Dị ka isi ihe mmetụta gas siri ike, nano metal oxide semiconductor gas sensọ na-ejikarị eme ihe na mmepụta ụlọ ọrụ, nlekota gburugburu ebe obibi, nlekọta ahụike na mpaghara ndị ọzọ maka nghọta ha dị elu, ọnụ ahịa nrụpụta dị ala na nha mgbaàmà dị mfe.Ka ọ dị ugbu a, nyocha maka mmelite nke ihe mmetụta gas nke nano metal oxide ihe mmetụta na-elekwasị anya na mmepe nke nanoscale metal oxides, dị ka nanostructure na mgbanwe doping.

Nano metal oxide semiconductor sensing ihe bụ tumadi SnO2, ZnO, Fe2O3, VO2, In2O3, WO3, TiO2, wdg The sensọ components ka bụ ndị kasị n'ọtụtụ ebe resistive gas sensọ, na-abụghị ndị na-eguzogide gas sensọ na-na-mepụtara ngwa ngwa.

Ka ọ dị ugbu a, ntụzịaka nyocha bụ isi bụ ịkwadebe nanomaterials ahaziri ahazi nke nwere nnukwu mpaghara dị iche iche, dị ka nanotubes, nanorod arrays, nanoporous membranes, wdg iji mee ka ikike mgbasa ozi gas na ọnụego mgbasa gas dịkwuo elu, wee si otú ahụ meziwanye nghọta na ọsọ nke nzaghachi. ka gas nke ihe.Doping elemental nke metal oxide, ma ọ bụ iwu nke nanocomposite sistemu, dopant ewepụtara ma ọ bụ ihe mejupụtara nwere ike rụọ ọrụ dị egwu, ma nwee ike bụrụ onye na-ebu enyemaka maka iwu nanostructure, si otú ahụ na-emeziwanye arụmọrụ nhụta gas zuru oke nke nghọta. ihe.

1. Ihe ndị na-achọpụta gas ejiri Nano Tin Oxide (SnO2) mee ihe.

Tin oxide (SnO2) bụ ụdị ihe na-emetụ gas n'ozuzu.Ọ nwere ezi uche na gas dị ka ethanol, H2S na CO. Ya gas uche na-adabere na urughuru size na kpọmkwem elu ebe.Ịchịkwa nha nke SnO2 nanopowder bụ isi ihe na-eme ka mmetụta gas dịkwuo mma.

Dabere na mesoporous na macroporous nano tin oxide powders, ndị nchọpụta ahụ kwadebere ihe mmetụta ihe nkiri dị egwu nke nwere ọrụ catalytic dị elu maka CO oxidation, nke pụtara ọrụ mmetụta gas dị elu.Tụkwasị na nke ahụ, usoro nanoporous aghọwo ebe na-ekpo ọkụ na nhazi nke ihe ndị na-ahụ maka gas n'ihi nnukwu SSA ya, mgbasa ozi gas bara ụba na ọwa mbufe oke.

2. Ihe na-achọpụta gas ejiri Nano Iron Oxide (Fe2O3)

Ígwè oxide (Fe2O3)nwere ụdị kristal abụọ: alfa na gamma, nke abụọ nwere ike iji dị ka ihe na-ahụ maka gas, mana njirimara gas nke ha nwere nnukwu ọdịiche.α-Fe2O3 bụ nke corundum nhazi, nke ihe anụ ahụ ya kwụsiri ike.A na-achịkwa usoro nyocha gas ya n'elu, na mmetụta ya dị ala.γ-Fe2O3 bụ nke usoro ọkpụkpụ azụ ma bụrụ metastable.Usoro nhụta gas ya bụ njikwa nguzogide anụ ahụ. Ọ nwere ezi uche mana nkwụsi ike na-adịghị mma, ọ dịkwa mfe ịgbanwe na α-Fe2O3 ma belata mmetụta gas.

Nnyocha a na-eme ugbu a na-elekwasị anya n'ịkwalite ọnọdụ njikọ iji chịkwaa morphology nke Fe2O3 nanoparticles, wee nyochaa maka ihe ndị nwere mmetụta gas dị mma, dị ka α-Fe2O3 nanobeams, porous α-Fe2O3 nanorods, monodisperse α-Fe2O3 nanostructures, α-Fe2O3 nanostructures, α-Fe2O3 nanostructures, α-Fe2O3. nanomaterials, wdg.

3. Ihe nleba anya gas ejiri Nano Zinc Oxide (ZnO) mee ihe.
Zinc oxide (ZnO)bụ ihe a na-ahụkarị nke ikuku na-achịkwa elu.Ihe mmetụta gas dabere na ZnO nwere okpomọkụ na-arụ ọrụ dị elu yana nhọrọ adịghị mma, na-eme ka ọ dị obere ka ejiri ya karịa SnO2 na Fe2O3 nanopowders.Ya mere, nkwadebe nke ọhụrụ Ọdịdị nke ZnO nanomaterials, doping mgbanwe nke nano-ZnO iji belata arụ ọrụ okpomọkụ ma melite selectivity bụ na-elekwasị anya nke nnyocha na nano ZnO gas mmetụta ihe.

Ka ọ dị ugbu a, mmepe nke otu kristal nano-ZnO gas sensing element bụ otu n'ime ntụzịaka dị n'ihu, dị ka ihe mmetụta ZnO otu kristal nanorod gas.

