Hydrothermal synthesis of monodisperse porous cube, cake and spheroid-like α-Fe2O3 particles and their high gas-sensing properties

Jin, Wei; Ma, S.Y.; Tie, Zuoxiu; Jiang, Xiaoxue; Li, W.Q.; Luo, Jing; Xu, Xiaoli; Wang, T.T.

doi:10.1016/j.snb.2015.05.098

Cited by 75 publications

(13 citation statements)

References 61 publications

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“…This may explain the observed irregular spherical and elongated shapes of the final grains. The same remarks have been outlined by several authors [32,33,34], highlighting that α-Fe 2 O 3 powders prepared via the hydrothermal process are composed of particles of 1.5–2.5 μm in diameter because of the agglomeration of smaller nanoparticles.…”

Section: Resultssupporting

confidence: 79%

NO2 Selective Sensor Based on α-Fe2O3 Nanoparticles Synthesized via Hydrothermal Technique

Hjiri

Aida

Neri

2019

Sensors

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In the present work, hematite (α-Fe2O3) nanopowders were successfully prepared via a hydrothermal route. The morphology and microstructure of the synthesized nanopowders were analyzed by using scanning and transmission electron microscopy (SEM and TEM, respectively) analysis and X-ray diffraction. Gas sensing devices were fabricated by printing α-Fe2O3 nanopowders on alumina substrates provided with an interdigitated platinum electrode. To determine the sensor sensitivity toward NO2, one of the main environmental pollutants, tests with low concentrations of NO2 in air were carried out. The results of sensing tests performed at the operating temperature of 200 °C have shown that the α-Fe2O3 sensor exhibits p-type semiconductor behavior and high sensitivity. Further, the dynamics exhibited by the sensor are also very fast. Lastly, to determine the selectivity of the α-Fe2O3 sensor, it was tested toward different gases. The sensor displayed large selectivity to nitrogen dioxide, which can be attributed to larger affinity towards NO2 in comparison to other pollutant gases present in the environment, such as CO and CO2.

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Section: Resultssupporting

confidence: 79%

NO2 Selective Sensor Based on α-Fe2O3 Nanoparticles Synthesized via Hydrothermal Technique

Hjiri

Aida

Neri

2019

Sensors

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“…In two samples, no other possible crystalline phases (such as β‐ FeOOH, FeO, Fe 3 O 4 , or γ‐Fe 2 O 3 ) were detected, indicating the high purity of product. However, the conventional stacking peak (002) of rGO sheets could not be observed in the XRD pattern of FGHF, suggesting that the rGO sheets in the hybrid film maybe highly disordered stacking and was uniformly dispersed in the resultant hybrid matrix . Raman spectra of GO film, rGO film, α‐Fe 2 O 3 powder and FGHF are shown in Figure b.…”

Section: Resultsmentioning

confidence: 99%

2D Layered α‐Fe₂O₃/rGO Flexible Electrode Prepared through Colloidal Electrostatic Self‐Assembly

et al. 2017

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Via simple hydrolysis of FeCl 3 in the boiling water, Fe(OH) 3 colloidal nanoparticles (NPs) exhibit highly positively charged. Graphene oxide (GO) nanosheets show negatively charged when dispersed in water. Inspired by this two fascinating characteristics, 2D layered α-Fe 2 O 3 /rGO hybrid film (FGHF) was fabricated through a facile colloidal electrostatic self-assembly with subsequent vacuum filtration and hydrothermal reduction. In this hybrid film, cubical α-Fe 2 O 3 NPs are well-distributed on rGO sheets, which can provide sufficient active interfacial sites and effectively alleviate the volume variation of α-Fe 2 O 3 NPs during the electrochemical reactions. The as-obtained FGHF exhibits a high specific capacitance of 714 F g -1 and an outstanding rate capability of 42.6% retention at 30 A g -1. Moreover, a flexible supercapacitor was fabricated, which can achieve a high volumetric capacitance of 16.45 F cm -3 , leading to a energy density of 1.46 mWh cm -3 and a power density of 199.8 mW cm -3. The flexible nature of FGHF allows the as-fabricated supercapacitor remained undamaged and almost no change in capacitive performance under bending up to 180 degree.

