Room-Temperature Hydrogen-Sensing Capabilities of Pt-SnO2 and Pt-ZnO Composite Nanoceramics Occur via Two Different Mechanisms

Liu, Ming; Li, Pengcheng; Huang, Yong; Cheng, Liang; Hu, Yongming; Tang, Zilong; Chen, Wanping

doi:10.3390/nano11020504

Cited by 7 publications

(4 citation statements)

References 25 publications

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“…For Pt-SnO2 composite nanoceramics prepared using the solution reduction method, the optimum sintering temperature has been found to be around 825°C to yield both good mechanical strength and appealing room-temperature hydrogen sensing characteristics [31,33,34]. Figure 5 shows the room temperature hydrogen-sensitive properties of two samples of 0.5 wt% Pt sintered at 825°C while prepared using these two different Pt loading methods separately to make a further comparison.…”

Section: Resultsmentioning

confidence: 99%

“…In recent years, a number of advances have been made by investigating the room-temperature gas-sensitive properties of composite noble metal catalyst-metal oxide nanoceramics prepared by conventional pressing and sintering. Among them, Pt-SnO2 composite nanoceramics have been well studied with regard to their room temperature hydrogen sensing characteristics [13,[32][33][34]. In this study, Pt-SnO2 composite nanoceramics were prepared with Pt loaded from chloroplatinic acid using two methods, namely the solution reduction method and the impregnation method separately.…”

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confidence: 99%

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Room-Temperature Hydrogen Sensitive Pt-SnO2 Composite Nanoceramics: A Comparison Study on Two Different Pt Loading Methods

Zhao¹,

Song²,

Lu³

et al. 2023

Preprint

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Soluble noble metal salts are widely used for loading noble metals as nano-catalysts in many applications. In this paper, Pt-SnO2 composite nanoceramics were prepared from SnO2 nanoparticles and H2PtCl6 using two Pt-loading methods separately: For the solution reduction method, the H2PtCl6 solution was added to a suspension of SnO2 and zinc powder to form Pt on SnO2 nanoparticles; and for the impregnation method, Pt was formed from H2PtCl6 in the course of sintering. Although a series of samples prepared using both Pt loading methods showed a strong response to H2 at room temperature, the ones prepared using the solution reduction method exhibited much better room temperature hydrogen sensing characteristics. For two samples of 0.5 wt% Pt and sintered at 825°C, the response value for the sample prepared using the solution reduction method was 5300 to 1% H2-20% O2-N2, which was much larger than that of 150 for the sample prepared using the impregnation method. Samples prepared using the two Pt loading methods have similar microstructures as characterized by XRD, FESEM, EDS, TEM, and HRTEM. However, the residual chlorine content in those using the impregnation method was found to be higher than that using the solution reduction method through analysis. It is proposed that the striking difference in the room temperature hydrogen sensing characteristics among samples prepared using these two different Pt loading methods separately resulted from their different chlorine removal process. This study demonstrates the importance of a proper method in loading noble metals from their soluble salts as nano-catalysts in many applications.

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Section: Resultsmentioning

confidence: 99%

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confidence: 99%

Room-Temperature Hydrogen Sensitive Pt-SnO2 Composite Nanoceramics: A Comparison Study on Two Different Pt Loading Methods

Zhao¹,

Song²,

Lu³

et al. 2023

Preprint

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“…Nanoceramics provide another example, hard, wear resistant, high temperature resistant, and corrosion resistant. Ceramic products spiked with zinc oxide (ZnO)‐NPs have an antibacterial and deodorizing effect and a self‐cleaning effect that decomposes organic matter, greatly improving product quality 42 . The application of nanotechnology in the development of functional textile fabrics has also yielded some results, such as the addition of NPs such as TiO₂, ZnO, and SiO₂ to chemical fibers leading to ultraviolet (UV) rays absorption, which can effectively protect the human body from UV damage.…”

Section: Nanotechnology Application In Healthmentioning

confidence: 99%

Nanoparticles‐induced potential toxicity on human health: Applications, toxicity mechanisms, and evaluation models