4. Ihe nleba anya gas ejiri Nano Indium Oxide (In2O3)
Indium oxide (In2O3)bụ ihe n-ụdị n-ụdị semiconductor gas na-achọpụta ihe.E jiri ya tụnyere SnO2, ZnO, Fe2O3, wdg, ọ nwere ọdịiche dị ukwuu nke band, obere resistivity na nnukwu ọrụ catalytic, yana nnukwu uche na CO na NO2.Nanomaterials nwere oghere nke nano In2O3 nọchiri anya ya bụ otu n'ime ebe nyocha na nso nso a.Ndị nyocha ahụ rụpụtara ihe In2O3 mesoporous nyere iwu site na ndebiri silica mesoporous.Ihe ndị a nwetara nwere nkwụsi ike dị mma na nso 450-650 Celsius, n'ihi ya, ha dị mma maka ihe mmetụta gas na okpomọkụ na-arụ ọrụ dị elu.Ha na-enwe mmetụta nke methane ma enwere ike iji ya mee nyocha mgbawa metụtara itinye uche.

5. Ihe na-ahụ maka gas na-eji Nano Tungsten Oxide (WO3)
WO3 nanoparticlesbụ ihe ngbanwe metal compound semiconductor ihe nke a mụọla nke ọma ma tinye ya n'ọrụ maka ezigbo ihe nhụta gas.Nano WO3 nwere ụlọ kwụsiri ike dị ka triclinic, monoclinic na orthorhombic.Ndị nchọpụta ahụ kwadebere WO3 nanoparticles site na usoro nkedo nano site na iji mesoporous SiO2 dị ka template.Achọpụtara na monoclinic WO3 nanoparticles nwere nkezi nha nke 5 nm nwere arụmọrụ mmetụta gas ka mma, yana ụzọ abụọ mmetụta nke enwetara site na ntinye electrophoretic nke WO3 nanoparticles obere mkpokọta NO2 nwere nzaghachi dị elu.

Ejiri usoro mgbanwe ion-hydrothermal mekọrịtara nkesa nke hexagonal WO3 nanoclusters.Nsonaazụ nyocha nke gas na-egosi na WO3 nanoclustered gas sensor nwere obere okpomọkụ na-arụ ọrụ, mmetụta dị elu na acetone na trimethylamine na oge nzaghachi nzaghachi dị mma, na-ekpughe ezigbo atụmanya ngwa nke ihe ahụ.

6. Ihe na-achọpụta gas ejiri Nano Titanium Dioxide (TiO2) mee ihe.
Titanium dioxide (TiO2)Ihe na-ahụ maka gas nwere uru nke nkwụsi ike dị mma na usoro nkwadebe dị mfe, ma jiri nwayọọ nwayọọ ghọọ ihe ọzọ na-ekpo ọkụ maka ndị nchọpụta.Ka ọ dị ugbu a, nyocha na nano-TiO2 gas sensọ na-elekwasị anya na nanostructure na ịrụ ọrụ nke ihe mmetụta TiO2 site na iji nanotechnology na-apụta.Dịka ọmụmaatụ, ndị nchọpụta emewo eriri TiO2 oghere micro-nano site na teknụzụ coaxial electrospinning.Iji premixed stagnant ire technology, cross electrode na-ugboro ugboro enịm ke premixed stagnant ire ọkụ na titanium tetraisopropoxide dị ka precursor, na mgbe ahụ kpọmkwem toro na-etolite ọ porous akpụkpọ ahụ na TiO2 nanoparticles, nke bụ mwute nzaghachi CO. N'out oge na-eto eto nyere iwu TiO2. nanotube array site na anodization ma tinye ya na nchọpụta SO2.

7. Nano oxide composites maka gas na-achọpụta ihe
Enwere ike imeziwanye ihe na-ahụ maka gas nke nano metal oxides powders ihe na-achọpụta ihe site na doping, nke ọ bụghị naanị na-edozi ihe eletriki eletrik nke ihe ahụ, kamakwa na-eme ka nkwụsi ike na selectivity dịkwuo mma.Doping nke metal dị oké ọnụ ahịa bụ usoro a na-ahụkarị, a na-ejikarị ihe ndị dị ka Au na Ag eme ihe dị ka dopants iji melite arụmọrụ nhụta gas nke nano zinc oxide ntụ ntụ.Nano oxide mejupụtara gas sensọ ihe tumadi gụnyere Pd doped SnO2, Pt-doped γ-Fe2O3, na multi-element gbakwunyere In2O3 oghere oghere ihe ihe mmetụta, nke nwere ike mezuo site na ịchịkwa ihe mgbakwunye na ịhụ okpomọkụ iji nweta nhọpụta nke NH3, H2S na CO. Na mgbakwunye, WO3 nano ihe nkiri na-agbanwe na oyi akwa nke V2O5 iji melite porous n'elu Ọdịdị nke WO3 film, si otú ime ka ya uche na NO2.

Ka ọ dị ugbu a, graphene/nano-metal oxide composites aghọwo ebe na-ekpo ọkụ na ihe mmetụta gas.A na-eji Graphene/SnO2 nanocomposites mee ihe n'ọtụtụ ebe dị ka nchọpụta amonia na ihe mmetụta NO2.