Preparation and characterization Co3O4 nanoparticles on porous silicon for humidity sensor by photoluminescence

Abid, Huda N.; Nayef, Uday M.; Mutlak, Falah A.-H.

doi:10.1016/j.ijleo.2018.09.167

Cited by 43 publications

(7 citation statements)

References 10 publications

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“…For the Co 3 O 4 sample, the diffraction peaks at 19.1, 31.3, 36.9, 44.7, 59.4, and 65.4° can be indexed to the (111), (220), (311), (400), (511) and (440) planes of cubic Co 3 O 4 (JCPDS, No. 42-1467), respectively . For the In 2 O 3 sample, the five diffraction peaks at 2θ = 21.4, 30.5, 35.4, 51.1, and 60.7° correspond to the (211), (222), (400), (440), and (622) crystallographic planes of cubic In 2 O 3 (JCPDS, No.…”

Section: Results and Discussionmentioning

confidence: 99%

Hydrothermal Microwave Synthesis of Co₃O₄/In₂O₃ Nanostructures for Photoelectrocatalytic Reduction of Cr(VI)

Nan

Guo

Alhashmialameer

et al. 2022

ACS Appl. Nano Mater.

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Co3O4/In2O3 nanocomposites were prepared via a microwave-hydrothermal method and directly used as photoanodes for the photoelectrocatalytic (PEC) process to reduce Cr(VI). The as-prepared Co3O4/In2O3 composites show a rod-like structure, which is composed of nanoparticles. The PEC experiments indicated that after 120 min of irradiation with 0.7 V bias voltage and visible light, the Cr(VI) reduction efficiency of Co3O4/In2O3 composites in aqueous solution was 100%, which was superior to the samples prepared by other methods. Moreover, the Co3O4/In2O3 composite still had a high catalytic activity after five runs of PEC experiments. Elimination experiments demonstrate that photo-generated electrons (e–) performed a key role in the catalytic reduction of Cr(VI). The significantly improved PEC performance can be attributed to the bias voltage and the p-n heterojunction formed between Co3O4 and In2O3. Therefore, Co3O4/In2O3 nanocomposites have a considerable potential for the PEC reduction of Cr(VI).

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Section: Results and Discussionmentioning

confidence: 99%

Hydrothermal Microwave Synthesis of Co₃O₄/In₂O₃ Nanostructures for Photoelectrocatalytic Reduction of Cr(VI)

Nan

Guo

Alhashmialameer

et al. 2022

ACS Appl. Nano Mater.

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“…The densification of the surface and internal microstructure rapidly progressed with an increase in thickness because NaCl/BaTiO 3 particles continuously accumulated on the pre-deposited layer. However, a humidity sensor requires a porous structure to allow moisture to effectively permeate into the inner film, which means that high densification due to increased thickness has a negative effect [ 52 , 53 , 54 , 55 ]. This indicates that the amount of NaCl embedded in the composite film proportionally increases with layer thickness, and this can lead to a higher sensitivity due to substantial NaCl ionization-based interfacial polarization.…”

Section: Resultsmentioning

confidence: 99%

NaCl Ionization-Based Moisture Sensor Prepared by Aerosol Deposition for Monitoring Respiratory Patterns

Cho

Kim

et al. 2022

Sensors

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A highly polarizable moisture sensor with multimodal sensing capabilities has great advantages for healthcare applications such as human respiration monitoring. We introduce an ionically polarizable moisture sensor based on NaCl/BaTiO3 composite films fabricated using a facile aerosol deposition (AD) process. The proposed sensing model operates based on an enormous NaCl ionization effect in addition to natural moisture polarization, whereas all previous sensors are based only on the latter. We obtained an optimal sensing performance in a 0.5 µm-thick layer containing NaCl-37.5 wt% by manipulating the sensing layer thickness and weight fraction of NaCl. The NaCl/BaTiO3 sensing layer exhibits outstanding sensitivity over a wide humidity range and a fast response/recovery time of 2/2 s; these results were obtained by performing the one-step AD process at room temperature without using any auxiliary methods. Further, we present a human respiration monitoring system using a sensing device that provides favorable and stable electrical signals under diverse respiratory scenarios.

