Abstract
Nickel oxide has been widely used in chemical sensing applications, because it has an excellent p-type semiconducting property with high chemical stability. Here, we present a novel technique of fabricating three-dimensional porous nitrogen-doped nickel oxide nanosheets as a highly sensitive NO2 sensor. The elaborate nanostructure was prepared by a simple and effective hydrothermal synthesis method. Subsequently, nitrogen doping was achieved by thermal treatment with ammonia gas. When the p-type dopant, i.e., nitrogen atoms, was introduced in the three-dimensional nanostructures, the nickel-oxide-nanosheet-based sensor showed considerable NO2 sensing ability with two-fold higher responsivity and sensitivity compared to non-doped nickel-oxide-based sensors.
Highlights
Nitrogen dioxide (NO2) is an important air pollutant because it contributes to the formation of photochemical smog, which has significantly harmful impacts on human health
nickel oxide (NiO), a well-known stable p-type semiconducting metal oxide, has a high melting point (1960 ◦C) and excellent chemical stability. It has been extensively employed as electrodes in lithium ion batteries and supercapacitors, as electro-catalysts in combustion gas sensing, and in electrochromic devices [7–9]
A novel nanostructure with a high specific surface area is essential for enhanced performance of the NiO-based devices, which can be achieved by reactive sputtering, sol–gel methods, and hydrothermal treatments [10–14]
Summary
Nitrogen dioxide (NO2) is an important air pollutant because it contributes to the formation of photochemical smog, which has significantly harmful impacts on human health. Among the various types of gas sensors, semiconducting metal oxide gas sensors have attracted much attention because of their low cost, ease of production, simplicity of use, and ability to detect numerous gases, e.g., those using tungsten trioxide, titanium dioxide, vanadium oxide, tin dioxide, and nickel oxide (NiO) [4–6]. NiO, a well-known stable p-type semiconducting metal oxide, has a high melting point (1960 ◦C) and excellent chemical stability. It has been extensively employed as electrodes in lithium ion batteries and supercapacitors, as electro-catalysts in combustion gas sensing, and in electrochromic devices [7–9]. Highly porous NiO nanostructures can be used to fabricate highly sensitive gas sensors, especially for NO2 detection, because the p-type semiconducting NiO can effectively donate electrons to the NO2 molecules. TsehnesNin-gd.oTphede NNi-OdonpaendostNruiOctunreanisoshtyrdurcotuthreermisahllyydgrrootwhenrmonaallysilgicroonw/nsiloicnonadsiiolixciodne/(sSilii/cSoinO2d)iwoxaifdeer a(Snid/SgiOol2d) w(Aaufe)realencdtrogdoelds a(Areud)eepleocstirteoddetos amreeadseupreosthiteedelteoctmriceaalssuirgentahlsedeulercintrgicNalOs2igenxaplossduureri.nOgwNinOg2 teoxpthoesuNr-ed. oOpwininggeftfoectht ewNit-hdhoipeirnagrcehfifceacltnwainthoshtrieurcatrucrhei,ctahlenraensoissttarnuccetucrhea,nthgee rinestihsteagnacse scehnasnogrecianntbhee ggraesatsleynasmorplciafinedb. eThgereraetsluyltasmhopwlifsiethda. tTthhee Nre-dsuolptesdhNowiOs-bthasaetdthgeasNse-dnsoopre, dcoNmipOa-rbedasteodagnaosn-sdeonpsoerd, sceonmsopra,reexdhtiobiatsnaotnw-doo-fpoeldd sheignhsoerr,reexshpiobnitssivaittywaon-fdolsdenhsiigtihveirtyretospwoanrsdivNitOy2angadssdenetseictitvioitnyatnodwaisrdthNusOa2 cgaansddiedtaetcetifoonr hanigdhilsytsheunssiaticvaenNdiOd2atseenfosrorhsi.ghly sensitive NO2 sensors
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
