A novel method for the preparation of NH3 sensors based on ZnO-In thin films

Sberveglieri, G.; Groppelli, S.; Nelli, P.; Tintinelli, Alberto; Giunta, Giuseppe

doi:10.1016/0925-4005(95)85128-3

Cited by 152 publications

(66 citation statements)

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“…Zinc oxide (ZnO), an important II-VI semiconductor with a bandgap of 3.37 eV and a large exciton binding energy of 60 meV, has been extensively studied because of its potential applications in solar cells, [1] sensors, [2,3] photocatalysis, [4] etc. Over the past few years, tremendous efforts have been made to synthesize diverse nanometer-scaled ZnO building blocks (e.g., nanoparticles, nanowires, nanobelts, nanotubes, and nanosheets) with controlled sizes and morphologies.…”

Section: Introductionmentioning

confidence: 99%

ZnO Hierarchical Micro/Nanoarchitectures: Solvothermal Synthesis and Structurally Enhanced Photocatalytic Performance

Cai

Zhang

2008

Adv Funct Materials

598

345

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A novel ZnO hierarchical micro/nanoarchitecture is fabricated by a facile solvothermal approach in an aqueous solution of ethylenediamine (EDA). This complex architecture is of a core/shell structure, composed of dense nanosheet‐built networks that stand on a hexagonal‐pyramid‐like microcrystal (core part). The ZnO hexagonal micropyramid has external surfaces that consist of a basal plane (000${\bar 1}$) and lateral planes {0${\bar 1}$11}. The nanosheets are a uniform thickness of about 10 nm and have a single‐crystal structure with sheet‐planar surfaces as {2${\bar 1}\,{\bar 1}$0} planes. These nanosheets interlace and overlap each other with an angle of 60° or 120°, and assemble into a discernible net‐ or grid‐like morphology (about 100 nm in grid‐size) on the micropyramid, which shows a high specific surface area (185.6 m2 g−1). Such a ZnO micro/nanoarchitecture is new in the family of ZnO nanostructures. Its formation depends on the concentration of the EDA solution as well as on the type of zinc source. A two‐step sequential growth model is proposed based on observations from a time‐dependent morphology evolution process. Importantly, such structured ZnO has shown a strong structure‐induced enhancement of photocatalytic performance and has exhibited a much better photocatalytic property and durability for the photodegradation of methyl orange than that of other nanostructured ZnO, such as the powders of nanoparticles, nanosheets, and nanoneedles. This is mainly attributed to its higher surface‐to‐volume ratio and stability against aggregation. This work not only gives insight into understanding the hierarchical growth behaviour of complex ZnO micro/nanoarchitectures in a solution‐phase synthetic system, but also provides an efficient route to enhance the photocatalytic performance of ZnO, which could also be extended to other catalysts, such as the inherently excellent TiO2, if they are of the same hierarchical micro/nanoarchitecture with an open and porous nanostructured surface layer.

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Section: Introductionmentioning

confidence: 99%

ZnO Hierarchical Micro/Nanoarchitectures: Solvothermal Synthesis and Structurally Enhanced Photocatalytic Performance

Cai

Zhang

2008

Adv Funct Materials

598

345

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“…Òàáë.2). Îñê³ëüêè ëåãóâàííÿ çá³ëüøóº ê³ëüê³ñòü àäñîðáö³éíèõ öåíòð³â (çá³ëüøóºòüñÿ âåëè÷èíà àäñîðáö³¿ äàíîãî ãàçó) [3][4][5][6].…”

