Pd-Decorated ZnO Hexagonal Microdiscs for NH3 Sensor

Li, Yi; Zhang, Boyu; Li, Juan; Duan, Zaihua; Yang, Yajie; Yuan, Zhen; Jiang, Yadong; Tai, Huiling

doi:10.3390/chemosensors12030043

Cited by 30 publications

(8 citation statements)

References 61 publications

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“…The nature of the second peak is more disputable. Commonly, it is attributed to oxygen vacancies in ZnO nanoparticles [16,57], which, if located on the surface of the ZnO nanoparticles, form dangling bonds. However, Frankcombe et al found this to be a misinterpretation, instead attributing the spectral component at these BEs to the OH-related species [58].…”

Section: Core-level Studies Of the Amg And Am-znomentioning

confidence: 99%

Rationalizing Graphene–ZnO Composites for Gas Sensing via Functionalization with Amines

Rabchinskii,

Sysoev,

Brzhezinskaya

et al. 2024

Nanomaterials

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The rational design of composites based on graphene/metal oxides is one of the pillars for advancing their application in various practical fields, particularly gas sensing. In this study, a uniform distribution of ZnO nanoparticles (NPs) through the graphene layer was achieved, taking advantage of amine functionalization. The beneficial effect of amine groups on the arrangement of ZnO NPs and the efficiency of their immobilization was revealed by core-level spectroscopy, pointing out strong ionic bonding between the aminated graphene (AmG) and ZnO. The stability of the resulting Am-ZnO nanocomposite was confirmed by demonstrating that its morphology remains unchanged even after prolonged heating up to 350 °C, as observed by electron microscopy. On-chip multisensor arrays composed of both AmG and Am-ZnO were fabricated and thoroughly tested, showing almost tenfold enhancement of the chemiresistive response upon decorating the AmG layer with ZnO nanoparticles, due to the formation of p-n heterojunctions. Operating at room temperature, the fabricated multisensor chips exhibited high robustness and a detection limit of 3.6 ppm and 5.1 ppm for ammonia and ethanol, respectively. Precise identification of the studied analytes was achieved by employing the pattern recognition technique based on linear discriminant analysis to process the acquired multisensor response.

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Section: Core-level Studies Of the Amg And Am-znomentioning

confidence: 99%

Rationalizing Graphene–ZnO Composites for Gas Sensing via Functionalization with Amines

Rabchinskii,

Sysoev,

Brzhezinskaya

et al. 2024

Nanomaterials

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“…The response time and recovery time of the sensor were defined as the time to attain 90% of the maximum response value and the time to return back to 10% of the total response value (as illustrated in Figure S3). The relative humidity (RH) value in the test chamber is controlled by mixing dry and humidity gases via mass flow meters. , The humidity gas is obtained by filling a N 2 gas flow through different saturated salt solutions.…”

Section: Experimental Sectionmentioning

confidence: 99%

Ti₃C₂T_x Nanosheet/Bi₂S₃ Nanobelt Composites for NO₂ Gas Sensing

Li,

Tao,

Zhang

et al. 2024

ACS Appl. Nano Mater.

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Along with the revolution of the Internet of Things (IoT), smart, flexible, easily fabricated, and highly sensitive gas sensors are essential for many portable electronics. In this study, a wearable NO 2 sensor based on a nanomesh structure woven with Ti 3 C 2 T x microflakes and Bi 2 S 3 nanobelts operated at room temperature was successfully designed and prepared. The effects of the mass ratio between two materials on the performance were evaluated. Bi 2 S 3 nanobelts embedded inside accordion-like Ti 3 C 2 T x provide large specific surface areas and abundant active sites for the adsorption of NO 2 molecules. Attributed to the high conductivity of Ti 3 C 2 T x , the carriers generated in the sensitive layers are easily transmitted during sensing, thus significantly reducing the response and recovery times. The sensor based on the nanomesh containing 30 wt % Ti 3 C 2 T x exhibits excellent sensing performance, fast response/recovery rates, and high stability even in arbitrary deformed shape conditions. Upon exposure to 1 ppm NO 2 , the response of the sensor is 12.67, and the response/recovery times are 5/28 s, respectively. A stable sensing performance can be maintained after 1500 cycles of deformation. This work demonstrates a simple but reliable manufacturing strategy of wearable gas sensors for the next generation of IoT monitoring network-linking human activities.