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“…In another report, the existence of Co 4+ /Co 3+ ion couple is regard as major reason of excellent catalytic activity of Co3O4. [4,5,6] In summary, high-valance species of cobalt is much concern with the catalytic activeness to ammonia oxidization and is regard as the critical component in the catalyst. But the fundamental principle of the high catalytic activeness of the high-valence state cobalt to ammonia oxidization is still obscure.…”

Section: Introductionmentioning

confidence: 99%

“…The problems are raised when using Co3O4 as anode catalyst in gas diffusion electrode (GDE). First, most of the synthetic routes of Co3O4 involve a high temperature calcinations step at about 300 • C [5,7], which limit the using of some important organic materials such as polymers and paraffin in GDE. Second, the poor electric conductivity of Co3O4 at room temperature (about 10 4 Ω/cm) made it unsuitable for its application as high effective electrode material [6,8].…”

Section: Introductionmentioning

confidence: 99%

Scale like Co(OH)2/CoOOH modified platinum catalytic gas diffusion electrode and its application in ammonia detection

Dong

Wu²

2022

J. Phys.: Conf. Ser.

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Platinum (Pt) is sputtered on porous PTFE membrane as the basic electrode. Cobalt hydroxide catalyst is deposited on the porous platinum/PTFE electrode by an electrochemical assisted deposition method with ammonia gas employed as precipitant. SEM image of the catalyst shows an integration of scale like flake of about 0.5 micrometer in diameter. The XRD analysis suggested that the catalyst is a mixture of β-Co(OH)2 and CoOOH. The mixture is regard as the effective constituent in the ammonia electrode reaction according to the electrochemical analysis. The cyclic voltammogram indicate that at higher than 0.4V (v.s. saturated HgO/Hg electrode reference) the catalytic activity of the working electrode increased significantly. With the modified electrode as working electrode and a pure platinum electrode as assistant electrode, a four electrodes sensor is established to measure ammonia in air successfully.

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Preparation and characterization Co3O4 nanoparticles on porous silicon for humidity sensor by photoluminescence

Cited by 43 publications

References 10 publications

Hydrothermal Microwave Synthesis of Co₃O₄/In₂O₃ Nanostructures for Photoelectrocatalytic Reduction of Cr(VI)

Hydrothermal Microwave Synthesis of Co₃O₄/In₂O₃ Nanostructures for Photoelectrocatalytic Reduction of Cr(VI)

NaCl Ionization-Based Moisture Sensor Prepared by Aerosol Deposition for Monitoring Respiratory Patterns

Scale like Co(OH)2/CoOOH modified platinum catalytic gas diffusion electrode and its application in ammonia detection

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Preparation and characterization Co3O4 nanoparticles on porous silicon for humidity sensor by photoluminescence

Cited by 43 publications

References 10 publications

Hydrothermal Microwave Synthesis of Co3O4/In2O3 Nanostructures for Photoelectrocatalytic Reduction of Cr(VI)

Hydrothermal Microwave Synthesis of Co3O4/In2O3 Nanostructures for Photoelectrocatalytic Reduction of Cr(VI)

NaCl Ionization-Based Moisture Sensor Prepared by Aerosol Deposition for Monitoring Respiratory Patterns

Scale like Co(OH)2/CoOOH modified platinum catalytic gas diffusion electrode and its application in ammonia detection

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Hydrothermal Microwave Synthesis of Co₃O₄/In₂O₃ Nanostructures for Photoelectrocatalytic Reduction of Cr(VI)

Hydrothermal Microwave Synthesis of Co₃O₄/In₂O₃ Nanostructures for Photoelectrocatalytic Reduction of Cr(VI)