Section: ðåçóëüòàòè äîñë³äAeåííÿ òà ¿õ îáãîâîðåííÿunclassified

THIN-FILM SENSOR ON BASIS ZnO

Лазоренко¹,

Bugayov²,

Lashkarev³

et al. 2014

SEMST

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Àíîòàö³ÿÃàçîâà ñåíñîðèêà º îäí³ºþ ç òèõ ãàëóçåé åëåêòðîí³êè, ùî îñòàíí³ì ÷àñîì íàéá³ëüø äè-íàì³÷íî ðîçâèâàºòüñÿ. Ïîòðåáà â ðîçðîáö³ ãàçîâèõ ñåíñîð³â îáóìîâëåíà íåîáõ³äí³ñòþ êîíò-ðîëþ åêîëîã³÷íîãî ñòàíó îòî÷óþ÷îãî ñåðåäîâèùà òà çàáåçïå÷åííÿ áåçïåêè aeèòòºä³ÿëüíîñò³ ëþäèíè.Íàï³âïðîâ³äíèêîâ³ ñåíñîðè º íàéá³ëüø ïåðñïåêòèâíèìè ãàçîâèìè ñåíñîðàìè, îñê³ëüêè âîíè ìàþòü ìàë³ ðîçì³ðè, ïðîñòó êîíñòðóêö³þ, ìàëå ñïîaeèâàííÿ åëåêòðîåíåðã³¿, âèãîòî-âëÿþòüñÿ çà ãðóïîâîþ òåõíîëîã³ºþ ì³êðîåëåêòðîí³êè, ùî çàáåçïå÷óº ¿õ ïîð³âíÿíî íèçüêó âàðò³ñòü òà ñóì³ñí³ñòü ç åëåêòðîííèìè ïðèëàäàìè äëÿ ïîäàëüøî¿ îáðîáêè ñèãíàë³â.Îáëàñòü âèêîðèñòàííÿ ãàçîâèõ ñåíñîð³â, ùî ðåàãóþòü íà ïàðè ñïèðòó, çàëåaeèòü â³ä âè-ì³ðþâàíèõ êîíöåíòðàö³é. Òàê, â îáëàñò³ íèçüêèõ êîíöåíòðàö³é (ïîðÿäêó ê³ëüêîõ ppm) òàê³ ñåíñîðè çàñòîñîâóþòüñÿ äëÿ àíàë³çó âì³ñòó àëêîãîëþ ó ïîäèõó ëþäèíè. Òîä³ ÿê ñåíñîðè, ÿê³ ïðàöþþòü â îáëàñò³ âèñîêèõ êîíöåíòðàö³é, ïîòð³áí³ äëÿ êîíòðîëþ á³îòåõíîëîã³÷íèõ ïðîöå-ñ³â ïðè âèãîòîâëåíí³ ñïèðòíèõ íàïî¿â ó õàð÷îâ³é ïðîìèñëîâîñò³.Â ðîáîò³ äîñë³äaeåíî ÷óòëèâ³ñòü òîíêîïë³âêîâèõ ãàçîâèõ ñåíñîð³â ðåçèñòèâíîãî òèïó íà îñíîâ³ îêñèäó öèíêó äî ïàð³â åòèëîâîãî ñïèðòó.Âèâ÷åíî çì³íó îïîðó ãàçî÷óòëèâî¿ ïë³âêè ïðè ä³¿ ãàçó. ßêùî ñåíñîð, ãàçî÷óòëèâèì åëå-ìåíòîì ÿêîãî º íàï³âïðîâ³äíèêîâà ïë³âêà n-òèïó (ZnO), ï³äëÿãàº âïëèâó ïàðó åòèëîâîãî ñïèðòó, îï³ð ÷óòëèâîãî åëåìåíòà çìåíøóºòüñÿ.Âñòàíîâëåíî âïëèâ ëåãóâàííÿ íà âåëè÷èíó ÷óòëèâîñò³ ãàçîâîãî ñåíñîðà. Äîì³øêè Al òà In ïîêðàùóþòü ÷óòëèâ³ñòü òîíêîïë³âêîâîãî ñåíñîðà íà îñíîâ³ ZnO.Îáãîâîðþþòüñÿ ìåõàí³çìè ÷óòëèâîñò³ ñåíñîðà íà îñíîâ³ ïë³âêè ZnO äî ïàð³â åòàíîëó òà âïëèâó äîì³øîê íà éîãî ÷óòëèâ³ñòü.

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“…1 Introduction Zinc Oxide (ZnO) has been the subject of intensive research over the last two decades because of the vast variety of its applications which include varistors [1] optical devices [2] transparent electrodes in solar cells [3,4], piezoelectric devices [5] surface acoustic wave (SAW) devices [6] gas sensors [7][8][9] and catalysis [10,11]. The aim of this work is to investigate the optical properties of ZnO thin layers obtained by thermal oxidation of metallic zinc films deposited on silica substrate.…”

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confidence: 99%

Growth of zinc oxide nanostructures via thermal oxidation of DC‐sputtered zinc films

Abdallah

Tabet

Dastageer

et al. 2011

Phys. Status Solidi (c)

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Zinc oxide (ZnO) nanostructures have been obtained by thermal oxidation of DC‐ sputtered Zinc film (Zn) above the melting temperature of Zinc. The zinc film is directly deposited on the glass substrate or on a ZnO layer pre‐deposited on the glass by DC reactive plasma. The films were characterized by X‐ray Diffraction before and after oxidation treatment. Field Emission Scanning Electron Microscopy (FE‐SEM) revealed the formation of needlelike and nanostructured network. The optical properties of the obtained nanostructures were studied using UV‐VIS‐NIR spectrophotometer. The results showed that the presence of pre‐deposited ZnO layer on the glass substrate improves significantly the transmittance of the obtained layered structure. Photoluminescence results showed the presence of a weak near band edge emission at 3.35 eV and a defect band which is much broader than that observed in pure Zinc Oxide (© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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A novel method for the preparation of NH3 sensors based on ZnO-In thin films

Cited by 152 publications

References 9 publications

ZnO Hierarchical Micro/Nanoarchitectures: Solvothermal Synthesis and Structurally Enhanced Photocatalytic Performance

ZnO Hierarchical Micro/Nanoarchitectures: Solvothermal Synthesis and Structurally Enhanced Photocatalytic Performance

THIN-FILM SENSOR ON BASIS ZnO

Growth of zinc oxide nanostructures via thermal oxidation of DC‐sputtered zinc films

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