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“…of its maximum one after the injection of H2S, while the recovery times (trec) is defined as the time at which the response value is decreased to its 10% of its maximum one after the H2S was replaced by air. 38 indicates that the α-Fe2O3 nanocrystals with a rhombohedral crystal structure can be directly prepared using the one-step hydrothermal process in this study. In addition, it can be found from the TEM image (see Fig.…”

Section: Sensor Fabrication and Measurementmentioning

confidence: 94%

Ultrafast Response/Recovery and High Selectivity of the H₂S Gas Sensor Based on α-Fe₂O₃ Nano-Ellipsoids from One-Step Hydrothermal Synthesis

Wu¹,

Li²,

Li³

et al. 2019

ACS Appl. Mater. Interfaces

124

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Ultrafast response/recovery and high selectivity of gas sensors are critical for real-time and online monitoring of hazardous gases. In this work, α-Fe2O3 nano-ellipsoids were synthesized using a facile one-step hydrothermal method and investigated as highly sensitive H2S sensing materials. The nano-ellipsoids have an average long axis diameter of 275 nm and an average short axis diameter of 125 nm. H2S gas sensors fabricated using the α-Fe2O3 nano-ellipsoids showed excellent H2S sensing performance at an optimum working temperature of 260 ℃. The response and recovery times were 0.8 s/2.2 s for H2S gas with a concentration of 50 ppm, which are much faster than those of H2S gas sensors reported in literature. The α-Fe2O3 nano-ellipsoid based sensors also showed a high selectivity to H2S compared to other commonly investigated gases including NH3, CO, NO2, H2, CH2Cl2 and ethanol. In addition, the sensors exhibited high response values to different concentrations of H2S with a detection limit as low as 100 ppb, as well as excellent repeatability and long-term stability.

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Hydrothermal synthesis of monodisperse porous cube, cake and spheroid-like α-Fe2O3 particles and their high gas-sensing properties

Cited by 75 publications

References 61 publications

NO2 Selective Sensor Based on α-Fe2O3 Nanoparticles Synthesized via Hydrothermal Technique

NO2 Selective Sensor Based on α-Fe2O3 Nanoparticles Synthesized via Hydrothermal Technique

2D Layered α‐Fe₂O₃/rGO Flexible Electrode Prepared through Colloidal Electrostatic Self‐Assembly

Ultrafast Response/Recovery and High Selectivity of the H₂S Gas Sensor Based on α-Fe₂O₃ Nano-Ellipsoids from One-Step Hydrothermal Synthesis

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Hydrothermal synthesis of monodisperse porous cube, cake and spheroid-like α-Fe2O3 particles and their high gas-sensing properties

Cited by 75 publications

References 61 publications

NO2 Selective Sensor Based on α-Fe2O3 Nanoparticles Synthesized via Hydrothermal Technique

NO2 Selective Sensor Based on α-Fe2O3 Nanoparticles Synthesized via Hydrothermal Technique

2D Layered α‐Fe2O3/rGO Flexible Electrode Prepared through Colloidal Electrostatic Self‐Assembly

Ultrafast Response/Recovery and High Selectivity of the H2S Gas Sensor Based on α-Fe2O3 Nano-Ellipsoids from One-Step Hydrothermal Synthesis

Contact Info

Product

Resources

About

2D Layered α‐Fe₂O₃/rGO Flexible Electrode Prepared through Colloidal Electrostatic Self‐Assembly

Ultrafast Response/Recovery and High Selectivity of the H₂S Gas Sensor Based on α-Fe₂O₃ Nano-Ellipsoids from One-Step Hydrothermal Synthesis