Njengezinzwa zegesi eziziintloko eziqinileyo, i-nano metal oxide semiconductor gas sensors zisetyenziswa ngokubanzi kwimveliso yemizi-mveliso, ukubeka iliso kokusingqongileyo, ukhathalelo lwempilo kunye nezinye iinkalo zobuntununtunu bazo obuphezulu, ixabiso eliphantsi lokuvelisa kunye nokulinganisa umqondiso olula.Okwangoku, uphando malunga nokuphuculwa kweempawu zegesi ze-nano metal oxide sensing materials ikakhulu zijolise ekuphuhliseni i-nanoscale metal oxides, ezifana ne-nanostructure kunye nokuguqulwa kwe-doping.

I-Nano metal oxide semiconductor semiconductor sensing materials ikakhulu i-SnO2, i-ZnO, i-Fe2O3, i-VO2, i-In2O3, i-WO3, i-TiO2, njl.

Okwangoku, ulwalathiso oluphambili lophando kukulungiselela i-nanomaterials ecwangcisiweyo kunye nommandla omkhulu wendawo ethile, njenge-nanotubes, i-nanorod arrays, i-nanoporous membranes, njl njl. kwigesi yemathiriyeli.I-doping ye-elemental ye-oxide yensimbi, okanye ukwakhiwa kwenkqubo ye-nanocomposite, i-dopant eyaziswayo okanye i-composite components inokudlala indima ye-catalytic, kwaye ingaba ngumqhubi oncedisayo wokwakha i-nanostructure, ngaloo ndlela iphucula ukusebenza kwegesi jikelele yokuva. izixhobo.

1. Imathiriyeli yokuva irhasi esetyenzisiweyo iNano Tin Oxide(SnO2)

I-Tin oxide (SnO2) luhlobo lwemathiriyeli ebuthathaka ngokubanzi yerhasi.Inobuntununtunu obuhle kwiigesi ezifana ne-ethanol, i-H2S kunye ne-CO. Ubuzwe bayo begesi buxhomekeke kubukhulu be-particle kunye nommandla othile.Ukulawula ubungakanani be-SnO2 nanopowder ngundoqo ekuphuculeni ukuvakalelwa kwegesi.

Ngokusekwe kwi-mesoporous kunye ne-macroporous nano tin oxide powders, abaphandi balungiselele izinzwa zefilimu ezishinyeneyo ezinomsebenzi ophezulu we-catalytic we-CO oxidation, okuthetha ukuba umsebenzi ophezulu wokuva igesi.Ukongezelela, isakhiwo se-nanoporous siye saba yindawo eshushu ekuyilweni kwezixhobo zokuva igesi ngenxa ye-SSA yayo enkulu, ukusabalalisa kwegesi ecebileyo kunye nemijelo yokudlulisa ubuninzi.

2. Izinto zokuva igesi ezisetyenzisiweyo iNano Iron Oxide(Fe2O3)

I-iron oxide (Fe2O3)ineemo ezimbini zekristale: ialpha kunye negamma, zombini ezinokuthi zisetyenziswe njengezixhobo zokuva igesi, kodwa iipropathi zokuva igesi yazo inomahluko omkhulu.I-α-Fe2O3 iyinxalenye yesakhiwo se-corundum, iipropati zayo ezibonakalayo zizinzile.Indlela yayo yokuva igesi ilawulwa phezulu, kwaye uvakalelo lwayo luphantsi.γ-Fe2O3 yeyesakhiwo spinel kwaye metastable.I-gas sensing mechanism ikakhulu ilawula ukuxhathisa umzimba.Inovakalelo oluhle kodwa uzinzo olubi, kwaye kulula ukuyitshintsha kwi-α-Fe2O3 kunye nokunciphisa uvakalelo lwegesi.

Uphando lwangoku lujolise ekwandiseni iimeko zokudibanisa ukulawula i-morphology ye-Fe2O3 nanoparticles, kwaye emva koko kuhlolwe izinto ezifanelekileyo zegesi-sensitive, ezifana ne-α-Fe2O3 nanobeams, i-porous α-Fe2O3 nanorods, i-monodisperse α-Fe2O3 nanostructures, i-mesopores α-Fe2O3 i-nanomaterials, njl.

3. Izinto zokuva igesi ezisetyenzisiweyo iNano Zinc Oxide(ZnO)
I-Zinc oxide (ZnO)yinto eqhelekileyo elawulwa phantsi kwegesi.I-sensor yegesi esekwe kwi-ZnO inobushushu obuphezulu bokusebenza kunye nokukhetha okungalunganga, okwenza ukuba isetyenziswe kancinci kakhulu kune-SnO2 kunye ne-Fe2O3 nanopowders.Ngoko ke, ukulungiswa kwesakhiwo esitsha se-ZnO nanomaterials, ukuguqulwa kwe-doping ye-nano-ZnO ukunciphisa ukushisa okusebenzayo kunye nokuphucula ukukhetha kugxininiso lophando kwi-nano ZnO izinto zokuva igesi.

Okwangoku, uphuhliso lwe-crystal nano-ZnO enye ye-gas sensing element yenye yeendlela zomda, ezifana ne-ZnO enye ye-crystal nanorod ye-gas sensors.

