“…However, the net spin polarization of the Zn 12 O 12 -based nanowire is not modified due to the adsorption of the other considered molecules. In this regard of the change of magnetic properties, the Zn 12 O 12 -based nanowire can be viewed as a highly sensitive gas detection technique based on the measurement of the local magnetic moment in the Zn 12 O 12 -based nanowire using various experimental methods such as AFM or SQUID magnetometry 77 – 79 . Figure 8 Spin density of the most stable configurations of ( a ) NO and ( b ) NO 2 adsorption on the Zn 12 O 12 -based nanowire with isovalues of ±0.008 e/Å 3 .…”
Motivated by the recent realization of cluster-assembled nanomaterials as gas sensors, first-principles calculations are carried out to explore the stability and electronic properties of Zn12O12 cluster-assembled nanowires and the adsorption behaviors of environmental gases on the Zn12O12-based nanowires, including CO, NO, NO2, SO2, NH3, CH4, CO2, O2 and H2. Our results indicate that the ultrathin Zn12O12 cluster-assembled nanowires are particularly thermodynamic stable at room temperature. The CO, NO, NO2, SO2, and NH3 molecules are all chemisorbed on the Zn12O12-based nanowires with reasonable adsorption energies, but CH4, CO2, O2 and H2 molecules are only physically adsorbed on the nanowire. The electronic properties of the Zn12O12-based nanowire present dramatic changes after the adsorption of the NO and NO2 molecules, especially their electric conductivity and magnetic properties, however, the other molecules adsorption hardly change the electric conductivity of the nanowire. Meanwhile, the recovery time of the nanowire sensor at T = 300 K is estimated at 1.5 μs and 16.7 μs for NO and NO2 molecules, respectively. Furthermore, the sensitivities of NO and NO2 are much larger than that of the other molecules. Our results thus conclude that the Zn12O12-based nanowire is a potential candidate for gas sensors with highly sensitivity for NO and NO2.
“…However, the net spin polarization of the Zn 12 O 12 -based nanowire is not modified due to the adsorption of the other considered molecules. In this regard of the change of magnetic properties, the Zn 12 O 12 -based nanowire can be viewed as a highly sensitive gas detection technique based on the measurement of the local magnetic moment in the Zn 12 O 12 -based nanowire using various experimental methods such as AFM or SQUID magnetometry 77 – 79 . Figure 8 Spin density of the most stable configurations of ( a ) NO and ( b ) NO 2 adsorption on the Zn 12 O 12 -based nanowire with isovalues of ±0.008 e/Å 3 .…”
Motivated by the recent realization of cluster-assembled nanomaterials as gas sensors, first-principles calculations are carried out to explore the stability and electronic properties of Zn12O12 cluster-assembled nanowires and the adsorption behaviors of environmental gases on the Zn12O12-based nanowires, including CO, NO, NO2, SO2, NH3, CH4, CO2, O2 and H2. Our results indicate that the ultrathin Zn12O12 cluster-assembled nanowires are particularly thermodynamic stable at room temperature. The CO, NO, NO2, SO2, and NH3 molecules are all chemisorbed on the Zn12O12-based nanowires with reasonable adsorption energies, but CH4, CO2, O2 and H2 molecules are only physically adsorbed on the nanowire. The electronic properties of the Zn12O12-based nanowire present dramatic changes after the adsorption of the NO and NO2 molecules, especially their electric conductivity and magnetic properties, however, the other molecules adsorption hardly change the electric conductivity of the nanowire. Meanwhile, the recovery time of the nanowire sensor at T = 300 K is estimated at 1.5 μs and 16.7 μs for NO and NO2 molecules, respectively. Furthermore, the sensitivities of NO and NO2 are much larger than that of the other molecules. Our results thus conclude that the Zn12O12-based nanowire is a potential candidate for gas sensors with highly sensitivity for NO and NO2.
“…[52][53][54][55][56] That is to say, analyzing the change in magnetic properties of substrates upon interaction with gases could be a new way to detect gases. For example, Matatagui et al 55,56 reported the combination of a magnetostatic surface wave oscillator with a layer of magnetic oxide nanoparticles in what they called a magnonic gas sensor. The perturbation of the magnetic properties of the magnetic oxide layer induces a frequency shi in the magnetostatic surface wave oscillator that can be registered in the presence of different gases.…”
aMotivated by the recent realization of two-dimensional (2D) nanomaterials as gas sensors, we have investigated the adsorption of gas molecules (SO 2 , NO 2 , HCN, NH 3 , H 2 S, CO, NO, O 2 , H 2 , CO 2 , and H 2 O) on the graphitic GaN sheet (PL-GaN) using density functional theory calculations. It is found that among these gases, only SO 2 and NH 3 gas molecules are chemisorbed on the PL-GaN sheet with apparent charge transfer and reasonable adsorption energies. The electronic properties (especially the electric conductivity) of the PL-GaN sheet showed dramatic changes after the adsorption of NH 3 and SO 2 molecules. However, the strong adsorption of SO 2 on the PL-GaN sheet makes desorption difficult, which precludes its application to SO 2 sensors. Therefore, the PL-GaN sheet should be a highly sensitive and selective NH 3 sensor with short recovery time. Furthermore, the adsorption of NO (or NO 2 ) molecules introduces spin polarization in the PL-GaN sheet with a magnetic moment of about 1 m B , indicating that magnetic properties of the PL-GaN sheet are changed obviously. Based on the change of magnetic properties of the PL-GaN sheet before and after molecule adsorption, the PL-GaN sheet could be used as a highly selective magnetic gas sensor for NO and NO 2 detection.
“…than 3, respectively. Conductive iron garnets are promising for other applications such as optical sensors and gas sensors [3][4][5].…”
Section: Introductionmentioning
confidence: 99%
“…4 with desired molar ratios were dissolved completely in deionized water. The obtained aqueous solution was poured into citric acid with the total cations/citric acid molar ratio is 1:1.…”
Abstract:Samples with the compositions Y 2.9 Ca 0.1 Fe 4.9 Sn 0.1 O 12 and Y 3 Fe 4.9 Sn 0.1 O 12 were prepared by using a sol-gel technique. The influence of the substituted non-magnetic cations with different valences in the structural and magnetic properties was studied. X-ray diffraction and fieldemission electron scanning microscope techniques were used to study the crystal structure and morphology. Magnetization curves in fields up to 10 kOe and in temperature range from 80 K to 570 K were measured by means of a vibrating sample magnetometer. Saturation magnetization as a function of temperature of the two samples was analyzed based on the molecular-field theory from that models for site occupancy and valence states of cations in the crystal structures were derived.
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