A low cost optical hydrogen sensing device using nanocrystalline Pd grating

Gupta, Ritu; Sagade, Abhay A.

doi:10.1016/j.ijhydene.2012.03.010

Cited by 29 publications

(26 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The absorption process is accompanied by several changes to the physical properties of Pd, including the aforementioned lattice expansion of up to several percent and an increase in resistivity as high as 80% for PdH0.7 at 25 °C [45]. Pd is also quite selective regarding hydrogen absorption and exhibits low sensitivity to other gases, such as CO, Cl2, SO2, H2S, NOx, and hydrocarbons, making it a suitable material in hydrogen sensors [46]. The challenge to reach the application stage lies in how to most effectively sense these hydrogen-induced changes to Pd.…”

Section: Hydrogen In Co/pd Filmsmentioning

confidence: 99%

Hydrogen Absorption in Metal Thin Films and Heterostructures Investigated in Situ with Neutron and X-ray Scattering

Callori

Rehm

Causer

et al. 2016

Metals

View full text Add to dashboard Cite

Due to hydrogen possessing a relatively large neutron scattering length, hydrogen absorption and desorption behaviors in metal thin films can straightforwardly be investigated by neutron reflectometry. However, to further elucidate the chemical structure of the hydrogen absorbing materials, complementary techniques such as high resolution X-ray reflectometry and diffraction remain important too. Examples of work on such systems include Nb-and Pd-based multilayers, where Nb and Pd both have strong affinity to hydrogen. W/Nb and Fe/Nb multilayers were measured in situ with unpolarized and polarized neutron reflectometry under hydrogen gas charging conditions. The gas-pressure/hydrogen-concentration dependence, the hydrogen-induced macroscopic film swelling as well as the increase in crystal lattice plane distances of the films were determined. Ferromagnetic-Co/Pd multilayers were studied with polarized neutron reflectometry and in situ ferromagnetic resonance measurements to understand the effect of hydrogen absorption on the magnetic properties of the system. This electronic effect enables a novel approach for hydrogen sensing using a magnetic readout scheme.

show abstract

Section: Hydrogen In Co/pd Filmsmentioning

confidence: 99%

Hydrogen Absorption in Metal Thin Films and Heterostructures Investigated in Situ with Neutron and X-ray Scattering

Callori

Rehm

Causer

et al. 2016

Metals

View full text Add to dashboard Cite

show abstract

“…The Ni‐HDT complex in toluene is deep black‐brown due to ligand‐to‐metal charge‐transfer transitions. A thiol group with a long methylene chain (hexadecanethiol) was chosen for this study to achieve high solubility in organic solvent for solution processing . Nickel alkanethiolates, Ni(SR) 2 , are known to form lamellar bilayers (Figure a, right) .…”

Section: Resultsmentioning

confidence: 99%

“…TheN i-HDT complex in toluenei s deep black-brown due to ligand-to-metal charge-transfer transitions.Athiolg roup with al ong methylenec hain (hexadecanethiol) was chosen for this study to achieve high solubility in organics olvent for solution processing. [29,30] Nickel alkanethiolates,N i(SR) 2 ,are known to form lamellar bilayers (Figure 1a,r ight). [28] TheX RD pattern of pristine Ni-HDT in Figure 1bincludes ab road peak at 2q = 4.6128 corresponding to the (001) reflectionw ith ac orresponding d spacing of 9.63 .T he partialt hermolysiso fN i-HDT at 200 8Cr esults in ab road band without sharp or crystalline peaks,w hich is indicative of the formation of small nucleates surrounded by material of amorphous nature.…”

Section: Resultsmentioning

confidence: 99%

Scalable Coating of Single‐Source Nickel Hexadecanethiolate Precursor on 3D Graphitic Petals for Asymmetric Supercapacitors

