Enhanced H2S gas sensing properties of undoped ZnO nanocrystalline films from QDs by low-temperature processing

Deng, Jie; Fu, Qiuyun; Luo, Wei; Tong, Xiaohu; Xiong, Jiahui; Hu, Yunxiang; Zheng, Zhiping

doi:10.1016/j.snb.2015.10.022

Cited by 69 publications

(29 citation statements)

References 32 publications

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“…The XRD pattern exhibits nine well defined diffraction peaks and all the peaks are indexed with the help of joint committee on powder diffraction standards (JCPDS card no. 36-1451) ( Deng et al, 2016 ). These peaks are corresponding to (100), (002), (101), (102), (110), (103), (200), (112), and (201) planes which suggest the formation of wurtzite type crystal structure.…”

Section: Resultsmentioning

confidence: 99%

Application of ZnO Nanoparticles for Improving the Thermal and pH Stability of Crude Cellulase Obtained from Aspergillus fumigatus AA001

Srivastava

Mishra

et al. 2016

Front. Microbiol.

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Cellulases are the enzymes which are responsible for the hydrolysis of cellulosic biomass. In this study thermal and pH stability of crude cellulase has been investigated in the presence of zinc oxide (ZnO) nanoparticles. We synthesized ZnO nanoparticle by sol-gel method and characterized through various techniques including, X-ray Diffraction, ultraviolet-visible spectroscope, field emission scanning electron microscope and high resolution scanning electron microscope. The crude thermostable cellulase has been obtained from the Aspergillus fumigatus AA001 and treated with ZnO nanoparticle which shows thermal stability at 65°C up to 10 h whereas it showed pH stability in the alkaline pH range and retained its 53% of relative activity at pH 10.5. These findings may be promising in the area of biofuels production.

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Section: Resultsmentioning

confidence: 99%

Application of ZnO Nanoparticles for Improving the Thermal and pH Stability of Crude Cellulase Obtained from Aspergillus fumigatus AA001

Srivastava

Mishra

et al. 2016

Front. Microbiol.

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“…Using a colloidal procedure and spin coating method, Deng et al [50] fabricated a super sensitive H 2 S gas sensor made of ZnO QDs of less than 4 nm in diameter. Low temperature annealing significantly enhanced the fabricated films conductivity while preserving the average grain size to below twice the Debye length.…”

Section: Zero-dimensional (0d) Gas Sensorsmentioning

confidence: 99%

Nanostructured Gas Sensors for Medical and Health Applications: Low to High Dimensional Materials

Nasiri

Clarke

2019

Biosensors

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Human breath has long been known as a system that can be used to diagnose diseases. With advancements in modern nanotechnology, gas sensors can now diagnose, predict, and monitor a wide range of diseases from human breath. From cancer to diabetes, the need to treat at the earliest stages of a disease to both increase patient outcomes and decrease treatment costs is vital. Therefore, it is the promising candidate of rapid and non-invasive human breath gas sensors over traditional methods that will fulfill this need. In this review, we focus on the nano-dimensional design of current state-of-the-art gas sensors, which have achieved records in selectivity, specificity, and sensitivity. We highlight the methods of fabrication for these devices and relate their nano-dimensional materials to their record performance to provide a pathway for the gas sensors that will supersede.

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“…O monitoramento quantitativo do gás sulfídrico é de extrema relevância, por ser uma substância altamente tóxica, incolor e inflamável. Filmes de QDs de ZnO em substratos de alumina foram preparados quimicamente, via rota úmida, para a avaliação do potencial do sistema como sensor para o H 2 S. 158 A ideia da estratégia está baseada na resposta de condutividade. Os filmes mostraram-se mais eficientes quando tratados termicamente a 300 °C, elevando o tamanho dos cristais, mas propiciando o desenvolvimento de estruturas alongadas que melhoraram a condutividade do filme.…”

Section: Uso De Qds Como Quimiossensoresunclassified

Pontos quânticos ambientalmente amigáveis: destaque para o óxido de zinco

Sandri¹,

Krieger²,

Costa³

et al. 2017

Quim. Nova

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ENVIRONMENTALLY FRIENDLY QUANTUM DOTS: HIGHLIGHTING ZINC OXIDE. Semiconductor nanocrystals with sizes in the quantum confinement regime (2-10 nm) present special physical and chemical properties. Additionally, environment-friendly quantum dots (QDs), as zinc oxide and zinc sulfide, offer many practical usages. Herein the ZnO semiconductor nanocrystals properties will be preferentially explored, such as its luminescence, broad spectrum UV absorber and electronics performances, and therefore its multifunctionality, as well as its advantages compared to some toxics QDs. A review is carefully presented stressing some synthesis approaches for applications reasons toward devices, chemosensors, biological labels, UV-absorbers and photocatalysis. ZnO QDs have been used in combination with organic and other inorganic materials. Hybrid materials have many advantages compared to their individual contents leading to important contributions to science and technology. As a result, an important growth in material fields is noticeable.Keywords: ZnO quantum dots; environment-friendly quantum dots; photocatalysis; UV-blockers; size-dependent fluorescence emission. INTRODUÇÃOÉ notória a contribuição da nanotecnologia nas ciências biológi-cas, farmacêuticas e da saúde nestas últimas três décadas. Como resultado, tem-se observado uma oferta cada vez maior de novos materiais, inteligentes e funcionais, o melhoramento da qualidade de vida das pessoas e, consequentemente, um aumento na expectativa de vida. 1No início da década de 1980 apareceram os primeiros estudos para uma nova classe de nanocristais com capacidade de exibir propriedades espectroscópicas dependentes do tamanho, 2 advindas do efeito de confinamento quântico.3-5 O confinamento quântico é resultado da mudança da densidade dos estados eletrônicos, que por sua vez, está relacionada com a posição e momento para partículas livres e confinadas. Quando a energia e o momento são definidos, a posição destas partículas não pode ser definida com precisão. Se considerada a relação entre energia e momento para a fase sólida massiva, é como pensar que uma série de vibrações que ocorrem com pequenas diferenças de energia nesta fase serão comprimidas, gerando uma transição intensa e única em um ponto quântico (QD, do inglês quantum dot).5 Dita de outra maneira, com a redução do tamanho das partículas a excitação eletrônica é deslocada para regiões de maior energia e o oscilador fica com restrita capacidade de transição. A Figura 1 ilustra a densidade de estados partindo de um material massivo, tridimensional (a) e que, progressivamente, sofre o confinamento em uma das dimensões (b)-(d). 5QDs podem confinar transportadores de cargas e manter uma coerência de spin destes transportadores em um período de tempo maior que os correspondentes materiais massivos, característica essa fundamental para o desenvolvimento de tecnologia baseada em sistemas quânticos 6 e da manifestação de efeitos excitônicos expressivos, os quais dependem da forma e tamanho da estrutura de confinamento. 7A incidênc...

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Enhanced H2S gas sensing properties of undoped ZnO nanocrystalline films from QDs by low-temperature processing

Cited by 69 publications

References 32 publications

Application of ZnO Nanoparticles for Improving the Thermal and pH Stability of Crude Cellulase Obtained from Aspergillus fumigatus AA001

Application of ZnO Nanoparticles for Improving the Thermal and pH Stability of Crude Cellulase Obtained from Aspergillus fumigatus AA001

Nanostructured Gas Sensors for Medical and Health Applications: Low to High Dimensional Materials

Pontos quânticos ambientalmente amigáveis: destaque para o óxido de zinco

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