Pt modified carbon nanotube networked layers for enhanced gas microsensors

... selectivity when they are used just for Zn(II) detection On the other hand, the fluorescence enhancement of MWNTs-GNQ is only for Zn(II) As the use of organic–inorganic hybrid materials for bio-application ... with the FTIR spectrum of GNQ, the characteristic peaks of amino groups in the spectrum of MWNTs-GNQ disappeared, demonstrating that the amino groups on G...

Ngày tải lên: 22/06/2014, 01:20

... V1.6.1 [14] M L S Penaloza, G Baudoin, and M Villegas, “Analysis of a modified polar sigma-delta transmitter architecture for multiradio applications,” in Proceedings of the 18th International Conference ... Architecture of a polar ΣΔ transmitter with RF recombination [6] ρ Digital ΣΔ φ(t) Digital DAC x(t) PLL φ (t) PA cos (wc t + φ (t)) Figure 3: Architecture of the modified...

Ngày tải lên: 21/06/2014, 11:20

... detectable cell numbers of about 104 in vitro Magnetic fluorescent nanoparticles serve both as magnetic resonance contrast agents for MRI and optical probes for intravital fluorescence microscopy Cytotoxicity ... the FITC-CS@MNPs had high cellular affinity and low detection threshold of cell number In order to clarify the location of the magnetic nanoparticles in the cells, we pe...

Ngày tải lên: 22/06/2014, 01:20

... Suitable for all sizes of power stations, kW to multi-MW Table 1. 1 Main types of fuel cells and their characteristics and applications   1. 3 Proton Exchange Membrane Fuel Cells (PEMFCs) Proton Exchange ... 1- 1 to 1- 3 [2]: Anode: H2 2H+ + 2e- Cathode: 2H+ + 2e- + 1/ 2O2 Overall: H2 + 1/ 2O2 (1- 1) H2O H2O + electricity + heat (1- 2) (1- 3) According to Eq 1- 3, t...

Ngày tải lên: 11/09/2015, 10:02

... most accurate and realistic information of the Pt/CNT -based electrocatalyst as a potential substitute for conventional Pt/VXC72Rbased electrocatalysts used for high- efficiency PEMFC applications ... VCXC72R Carbon paper TGPH090 Toray Carbon black (CB) VCXC72R Cabot Commercial Pt catalyst 40wt% Pt/VCXC72R Johnson Matthey Commercial Pt catalyst 20 wt% Pt/VCXC72R E-TEK Nafion m...

Ngày tải lên: 11/09/2015, 10:03

... (6vol%) and silane (1vol%) solution containing 0 .3 M Ni(NO3)2 and 0 .3 M Co(NO3)2 for h During the CNT growth, the carbon paper was heated at 600 °C for at 35 0 sccm Ar and 1.5 sccm H2 flow to obtain ... well as the carbon graphitization (see Fig 3. 2 (a)) On the other hand, at a high growth temperature of 800 °C, thermal pyrolysis of C2H4 would take place to form amorphous ca...

Ngày tải lên: 11/09/2015, 10:03

... studies [13-17] 20000 4f7/2, 71.1 eV 4f5/2, 74. 4 eV 16000 CPS 12000 8000 40 00 84 82 80 78 76 74 72 70 68 66 64 Binding energy / eV Fig 4. 4 XPS spectrum of Pt nanoparticles on CNT /carbon paper by sputter-deposition ... sccm C2H4) 0.8 Pt/CNT -based cathode (15 sccm C2H4) Cell potential / V Pt/CNT -based cathode (20 sccm C2H4) Pt/CNT -based cathode (25 sccm C2H4) 0.6 -2 Pt loading:...

Ngày tải lên: 11/09/2015, 10:03

... The longterm stability information of Pt/CNT -based electrocatalysts from a fuel cell under real operating conditions would be very useful for the full evaluation of these electrocatalysts in terms ... wt% Pt/VXC72Rbased electrodes at 1 .5 V vs DHE   141    120 (a) Before potentiostatic oxidation After 30min oxidation at 1.5V After 60min oxidation at 1.5V After 90min oxidation at 1.5V A...

Ngày tải lên: 11/09/2015, 10:03

... cm-1 This technique is thus more suitable for fabricating low Pt loading electrode with high Pt utilization for PEMFC applications 6. 2 Recommendations for Future Research The in situ grown CNT ... tests were performed in a single cell test system When compared with two commercial Pt/VXC72R -based electrodes, the Pt/CNT -based electrode showed a notable improvement in polarization...

Ngày tải lên: 11/09/2015, 10:03

... doi:10.1186/1556-276X-7-74 Cite this article as: Park et al.: Hafnium metallocene compounds used as cathode interfacial layers for enhanced electron transfer in organic solar cells Nanoscale Research Letters ... coordinated in a sandwich structure was used as a cathode interfacial layer in OSCs In this study, we demonstrated that ECHD can be util...

Ngày tải lên: 21/06/2014, 17:20

... more electroconductive The CNT paper sample switched from n- to p-type carrier upon deposition of the Pt, indicating that electron conduction changed to hole conduction upon deposition of the Pt ... the contact time Hall measurements showed that CNT paper and CNT paper modified with Pt had excellent electrical conductivity The sheet resistivity increased slightly when the CNT pa...

Ngày tải lên: 22/06/2014, 00:20

... Chunk-lattices for verb reordering in ArabicEnglish statistical machine translation Machine Translation, Published Online David Chiang 2005 A hierarchical phrase-based model for statistical machine ... testing for statistical machine translation: Controlling for optimizer instability In Proceedings of the Association for Computational Lingustics, ACL 2011, Portland,...

Ngày tải lên: 19/02/2014, 19:20

... nested PCR principle can easily produce 3¢- end cDNA tag-specific frag- Methods for 3¢ end amplification from SAGE tags ments from the SAGE tags (see the protocol in Scheme in the Appendix for more ... (1999) Serial analysis of gene expression: rapid RT -PCR analysis of unknown SAGE tags Nucleic Acids Res 27, e17 34 Chen JJ, Rowley JD & Wang SM (2000) Ge...

Ngày tải lên: 07/03/2014, 00:20

... typically 5% of the mean diameter ͓Fig 3͑a͒, Li et al FIG Highly- ordered carbon nanotube arrays ͑a͒ SEM image showing oblique view of periodic carbon nanotube array The inset at the lower left is an enlarged ... inexpensive production of large arrays of ordered carbon nanotubes with controllable dimensions needed for practical applications The physical mechanism of ca...

Ngày tải lên: 19/03/2014, 16:48

... surface of metal oxide grains and at the interface of metal oxide grains and MWCNTs, respectively is postulated as the mechanism that could explain the enhanced performance of hybrid metal oxide/ MWCNT ... NO2 Therefore, sensor responsiveness heavily depends on the amount of MWCNTs dispersed on the metal oxide matrix Sensors based on TiO2 and carbon nanotubes (samples...

Ngày tải lên: 19/03/2014, 16:48