Xuan

Zhao

Skonieczna

et al. 2023

MedComm

110

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Nanoparticles (NPs) have become one of the most popular objects of scientific study during the past decades. However, despite wealth of study reports, still there is a gap, particularly in health toxicology studies, underlying mechanisms, and related evaluation models to deeply understanding the NPs risk effects. In this review, we first present a comprehensive landscape of the applications of NPs on health, especially addressing the role of NPs in medical diagnosis, therapy. Then, the toxicity of NPs on health systems is introduced. We describe in detail the effects of NPs on various systems, including respiratory, nervous, endocrine, immune, and reproductive systems, and the carcinogenicity of NPs. Furthermore, we unravels the underlying mechanisms of NPs including ROS accumulation, mitochondrial damage, inflammatory reaction, apoptosis, DNA damage, cell cycle, and epigenetic regulation. In addition, the classical study models such as cell lines and mice and the emerging models such as 3D organoids used for evaluating the toxicity or scientific study are both introduced. Overall, this review presents a critical summary and evaluation of the state of understanding of NPs, giving readers more better understanding of the NPs toxicology to remedy key gaps in knowledge and techniques.

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“…In the second strategy, the catalytic effect of noble metals (e.g., Pt and Pd) is utilized to achieve room-temperature gas sensing. Highly remarkable room-temperature gas sensing capabilities have been observed in many composite ceramics of noble metals and metal-oxide semiconductors (e.g., TiO 2 , WO 3 , Nb 2 O 5 , SnO 2 and ZnO), which were prepared through traditional pressing and sintering [ 25 , 26 , 27 , 28 , 29 , 30 ]. It is worthy to note that for composites of Pt with micron-sized WO 3 and SnO 2 agglomerate powder [ 26 , 27 ], surprisingly strong room-temperature responses to hydrogen and an extraordinarily high moisture resistance have been observed, which is especially important for practical room-temperature gas sensing applications.…”

Section: Introductionmentioning

confidence: 99%

NO2 Sensing Capability of Pt–Au–SnO2 Composite Nanoceramics at Room Temperature

Song

et al. 2023

Molecules

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Composite ceramics of metal oxides and noble metals have received much attention for sensing reducing gases at room temperature. Presently, composite ceramics of SnO2 and noble metals have been prepared and investigated for sensing oxidizing NO2 at room temperature. While dramatic increases in resistance were observed for both 1 wt% Pt–SnO2 and 5 wt% Au–SnO2 composite nanoceramics after being exposed to NO2 at room temperature, the largest increase in resistance was observed for 1 wt% Pt–5 wt% –Au–SnO2 composite nanoceramics among the three composites. The response to 0.5 ppm NO2-–20% O2–N2 was as high as 875 at room temperature, with a response time of 2566 s and a recovery time of 450 s in the air of 50% relative humidity (RH). Further investigation revealed that water molecules in the air are essential for recovering the resistance of Pt–Au–SnO2 composite nanoceramics. A room temperature NO2-sensing mechanism has been established, in which NO2 molecules are catalyzed by Pt–Au to be chemisorbed on SnO2 at room temperature, and desorbed from SnO2 by the attraction of water molecules in the air. These results suggest that composite ceramics of metal oxides and noble metals should be promising for room temperature sensing, not only reducing gases, but also oxidizing gases.

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Room-Temperature Hydrogen-Sensing Capabilities of Pt-SnO2 and Pt-ZnO Composite Nanoceramics Occur via Two Different Mechanisms

Cited by 7 publications

References 25 publications

Room-Temperature Hydrogen Sensitive Pt-SnO2 Composite Nanoceramics: A Comparison Study on Two Different Pt Loading Methods

Room-Temperature Hydrogen Sensitive Pt-SnO2 Composite Nanoceramics: A Comparison Study on Two Different Pt Loading Methods

Nanoparticles‐induced potential toxicity on human health: Applications, toxicity mechanisms, and evaluation models

NO2 Sensing Capability of Pt–Au–SnO2 Composite Nanoceramics at Room Temperature

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