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DeviSim NAP

DeviSim NAP Reactor Cell at Near Ambient Pressure Conditions for Direct Coupling to PHOIBOS 150 NAP

DeviSim NAP is a reactor cell of 400 ml volume at near ambient pressure conditions that can directly be coupled to the PHOIBOS 150 NAP. It is built on a manipulator which is docked into the UHV analysis chamber with PHOIBOS 150 NAP analyzer. It designed for a fast sample transfer. The cell includes a gas inlet system suitable for a wide range of gases. The sample heating mechanism allows for heating up to 600 °C at 20 mbar of N2 pressure and cooling with liquid Nitrogen down to at least 200 K and a gas handling system.

The XPS-NAP coupling will permits to  acquire XPS spectra at pressures up to 25 mbar at a high signal/noise ratio. The DeviSim NAP allows near ambient pressure XPS measurements at pressures ≥30 mbar for N2.

Offered in-situ near ambient pressure NAP cell is fully compatible with the existing NAP XPS instruments provided by SPECS.The compatibility includes mechanical attachment interfaces including connection to the differentially pumped hemispherical analyzer, electrical connections and interlocking, UHV and elevated pressure control and control software, and minimal mutual disturbance in operation.

KEY FEATURES

  • Powerful and easy to use in systems for studies under near ambient pressure conditions
  • Combination with high performance PHOIBOS 150 NAP electron analyzer
  • Designed for perfect control of the sample environment
  • Optional IR laser heating in gaseous environments
  • Optional Peltier cooling in gaseous environments
  • Customizable gas handling systems

MADE FOR THESE METHODS

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camera holder

PUBLICATIONS

  1. (2019) <p>New Insight into the Gas-Sensing Properties of CuOx Nanowires by Near-Ambient Pressure XPS</p>

    This article presents an investigation of the sensing properties of chemiresistors based on Cu2O/CuO core–shell nanowires containing p–p′ heterojunctions. The nanowires were synthesized by a conventional hydrothermal method and used for the detection of ethanol and nitrogen dioxide, reducing and oxidizing agents, respectively. To unravel the chemical processes connected with gas detection, an in situ approach was applied. This approach was based on near-ambient pressure X-ray photoelectron spectroscopy combined with simultaneous monitoring of sensor responses. The in situ measurements were performed during exposure to the analytes at a total pressure of 0.05–1.05 mbar and 450 K and were correlated with chemiresistor response measurements carried out at a standard pressure and under an ambient atmosphere. The study revealed that heterojunction treatment with ethanol vapors, accompanied by partial reduction of the nanowires, is the key step to obtaining chemiresistors with good sensing performance. While the untreated heterojunctions exhibited poor n-type sensing responses, the treated ones showed significantly improved p-type responses. The treated sensors were characterized by a stable baseline, high reversibility, detection limits estimated as 50 ppm for ethanol and 100 ppb for nitrogen dioxide, and with response times in tens of seconds. In all cases, we propose a band scheme of Cu2O/CuO heterojunctions and a gas-sensing mechanism.
     



    P. Hozák, M. Vorokhta, I. Khalakhan, K. Jarkovská, K. Jarkovská
    J. Cibulková, P. Fitl, J. Vlček, J. Fara, D. Tomeček, M. Novotný, M. Vorokhta, J. Lančok, I. Matolínová, and M. Vrňata
    J. Phys. Chem. C 2019, 123, 49, 29739–29749
    Read more
  2. (2018) <p>Electrifying model catalysts for understanding electrocatalytic reactions in liquid electrolytes</p>

    Electrocatalysis is at the heart of our future transition to a renewable energy system. Most energy storage and conversion technologies for renewables rely on electrocatalytic processes and, with increasing availability of cheap electrical energy from renewables, chemical production will witness electrification in the near future1,2,3. However, our fundamental understanding of electrocatalysis lags behind the field of classical heterogeneous catalysis that has been the dominating chemical technology for a long time. Here, we describe a new strategy to advance fundamental studies on electrocatalytic materials. We propose to ‘electrify’ complex oxide-based model catalysts made by surface science methods to explore electrocatalytic reactions in liquid electrolytes. We demonstrate the feasibility of this concept by transferring an atomically defined platinum/cobalt oxide model catalyst into the electrochemical environment while preserving its atomic surface structure. Using this approach, we explore particle size effects and identify hitherto unknown metal–support interactions that stabilize oxidized platinum at the nanoparticle interface. The metal–support interactions open a new synergistic reaction pathway that involves both metallic and oxidized platinum. Our results illustrate the potential of the concept, which makes available a systematic approach to build atomically defined model electrodes for fundamental electrocatalytic studies.



