low-temperature h2s sensors based on ag-doped fe2o3 nanoparticles
low-temperature h2s sensors based on ag-doped fe2o3 nanoparticles
... online at www.sciencedirect.com Sensors and Actuators B 131 (2008) 183–189 Low-temperature H 2 S sensors based on Ag-doped ␣-Fe 2 O 3 nanoparticles Yan Wang, Yanmei Wang, Jianliang Cao, Fanhong ... generally mentioned earlier, the gas-sensing mechanism of ␣-Fe 2 O 3 -based sensors belongs to the surface-controlled type, which is based on the change in conductance of the...
Ngày tải lên: 20/03/2014, 13:04
h2s sensors based on tungsten oxide nanostructures
... X-ray diffraction (Cu K␣ radiation), scanning electron microscopy (SEM, LEICA S440i), field emission scan- ning electron microscopy (FESEM with a NOVA NANOSEM 600), transmission electron microscopy ... highest response found is 757 at 250 ◦ C, and 29 at 40 ◦ C. The variation in response of the WO 3 nanoparticles with the concentration (1–1000 ppm) of H 2 Sat250 ◦ C is shown in Fig. 4b. The...
Ngày tải lên: 19/03/2014, 16:48
semiconductor gas sensors based on nanostructured tungsten oxide
... vaporization of metal tungsten in a reactive atmosphere was used to produce UFP powder of WO for screen printing. 3 A drawback of the conventional semiconductor gas sensors is their operation at ... near- equilibrium conditions with only a weak tendency to- wards agglomeration. The growth can be determined by first-passage-time dynamics in the vapor zone and the wx size distribution is narro...
Ngày tải lên: 20/03/2014, 13:07
xps studies of active elements surface of gas sensors based on wo3nanoparticles
... work conditions important is the exploration of the state of sensor’s surface after long contact with air at room temperature and influence of short-time anneal. We synthesized nanodisperse nonstoichiometric ... explo- sion of wires (EEW) at different proportions between argon and oxygen. Synthesis of nanoparticles by EEW-method [12,13] belongs to high-energy methods of synthesis and allows...
Ngày tải lên: 20/03/2014, 13:12
Báo cáo khoa học: Piezoelectric sensors based on molecular imprinted polymers for detection of low molecular mass analytes potx
... Polymerization format Monomer selection Medium selection Polymerization conditions Covalent Bulk polymerization Combinatorial screening Organic solvent Cross-linking agent selection Noncovalent ... [17,53–55]. Application areas of MIP–QCM biosensors The three most common application areas for MIP– QCM sensors are clinical diagnosis, environmental monitoring and control of enantiomeric separ...
Ngày tải lên: 23/03/2014, 07:20
a selective nh3 gas sensor based on fe2o3–zno nanocomposites at room temperature
... response time and recovery time, it can be concluded that Fe:Zn = 2% is the best composition. Fig. 6. Response of gas sensors based on the Fe 2 O 3 –ZnO nanocomposites with different compositions ... sensor based on 2% Fe 2 O 3 –ZnO nanoparticle. 3.5. Reproducibility of gas sensor based on 2% Fe 2 O 3 –ZnO nanoparticles Fig. 7 shows the reproducibility of the sensor based o...
Ngày tải lên: 19/03/2014, 16:47
Báo cáo y học: "Gain of a 500-fold sensitivity on an intravital MR Contrast Agent based on an endohedral Gadolinium-Cluster-Fullerene-Conjugate: A new chance in cancer diagnostics"
... Gd concentrations. This modularly designed contrast agent represents a new tool for improved monitoring and evaluation of interventions at the gene transcription level. Also, a widespread monitoring ... Ligation reaction based on the Diels Alder Reaction with invers electron demand. [EP 06 012 414.6]. 6-10-2006. 46. Reppe W, Schlichting O, Klager K, et al. Cyclisierende Polymerisati...
Ngày tải lên: 26/10/2012, 09:07
Metaphor, based on the association of similarity, is one of the two basic types of semantic transference that have been an interest for many linguistic researchers
... definitions and 9 skeptical An investigation into the role of metaphor in description of emotion in poetic discourse 17 statements about the concept of emotion concluding that there is little consistency ... interactive functions: statements are expressions which give An investigation into the role of metaphor in description of emotion in poetic discourse 23 information, questions are expre...
Ngày tải lên: 07/11/2012, 14:44
Consolidation Chareteristics based on a direct analytical solution of the Terzaghi Theory
... of consolidation at 50% consolidation; this method requires the determination of the initial and final compressions corresponding to 0 and 100% consolidation, respectively. The determination ... realistic determination of the coefficient of consolidation (Olson, 1986; Robinson, 1999). SUMMARY AND CONCLUSIONS In the present study, a new method is developed for Consolidation Charact...
Ngày tải lên: 21/03/2013, 14:09