new type as a humidity sensor and studied its electric and optical properties. The carboxymethyl cellulose-starch-copper oxide nanocomposite is prepared with different concentrations of copper oxide nanoparticles. The DC electric conductivity of the carboxymethyl cellulose-starch-copper oxide system was tested at room temperature. The results show that the DC conductivity of the blend increases with the copper oxide concentration. The optical properties of the nanocomposite are measured in the range of wavelengths (220-800) nm. The results show that the absorbance of the blend increases with the concentration of copper oxide nanoparticles, whereas the energy band gap decreases. With the purpose to use the system as a humidity sensor, its electric capacitance was measured on different samples in the range of humidity (40-90) RH%. The experimental results have shown that the carboxymethyl cellulose-starch-copper oxide nanocomposite has a higher sensivity in the humidity range (60-90) RH%.

Analysis of Optical, Electronic and Spectroscopic properties of (Biopolymer-SiC) Nanocomposites For Electronics Applications

“…As a result, it shows that absorption increases by increasing the number of atoms, this is due to the excitations of donor level electrons to the conduction band at these energies. The high absorbance of samples for nanocomposites at UV-Vis region attributed to the energy of photon enough to interact with atoms; the electron excites from a lower to higher energy level by absorbing a photon of known energy [28][29][30][31][32][33][34][35][36]. This behavior consistent with the results of researchers [37].…”

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“…Figure 4 shows a variation of the dc electrical specific conductivity for (PVA-PAA-PbO 2 ) nanocomposites with the concentration of PbO 2 nanoparticles at room temperature. From the figure, the dc electrical specific conductivity of the (PVA-PAA) blend increases with theconcentration of PbO 2 nanoparticles, which may be attributed to an increase in the number of free charge carriers [21][22][23]. Figure 5 shows a variation of the electrical resistance for (PVA-PAA-PbO 2 ) nanocomposites with the pressure at different concentrations of PbO 2 nanoparticles.…”

Fabrication Polyvinyl alcohol - Poly-Acrylic acid/ Niobium Carbide New Bio-Films for Antibacterial Applications

“…Nanocomposites materials have properties combine the properties of the filler and matrix. The new material has applications in fields: antibacterial [6][7][8][9][10][11], humidity sensors [12][13][14][15][16][17], pressure sensors and piezoelectric [18][19][20][21][22], radiation shielding [23][24][25] and thermal energy storage and release [26][27][28][29]. Niobium carbide is type of transition metals carbides which has unique properties resembling with metal and ceramic constituents and used in many technological applications due to their high strength, durability [30].…”