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“…The resistances in air (R a ) and in the presence of the target gas (R g ) were measured constantly, and the sensor response was calculated as R = R g /R a for NO 2 gas and vice versa for reducing gases. Additionally, the response time (τ res ) and recovery time (τ rec ) were defined as the times required for the resistance to reach its 90% final value after injection and stoppage of NO 2 gas, respectively [48]. During the gas sensing tests, the relative humidity (RH) in the chamber was 30% at RT.…”

Section: Gas Sensing Testsmentioning

confidence: 99%

SnO2 Nanowire/MoS2 Nanosheet Composite Gas Sensor in Self-Heating Mode for Selective and ppb-Level Detection of NO2 Gas

Kim,

Mirzaei,

Kim

2024

Chemosensors

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The development of low-cost and low-power gas sensors for reliable NO2 gas detection is important due to the highly toxic nature of NO2 gas. Herein, initially, SnO2 nanowires (NWs) were synthesized through a simple vapor–liquid–solid growth mechanism. Subsequently, different amounts of SnO2 NWs were composited with MoS2 nanosheets (NSs) to fabricate SnO2 NWs/MoS2 NS nanocomposite gas sensors for NO2 gas sensing. The operation of the sensors in self-heating mode at 1–3.5 V showed that the sensor with 20 wt.% SnO2 (SM-20 nanocomposite) had the highest response of 13 to 1000 ppb NO2 under 3.2 V applied voltage. Furthermore, the SM-20 nanocomposite gas sensor exhibited high selectivity and excellent long-term stability. The enhanced NO2 gas response was ascribed to the formation of n-n heterojunctions between SnO2 NWs and MoS2, high surface area, and the presence of some voids in the SM-20 composite gas sensor due to having different morphologies of SnO2 NWs and MoS2 NSs. It is believed that the present strategy combining MoS2 and SnO2 with different morphologies and different sensing properties is a good approach to realize high-performance NO2 gas sensors with merits such as simple synthesis and fabrication procedures, low cost, and low power consumption, which are currently in demand in the gas sensor market.

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Pd-Decorated ZnO Hexagonal Microdiscs for NH3 Sensor

Cited by 30 publications

References 61 publications

Rationalizing Graphene–ZnO Composites for Gas Sensing via Functionalization with Amines

Rationalizing Graphene–ZnO Composites for Gas Sensing via Functionalization with Amines

Ti₃C₂T_x Nanosheet/Bi₂S₃ Nanobelt Composites for NO₂ Gas Sensing

SnO2 Nanowire/MoS2 Nanosheet Composite Gas Sensor in Self-Heating Mode for Selective and ppb-Level Detection of NO2 Gas

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Pd-Decorated ZnO Hexagonal Microdiscs for NH3 Sensor

Cited by 30 publications

References 61 publications

Rationalizing Graphene–ZnO Composites for Gas Sensing via Functionalization with Amines

Rationalizing Graphene–ZnO Composites for Gas Sensing via Functionalization with Amines

Ti3C2Tx Nanosheet/Bi2S3 Nanobelt Composites for NO2 Gas Sensing

SnO2 Nanowire/MoS2 Nanosheet Composite Gas Sensor in Self-Heating Mode for Selective and ppb-Level Detection of NO2 Gas

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Ti₃C₂T_x Nanosheet/Bi₂S₃ Nanobelt Composites for NO₂ Gas Sensing