4. Izinto zokuva igesi ezisetyenzisiweyo iNano Indium Oxide (In2O3)
I-Indidium oxide (In2O3)yimathiriyeli evelayo yohlobo lwe-n-uhlobo lwe-semiconductor yerhasi.Xa kuthelekiswa ne-SnO2, i-ZnO, i-Fe2O3, njl., ine-gap yebhendi ebanzi, i-resistiveivity encinci kunye nomsebenzi ophezulu we-catalytic, kunye novakalelo oluphezulu kwi-CO kunye ne-NO2.Ama-nanomaterials ane-Porous amelwe yi-nano In2O3 yenye yee-hotspots zophando zakutsha nje.Abaphandi baye badibanisa izinto ezi-mesoporous ze-In2O3 nge-mesoporous silica template replication.Izinto ezifunyenweyo zinozinzo oluhle kwi-450-650 ° C, ngoko zifanelekile kwiinzwa zegesi ezinokushisa okuphezulu kokusebenza.Zinobuntununtunu kwi-methane kwaye zingasetyenziselwa ukujonga okunxulumene nogqabhuko-dubulo.

5. Izinto zokuva igesi ezisetyenzisiweyo iNano Tungsten Oxide (WO3)
WO3 nanoparticlesyimathiriyeli yenguqu yentsimbi ekhompawundiweyo yesemiconductor eye yafundwa ngokubanzi yaza yasetyenziswa kwipropathi yayo elungileyo yokuva igesi.I-Nano WO3 inezakhiwo ezizinzileyo ezifana ne-triclinic, i-monoclinic kunye ne-orthorhombic.Abaphandi balungiselela i-WO3 nanoparticles ngendlela ye-nano-casting usebenzisa i-mesoporous SiO2 njenge template.Kwafunyaniswa ukuba i-monoclinic WO3 nanoparticles kunye nobukhulu obuphakathi kwe-5 nm inomsebenzi ongcono wokuva igesi, kwaye izibini zenzwa ezifunyenwe nge-electrophoretic deposition ye-WO3 nanoparticles Uxinzelelo oluphantsi lwe-NO2 lunempendulo ephezulu.

Ukusabalalisa okulinganayo kwesigaba se-hexagonal i-WO3 nanoclusters yenziwe nge-ion exchange-hydrothermal method.Iziphumo zokuvavanya ukuvakalelwa kwegesi zibonisa ukuba i-WO3 i-nanoclustered gas sensor ineqondo lokushisa eliphantsi eliphantsi, uvakalelo oluphezulu kwi-acetone kunye ne-trimethylamine kunye nexesha elifanelekileyo lokubuyisela impendulo, ebonisa ithemba elihle lesicelo sezinto eziphathekayo.

6. Izinto zokuva igesi ezisetyenzisiweyo iNano Titanium Dioxide(TiO2)
I-Titanium dioxide (TiO2)izinto zokuva igesi zineenzuzo zokuzinza okuhle kwe-thermal kunye nenkqubo yokulungiselela elula, kwaye ngokuthe ngcembe ibe yenye into eshushu kubaphandi.Okwangoku, uphando kwi-nano-TiO2 inzwa yegesi igxile kwi-nanostructure kunye nokusebenza kwezixhobo zokuva i-TiO2 ngokusebenzisa i-nanotechnology ekhulayo.Ngokomzekelo, abaphandi baye benza i-micro-nano-scale hollow TiO2 fibers ngeteknoloji ye-coaxial electrospinning.Ukusebenzisa itekhnoloji yelangatye exutyiweyo emileyo, i-electrode yomnqamlezo ibekwe ngokuphindaphindiweyo kwidangatye elixubeneyo elixubeneyo kunye ne-titanium tetraisopropoxide njenge-precursor, kwaye emva koko ikhule ngokuthe ngqo ukwenza i-porous inwebu kunye ne-nanoparticles ye-TiO2, esabelayo kwi-CO. Ngaxeshanye ikhula i-TiO2 eyalelweyo. i-nanotube array nge-anodization kwaye isetyenziswe ekubhaqweni kwe-SO2.

7. I-Nano oxide composites yezinto ezizivayo zegesi
Iimpawu zokuva igesi ze-nano metal oxides powders sensing materials zingaphuculwa nge-doping, engalungiseleli kuphela umbane wezinto eziphathekayo, kodwa iphucula ukuzinza kunye nokukhetha.I-Doping yezinto ezixabisekileyo zetsimbi yindlela eqhelekileyo, kwaye izinto ezifana ne-Au kunye ne-Ag zihlala zisetyenziswa njenge-dopants ukuphucula ukusebenza kwegesi ye-nano zinc oxide powder.I-Nano oxide composite i-gas sensing materials iquka ikakhulu i-Pd doped SnO2, i-Pt-doped γ-Fe2O3, kunye ne-multi-element eyongeziweyo kwi-In2O3 i-hollow sphere sensing material, enokuthi iqondwe ngokulawula izongezo kunye nobushushu bokuva ukuqonda ukuchongwa okukhethiweyo kwe-NH3, H2S kunye ne-CO. Ukongeza, ifilimu ye-WO3 ye-nano iguqulwe ngoluhlu lwe-V2O5 ukuphucula i-porous surface structure yefilimu ye-WO3, ngaloo ndlela iphucula ukuvakalelwa kwayo kwi-NO2.

Okwangoku, ii-graphene / nano-metal oxide composite ziye zaba yindawo eshushu kwizixhobo ze-gas sensor.I-Graphene/SnO2 nanocomposites isetyenziswe ngokubanzi njengokubonwa kwe-ammonia kunye nezixhobo zokuva i-NO2.