Sezvinoita main solid-state gasi sensors, nano simbi oxide semiconductor gasi sensors anoshandiswa zvakanyanya mukugadzirwa kwemaindasitiri, kutarisa kwezvakatipoteredza, hutano hwehutano uye mimwe minda yekunzwa kwavo kwepamusoro, mutengo wakaderera wekugadzira uye kuyerwa kwechiratidzo.Parizvino, tsvakiridzo pamusoro pekuvandudzwa kwegasi inonzwa zvimiro zve nano metal oxide sensing zvinhu zvinonyanya kutarisisa kugadzirwa kwenanoscale metal oxides, senge nanostructure uye doping modification.

Nano metal oxide semiconductor sensing materials inonyanya kunzi SnO2, ZnO, Fe2O3, VO2, In2O3, WO3, TiO2, nezvimwewo. Zvikamu zvinonzwa zvichiri kunyanya kushandiswa zvakanyanya resistive gas sensors, non-resistive gases sensors ari kuvandudzwa nokukurumidza.

Parizvino, iyo huru yekutsvagisa dhairekitori ndeyekugadzirira yakarongeka nanomaterials ine yakakura chaiyo nzvimbo, senge nanotubes, nanorod arrays, nanoporous membranes, nezvimwewo kuwedzera gasi adsorption chiyero uye gasi diffusion rate, uye nekudaro kuvandudza kunzwisisika uye kumhanya kwekupindura. kune gasi rezvinhu.Iyo elemental doping yesimbi oxide, kana kuvakwa kweiyo nanocomposite system, iyo yakaunzwa dopant kana inoumbwa zvikamu zvinogona kuita basa rinokurudzira, uye zvakare inogona kuve yekubatsira mutakuri wekuvaka iyo nanostructure, nekudaro ichivandudza iyo yakazara gasi kunzwa kuita kwekunzwa. zvinhu.

1. Gasi rinonzwa zvinhu zvakashandiswa Nano Tin Oxide(SnO2)

Tin oxide (SnO2) imhando yezvakajairwa zvinonzwa gasi zvinhu.Iine kunzwisiswa kwakanaka kumagasi akadai se ethanol, H2S uye CO. Kunzwa kwayo gasi kunoenderana nehukuru hwechikamu uye nzvimbo chaiyo.Kudzora saizi yeSnO2 nanopowder ndiyo kiyi yekuvandudza gasi kunzwa.

Kubva pane mesoporous uye macroporous nano tin oxide poda, vaongorori vakagadzira makobvu-firimu masensa ane yakakwirira catalytic chiitiko cheCO oxidation, zvinoreva yakakwirira gasi kunzwa chiitiko.Pamusoro pezvo, iyo nanoporous dhizaini yave nzvimbo inopisa mukugadzirwa kwezvinhu zvinonzwa gasi nekuda kweiyo SSA yakakura, yakapfuma gasi diffusion uye nzira dzekufambisa dzakawanda.

2. Gasi sensing zvinhu zvakashandiswa Nano Iron Oxide(Fe2O3)

Iron oxide (Fe2O3)ine mafomu maviri ekristaro: alpha negamma, ose anogona kushandiswa semidziyo inonzwa gasi, asi gasi inonzwa maitiro ayo ane misiyano mikuru.α-Fe2O3 ndeye corundum chimiro, icho chimiro chemuviri chakagadzikana.Iyo gasi inonzwa mechanic inodzorwa pamusoro, uye kunzwa kwayo kwakadzikira.γ-Fe2O3 ndeye spinel chimiro uye ine metastable.Yayo gasi inonzwa maitiro inonyanya kupikisa muviri kutonga.Iine kunzwisiswa kwakanaka asi kugadzikana kusina kunaka, uye iri nyore kuchinja ku α-Fe2O3 uye kuderedza gasi kunzwa.

Tsvagiridzo yazvino inotarisana nekugadzirisa mamiriro ekutanga ekudzora morphology yeFe2O3 nanoparticles, uyezve kuongorora kune yakakodzera gasi-sensinsi zvinhu, senge α-Fe2O3 nanobeams, porous α-Fe2O3 nanorods, monodisperse α-Fe2O3 nanostructures, mesopores α-Fe2O3 Nanomaterials, etc.

3. Gasi sensing zvinhu zvakashandiswa Nano Zinc Oxide(ZnO)
Zinc oxide (ZnO)chinhu chakajairika pamusoro-inodzorwa negasi-sensitive material.Iyo ZnO-yakavakirwa gasi sensor ine yakanyanya tembiricha yekushandisa uye kusarudzika kwakashata, zvichiita kuti isanyanya kushandiswa zvakanyanya kupfuura SnO2 uye Fe2O3 nanopowders.Naizvozvo, kugadzirira kwechimiro chitsva cheZnO nanomaterials, doping modification ye nano-ZnO kuderedza tembiricha yekushanda uye kuvandudza kusarudzwa ndiko kutarisisa kwetsvakiridzo pane nano ZnO gasi inonzwa zvinhu.

