Hollow ZnO nanorices prepared by a simple hydrothermal method for NO<sub>2</sub> and SO<sub>2</sub> gas sensors

Minh, Luu Hoang; Thu, Pham Thi Thuy; Thanh, Bui Quang; Hanh, Nguyen Thi; Hanh, Do Thi Thu; Toàn, Nguyễn Văn; Hung, Chu Manh; Duy, Nguyễn Văn; Tong, Pham Van; Hòa, Nguyễn Đức

doi:10.1039/d1ra05912b

Cited by 19 publications

(7 citation statements)

References 71 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…6f, the filamentous CuPc film sensors of 75 mg mL −1 could monitor NO 2 gas with the lowest concentration of 0.3ppm, which was close to the detection limit of the sensors based on ZnO hollow nanowires prepared by a simple hydrothermal method. 29 In conclusion, the filamentous CuPc films sensors with 75 mg mL −1 solution concentration had the best gas sensitivity.…”

Section: Resultsmentioning

confidence: 81%

Solution-processed filamentous copper phthalocyanine films for enhanced NO₂ gas sensing at room temperature

Cui,

Wang,

Zhu

et al. 2024

New J. Chem.

View full text Add to dashboard Cite

show abstract

Section: Resultsmentioning

confidence: 81%

Solution-processed filamentous copper phthalocyanine films for enhanced NO₂ gas sensing at room temperature

Cui,

Wang,

Zhu

et al. 2024

New J. Chem.

View full text Add to dashboard Cite

show abstract

“…Metal-oxide semiconductor (MOX)-based chemoresistive gas sensors are a compelling alternative, showcasing not only high sensitivity but also cost-effectiveness, scalable manufacturing, durability, and seamless integration into Internet of Things (IoT) systems [12]. Previous experimental and theoretical works proved that MOX-based nanostructured materials, such as SnO 2 , WO 3 , and ZnO are potential candidates to detect SO 2 [7,[13][14][15][16][17][18]. Nonetheless, the investigation of MOX for SO 2 detection has been hampered by evidence of irreversible interactions between this analyte and the active groups over the sensing layers [19], resulting in sensor instability and a short lifetime.…”

Section: Introductionmentioning

confidence: 99%

SO2 Detection over a Wide Range of Concentrations: An Exploration on MOX-Based Gas Sensors

Rossi,

Spagnoli,

Visonà

et al. 2024

Chemosensors

View full text Add to dashboard Cite

Noxious gases such as sulfur-containing compounds can inflict several different adverse effects on human health even when present at extremely low concentrations. The accurate detection of these gases at sub-parts per million levels is imperative, particularly in fields where maintaining optimal air quality is crucial. In this study, we harnessed the capabilities of nanostructured metal-oxide semiconducting materials to detect sulfur dioxide, since they have been extensively explored starting from the last decades for their effectiveness in monitoring toxic gases. We systematically characterized the sensing performance of seven chemoresistive devices. As a result, the SnO2:Au sensor demonstrated to be the most promising candidate for sulfur dioxide detection, owing to its highly sensitivity (0.5–10 ppm), humidity-independent behavior (30 RH% onwards), and selectivity vs. different gases at an operating temperature of 400 °C. This comprehensive investigation facilitates a detailed performance comparison to other devices explored for the SO2 sensing, supporting advancements in gas detection technology for enhanced workplace and environmental safety.

show abstract

“…10 ZnO nanocrystals are also often prepared in hydrothermal reactors, which is a highpressure reaction technique. 11,12 However, in all such studies, there is no information on the pressure parameter due to difficulty in measurement of pressure. structure and optical properties of ZnO nanostructures in the conventional sol−gel method.…”