    F. Faisal, C.Stumm, M. Bertram, F. Waidhas, Y. Lykhach, S.Cherevko, F. Xiang, M. Ammon,
    M. Vorokhta, B. Šmíd, T. Skála, N. Tsud, A. Neitzel, K. Beranová, K. C. Prince, S. Geiger,
    O. Kasian, T. Wähler, R. Schuster, M. A. Schneider, V. Matolín, K. J. J.
    Nature Materials volume 17, pages 592–598 (2018)
    Read more
  3. (2018) <p>Investigation of gas sensing mechanism of SnO2 based chemiresistor using near ambient pressure XPS</p>

    In this article, we present the results of an investigation into chemical processes which take place at the surface of SnO2-based chemiresistor in various atmospheres (1 mbar of argon, 1 mbar of oxygen, 0.1 mbar of ethanol, 1 mbar of oxygen + 0.1 mbar of ethanol mixture) at common working temperatures (450 and 573 K). The key method for nanoscale analysis was the Near Ambient Pressure X-ray Photoelectron Spectroscopy. In parallel the resistance and DC-responses of SnO2 layer were in-situ monitored providing information about macroscale processes during gas sensing. The change in the sensor resistance after exposure to the ethanol-containing atmospheres together with the disappearance of the band bending effect and observation of different carbonaceous groups including ethoxy groups and acetaldehyde molecules on the sensor surface in the XPS spectra supported the theory of chemical interaction of ethanol with the chemisorbed oxygen. The NAP-XPS spectra also showed that the nanostructured tin oxide is partially reduced even after being exposed to pure oxygen at 573 K. Exposing this surface to the mixture of O2/EtOH did not significantly increase the surface reduction probably due to slow kinetics of the ethanol reduction process and fast kinetics of the oxygen re-oxidation process. However, it was demonstrated that the surface of sensor is slowly getting contaminated by carbon.



    M. Vorokhta, I. Khalakhan, M. Vondráček, D. Tomeček, M. Vorokhta, E. Marešová, J. Nováková, J. Vlček, P. Fitl, M. Novotný, P. Hozák, J. Lančok, M. Vrňata, I. Matolínová, and V. Matolín
    Surface Science, Volume 677, November 2018, Pages 284-290
    Read more

SPARE PARTS

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Product image
Product description
Article No.
 
Borosilicate Glass, 14 mm diameter, thickness 1,1 mm

Replacment window for DeviSIM NAP cell view ports. 14 mm diameter

2055021887
Filament for DeviSIM Manipulator R2

Replacement filament for DeviSIM NAP cell e-beam heating

2055025676
O-Ring 11 x 1 Vi 500

Replacement O-Ring for DeviSIM NAP cell view port. 14 mm diameter. 2 pieces needed

2060006209
O-Ring 12 x 1 Vi500

Replacement O-Ring for DeviSIM NAP cell view port for XR-MF-window 16 x 10 mm. 2 pieces needed.

2060008667
O-Ring 14 x 1,5 Vi 370

Replacement O-Ring for DeviSIM NAP cell view port for XR-50-window 19 x 19 mm. 2 pieces needed

2060011346
Silicium Nitride window 16 x 10 mm,Al coated (100 nm)

Replacment SiNi window for DeviSIM NAP cell XR-MF port. 16 x 10 mm. Aluminum coated (100 nm)

2055012609
Silicon nitride membrane window 19 x 19 mm

Replacment SiNi window for DeviSIM NAP cell XR-50 port. 19 x 19 mm

2055013283
Skimmer 11,00 mm Opening-Diameter 0,3 mm(gold coated)

Replacement nozzle for 300 µm for DeviSIM NAP cell. 25 mbar. Other opening dimensions on request available.

2060007970
UVS window special for NAP, B=18, L=8, H=4

Replacement UVS window for DeviSIM NAP cell UVS300 with ETC capillary

2100004663

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