Influence of the air humidity on the electrical conductivity of the β-Ga2O3-GaS structure: air humidity sensor

Sprincean, Veaceslav; Caraman, Mihail; Spataru, Tudor; Fernandez, Francisco; Paladi, Florentin

doi:10.1007/s00339-022-05402-6

Cited by 8 publications

(8 citation statements)

References 22 publications

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“…For the growth of Ga 2 O 3 -sensing material, liquid gallium [ 106 , 107 , 108 , 109 , 110 , 111 , 112 , 113 , 114 , 115 , 116 , 117 , 118 , 119 , 120 , 121 , 122 , 123 ], gallium nitride [ 124 , 125 , 126 , 127 , 128 , 129 , 130 , 131 , 132 ], gallium sulfides, including Ga 2 S 3 [ 133 ] and GaS [ 134 ], gallium acetylacetonate [ 135 ], and gallium chloride [ 65 , 66 , 136 , 137 , 138 ] are often used as the gallium source, while pure oxygen or water vapor is selected as the oxygen source. Argon or nitrogen is used as the carrier gas.…”

Section: Preparation Methods Of Ga 2 O 3...mentioning

confidence: 99%

“…The morphology of these Ga 2 O 3 functional nanomaterials varies from one dimensional to three-dimensional nanostructures such as nanospheres, nanoflowers, nanowires, nanorods, nanobelts, and so on. These sensing materials showed high resistive response towards O 2 [ 109 ], CO [ 109 , 124 , 129 , 135 , 140 , 154 , 155 ], CO 2 [ 158 ], H 2 [ 113 , 132 , 176 ], NH 3 [ 159 , 162 , 177 ], NO 2 [ 125 , 126 , 128 , 141 , 160 , 161 , 176 ], VOCs such as C 2 H 6 O [ 117 , 123 , 141 , 168 ], C 3 H 6 O [ 123 , 133 , 157 ], C 3 H 8 O [ 120 ], and water vapor [ 127 , 130 , 134 ], as reported by many authors. The operating temperature can be low to room temperature due to the large specific surface area and robust properties of nanostructures.…”

Section: Ga 2 O 3 -Based Gas Se...mentioning

confidence: 99%

“…Benefited from p–n heterostructure, Ga 2 O 3 /CuO thin film sensor exhibited 40% faster response time in comparison with pure CuO one. Sprincean et al [ 134 ] made a Ga 2 O 3 /GaS:Zn nanostructured room temperature humidity sensor, which demonstrated acceptable sensitivity on the air relative humidity in the range from 42 to 92% and stable static characteristics over 6 months.…”

Section: Ga 2 O 3 -Based Gas Se...mentioning

confidence: 99%

See 2 more Smart Citations

Gallium Oxide for Gas Sensor Applications: A Comprehensive Review

Zhu

et al. 2022

Materials

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Ga2O3 has emerged as a promising ultrawide bandgap semiconductor for numerous device applications owing to its excellent material properties. In this paper, we present a comprehensive review on major advances achieved over the past thirty years in the field of Ga2O3-based gas sensors. We begin with a brief introduction of the polymorphs and basic electric properties of Ga2O3. Next, we provide an overview of the typical preparation methods for the fabrication of Ga2O3-sensing material developed so far. Then, we will concentrate our discussion on the state-of-the-art Ga2O3-based gas sensor devices and put an emphasis on seven sophisticated strategies to improve their gas-sensing performance in terms of material engineering and device optimization. Finally, we give some concluding remarks and put forward some suggestions, including (i) construction of hybrid structures with two-dimensional materials and organic polymers, (ii) combination with density functional theoretical calculations and machine learning, and (iii) development of optical sensors using the characteristic optical spectra for the future development of novel Ga2O3-based gas sensors.