Section: Introductionmentioning

confidence: 99%

“…Pressure is known to have a significant influence on the structure and properties of nanoparticles. , The compounds with intermediate oxidation states can also be stabilized under high-pressure synthesis conditions . ZnO nanocrystals are also often prepared in hydrothermal reactors, which is a high-pressure reaction technique. , However, in all such studies, there is no information on the pressure parameter due to difficulty in measurement of pressure. Hence, we aim to do a systematic investigation on how change in pressure affects the structure and optical properties of ZnO nanostructures in the conventional sol–gel method.…”

Section: Introductionmentioning

confidence: 99%

In Situ Pressure Controlled Growth of ZnO Nanoparticles: Tailoring Sizes, Defects, and Optical Properties

2023

View full text Add to dashboard Cite

ZnO, being an inexpensive, wide band gap semiconductor that possesses high mechanical, thermal, and chemical stabilities and suitable for a wide range of optical and electronic applications, is the preferred semiconductor of this era. In an effort to fully utilize its potential features, ZnO research is receiving increasing attention. This study investigates the influence of pressure on the crystallinity, defect density, size, and morphology of ZnO nanoparticles, synthesized using nonaqueous sol–gel method, and their respective impact on the optical properties. High-crystalline ZnO nanocrystals with a hexagonal wurtzite structure were synthesized at various pressures, including ambient pressure, 25, 37.5, 50, and 100 bars inside a high-pressure reactor. With the increase in pressure, a reduction in particle size was observed, reaching a minimum size (∼10 nm) at 50 bar pressure (ZnO-50). Further increase in pressure causes an enhancement in the particle size. This trend of size variation with pressure is attributed to a tradeoff between esterification and nucleation processes. Contrary to the expectation, smaller ZnO nanocrystals synthesized by the present method possess lesser number of defects, suggesting that high-pressure synthesis is a unique way that offers smaller ZnO nanocrystals of sub-10 nm sizes having high crystallinity and lesser defects in a shorter time span. Also, the optical transmittance of the systems could be greatly enhanced by carefully tuning the particle sizes, with ZnO-50 (∼10 nm particle size) having the highest transmittance (∼95% at 600 nm) among all samples. High crystallinity, uniform morphology, excellent visible transparency, wide band gap, and low defect density make these smaller ZnO nanocrystals a preferred choice for ultraviolet sensors and other optoelectronic devices.

show abstract

Hollow ZnO nanorices prepared by a simple hydrothermal method for NO₂ and SO₂ gas sensors

Abstract: Hollow ZnO nanorices with an ultrathin shell show excellent response to NO2 and SO2 gases.

Cited by 19 publications

References 71 publications

Solution-processed filamentous copper phthalocyanine films for enhanced NO₂ gas sensing at room temperature

Solution-processed filamentous copper phthalocyanine films for enhanced NO₂ gas sensing at room temperature

SO2 Detection over a Wide Range of Concentrations: An Exploration on MOX-Based Gas Sensors

In Situ Pressure Controlled Growth of ZnO Nanoparticles: Tailoring Sizes, Defects, and Optical Properties

Contact Info

Product

Resources

About

Hollow ZnO nanorices prepared by a simple hydrothermal method for NO2 and SO2 gas sensors

Abstract: Hollow ZnO nanorices with an ultrathin shell show excellent response to NO2 and SO2 gases.

Cited by 19 publications

References 71 publications

Solution-processed filamentous copper phthalocyanine films for enhanced NO2 gas sensing at room temperature

Solution-processed filamentous copper phthalocyanine films for enhanced NO2 gas sensing at room temperature

SO2 Detection over a Wide Range of Concentrations: An Exploration on MOX-Based Gas Sensors

In Situ Pressure Controlled Growth of ZnO Nanoparticles: Tailoring Sizes, Defects, and Optical Properties

Contact Info

Product

Resources

About

Hollow ZnO nanorices prepared by a simple hydrothermal method for NO₂ and SO₂ gas sensors

Solution-processed filamentous copper phthalocyanine films for enhanced NO₂ gas sensing at room temperature

Solution-processed filamentous copper phthalocyanine films for enhanced NO₂ gas sensing at room temperature