Gupta

Fisher

2016

Energy Tech

Self Cite

View full text Add to dashboard Cite

A hybrid Ni‐based pseudocapacitive coating consisting of NiO–Ni3S4 on graphene petals is studied as an efficient electrode for supercapacitor applications. A single‐source precursor of Ni is synthesized for coating on graphene petals supported on conducting carbon cloth as the current collector. The loading of Ni hexadecanethiolate on graphene petals surface is optimized with respect to electrochemical performance in terms of specific capacitance. The hybrid electrode gives high specific capacitance (≈2360 F g−1) and stability over 5000 cycles. Importantly, this coating process of Ni‐based pseudocapacitive layer can be readily deployed in roll‐to‐roll (R2R) processes.

show abstract

“…Among them, optical methods such as fiber-optic gas sensors have the advantages of being explosion-proof and immune to electromagnetic noise. (6) Most optical sensors are based on changes in the optical properties of chemochromic materials such as palladium, (7) metal oxides, (8,9) metal hydrides, (10) and magnesium-containing alloys.…”

Section: Introductionmentioning

confidence: 99%

Optimization of Hydrogen Sensing Performance of Pt/WO3 Gasochromic Film Fabricated by the Sol–Gel Method

2017

Sensors and Materials

View full text Add to dashboard Cite

The sensing performance of a sol-gel-derived Pt/WO 3 film used in an optical hydrogen gas sensor was evaluated and optimized. The Pt/WO 3 film was deposited on a quartz glass substrate by the sol-gel method based on the acidification of Na 2 WO 3 aqueous solutions. Optical transmittance changes of the films as a result of exposure to hydrogen-containing gas were measured in the near-infrared region. The sensor performance was severely affected by fabrication parameters such as annealing conditions, precursor concentration, and catalyst loading. In the case of annealing at 500 °C, high sensitivity and fast response were obtained. An annealing time of at least 0.5 h was required to attain stable performance, and long annealing times had no effect on the sensitivity. However, the sensor performance and transparency of the film became poorer in the case of a ratio of over 0.4. The atomic ratio of Pt to W showed a considerable effect on the sensing characteristics. Both the sensitivity and response kinetics were promoted with increasing Pt loading. When the ratio was about 0.35, maximum sensitivity was observed. The concentration of the Na 2 WO 4 solution used in the sol-gel process was also an important parameter. The sensitivity increased with increasing concentration since the thickness of the sensing film increased. The dependence of response speed on concentration was larger than that of recovery speed. When the film was exposed to H 2 /N 2 gas, good response was observed; the hydrogen detection limit was about 0.001 vol% and minimal influence of water vapor was noted. The sensing performance, however, became poorer because oxygen inhibited the reaction when the film was exposed to hydrogen-containing air.

show abstract

A low cost optical hydrogen sensing device using nanocrystalline Pd grating

Cited by 29 publications

References 39 publications

Hydrogen Absorption in Metal Thin Films and Heterostructures Investigated in Situ with Neutron and X-ray Scattering

Hydrogen Absorption in Metal Thin Films and Heterostructures Investigated in Situ with Neutron and X-ray Scattering

Scalable Coating of Single‐Source Nickel Hexadecanethiolate Precursor on 3D Graphitic Petals for Asymmetric Supercapacitors

Optimization of Hydrogen Sensing Performance of Pt/WO3 Gasochromic Film Fabricated by the Sol–Gel Method

Contact Info

Product

Resources

About

A low cost optical hydrogen sensing device using nanocrystalline Pd grating

Cited by 29 publications

References 39 publications

Hydrogen Absorption in Metal Thin Films and Heterostructures Investigated in Situ with Neutron and X-ray Scattering

Hydrogen Absorption in Metal Thin Films and Heterostructures Investigated in Situ with Neutron and X-ray Scattering

Scalable Coating of Single‐Source Nickel Hexadecanethiolate Precursor on 3D Graphitic Petals for Asymmetric Supercapacitors

Optimization of Hydrogen Sensing Performance of Pt/WO3 Gasochromic Film Fabricated by the Sol&ndash;Gel Method

Contact Info

Product

Resources

About

Optimization of Hydrogen Sensing Performance of Pt/WO3 Gasochromic Film Fabricated by the Sol–Gel Method