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Section: Preparation Methods Of Ga 2 O 3...mentioning

confidence: 99%

Section: Ga 2 O 3 -Based Gas Se...mentioning

confidence: 99%

Section: Ga 2 O 3 -Based Gas Se...mentioning

confidence: 99%

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Gallium Oxide for Gas Sensor Applications: A Comprehensive Review

Zhu

et al. 2022

Materials

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“…Generally, the performance of a capacitive humidity sensor is strongly correlated with the dielectric permittivity of functional nanomaterials between the electrodes 15 . Until now, various active materials have been investigated as flexible capacitive humidity sensors, such as carbon materials 10,16 , cellulose paper 17 , metal oxides 18,19 , metal sulfides 20,21 , and conductive polymer 22 . They are typically endowed with high hydrophilicity, large exposed surface areas and rich active sites to interact with water molecules.…”

Section: Introductionmentioning

confidence: 99%

Laser direct writing of Ga<sub>2</sub>O<sub>3</sub>/liquid metal-based flexible humidity sensors

Cui¹,

Lu²,

Kong³

et al. 2023

OEA

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Flexible and wearable humidity sensors play a vital role in daily point-of-care diagnosis and noncontact human-machine interactions. However, achieving a facile and high-speed fabrication approach to realizing flexible humidity sensors remains a challenge. In this work, a wearable capacitive-type Ga 2 O 3 /liquid metal-based humidity sensor is demonstrated by a one-step laser direct writing technique. Owing to the photothermal effect of laser, the Ga 2 O 3 -wrapped liquid metal particles can be selectively sintered and converted from insulative to conductive traces with a resistivity of 0.19 Ω•cm, while the untreated regions serve as active sensing layers in response to moisture changes. Under 95% relative humidity, the humidity sensor displays a highly stable performance along with rapid response and recover time. Utilizing these superior properties, the Ga 2 O 3 /liquid metal-based humidity sensor is able to monitor human respiration rate, as well as skin moisture of the palm under different physiological states for healthcare monitoring.

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“…gas sensor [5,6], red-light emission [7], rectifiers [8], lightemitting diode [9], and humidity sensor [10], etc. Such applications based on Ga 2 O 3 suggest a broad prospect.…”

Section: Introductionmentioning

confidence: 99%

Pressure sensing of Ga₂O₃ thin film

Liu¹,

Zhang²,

Zhang³

et al. 2023

Smart Mater. Struct.

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\In this paper, a Ga2O3-based pressure sensor is introduced via metalorganic chemical vapor deposition thin film growth technique. As an important semiconductor materials, it could achieve some functional electronics and optoelectronics, while Ga2O3-based pressure sensor is less investigated, inspite of that the natural property endows it the possibility. Here, the fabricated Ga2O3-based pressure sensor displayed decent sensing performance responding to various pressures. Under pressure of 5 kPa, the current increase two of orders with respect to the current without any additional pressure. Moreover, the response/release times were 0.18 s/0.15 s, 0.27 s/0.21 s, 0.32 s/0.23 s, and 0.38 s/0.24s under different pressures of 1, 5, 10 and 20 kPa. In all, this work provides a possible route for constructing smart pressure sensor based on functional Ga2O3 along with good sensing behaviors.

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Influence of the air humidity on the electrical conductivity of the β-Ga2O3-GaS structure: air humidity sensor

Cited by 8 publications

References 22 publications

Gallium Oxide for Gas Sensor Applications: A Comprehensive Review

Gallium Oxide for Gas Sensor Applications: A Comprehensive Review

Laser direct writing of Ga<sub>2</sub>O<sub>3</sub>/liquid metal-based flexible humidity sensors

Pressure sensing of Ga₂O₃ thin film

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Influence of the air humidity on the electrical conductivity of the β-Ga2O3-GaS structure: air humidity sensor

Cited by 8 publications

References 22 publications

Gallium Oxide for Gas Sensor Applications: A Comprehensive Review

Gallium Oxide for Gas Sensor Applications: A Comprehensive Review

Laser direct writing of Ga<sub>2</sub>O<sub>3</sub>/liquid metal-based flexible humidity sensors

Pressure sensing of Ga2O3 thin film

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Product

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Pressure sensing of Ga₂O₃ thin film