Parizvino, kuvandudzwa kwekristaro imwe chete nano-ZnO gasi inonzwa chinhu chimwe chemiganhu yemiganhu, yakadai seZnO single crystal nanorod gas sensors.

4. Gasi sensing zvinhu zvakashandiswa Nano Indium Oxide(In2O3)
Indium oxide (In2O3)iri kubuda n-mhando semiconductor gasi inonzwa zvinhu.Kuenzaniswa neSnO2, ZnO, Fe2O3, nezvimwewo, ine gap rakakura rebhendi, diki resitirizi uye yakakwirira catalytic chiitiko, uye yakanyanya kunzwisiswa kuCO uye NO2.Porous nanomaterials inomiririrwa nano In2O3 ndeimwe yeazvino tsvagiridzo hotspots.Vatsvagiri vakagadzira akaodha mesoporous In2O3 zvinhu nenzira yemesoporous silica template replication.Zvinhu zvakawanikwa zvine kugadzikana kwakanaka mukati me450-650 ° C, saka zvakakodzerwa nema sensors egasi ane tembiricha yepamusoro yekushandisa.Idzo dzinonzwa kune methane uye dzinogona kushandiswa kutarisisa-zvine chekuita nekuputika kwekutarisa.

5. Gasi sensing zvinhu zvakashandiswa Nano Tungsten Oxide(WO3)
WO3 nanoparticlesishanduko yesimbi inosanganisirwa semiconductor zvinhu izvo zvakadzidzwa zvakanyanya uye kushandiswa kune yayo yakanaka gasi inonzwa.Nano WO3 ine zvimiro zvakagadzikana senge triclinic, monoclinic uye orthorhombic.Vatsvakurudzi vakagadzirira WO3 nanoparticles ne nano-casting nzira vachishandisa mesoporous SiO2 se template.Yakawanikwa kuti monoclinic WO3 nanoparticles ine avhareji saizi ye5 nm ine zvirinani gasi sensing performance, uye sensor pairs inowanikwa ne electrophoretic deposition yeWO3 nanoparticles Low concentrations yeNO2 ine mhinduro yakakwirira.

Iyo homogeneous kugovera kwehexagonal chikamu WO3 nanoclusters yakagadzirwa neion exchange-hydrothermal nzira.Iyo gasi senitivity test mhinduro inoratidza kuti iyo WO3 nanoclustered gasi sensor ine yakaderera yekushanda tembiricha, yakakwirira senitivity kune acetone uye trimethylamine uye yakanaka yekupindura yekudzoreredza nguva, ichiratidza yakanaka application tarisiro yezvinhu.

6. Gasi sensing zvinhu zvakashandiswa Nano Titanium Dioxide(TiO2)
Titanium dioxide (TiO2)gasi sensing zvinhu zvine zvakanakira kugadzikana kwekupisa uye nyore kugadzirira maitiro, uye zvishoma nezvishoma zvave zvimwe zvinopisa zvinhu zvevanoongorora.Parizvino, tsvagiridzo ye nano-TiO2 gasi sensor inotarisa pane nanostructure uye kushanda kweTiO2 sensing zvinhu nekushandisa iri kubuda nanotechnology.Semuenzaniso, vaongorori vakagadzira micro-nano-scale hollow TiO2 fibers necoaxial electrospinning tekinoroji.Uchishandisa premixed stagnant flame technology, the cross electrode inodzokororwa kuiswa mune premixed stagnant flami with titanium tetraisopropoxide as the precursor, uye yobva yakura zvakananga kuita he porous membrane ine TiO2 nanoparticles, inova inonzwira ku CO. Panguva imwe chete inokura yakarairwa TiO2 nanotube array neanodization uye inoishandisa pakuonekwa kweSO2.

7. Nano oxide composites yezvinhu zvinonzwa gasi
Iyo gasi inonzwa zvinhu zve nano metal oxides powders sensing materials inogona kuvandudzwa ne doping, iyo isingagadzirisi chete magetsi ekugadzirisa zvinhu, asiwo inovandudza kugadzikana uye kusarudza.Doping yezvinhu zvakakosha zvesimbi inzira yakajairika, uye zvinhu zvakaita seAu neAg zvinowanzo shandiswa sema dopants kugadzirisa gasi kunzwa kuita kwe nano zinc oxide poda.Nano oxide composite gasi inonzwa zvinhu zvinonyanya zvinosanganisira Pd doped SnO2, Pt-doped γ-Fe2O3, uye akawanda-element akawedzera In2O3 hollow sphere sensing zvinhu, izvo zvinogona kuonekwa nekudzora zvinowedzera uye tembiricha yekunzwa kuti uone kusarudzwa kweNH3, H2S uye CO. Uye zvakare, WO3 nano firimu inogadziridzwa neyakagadzika yeV2O5 kuti ivandudze porous pamusoro peiyo WO3 firimu, nekudaro ichivandudza kunzwisiswa kwayo kuNO2.

Parizvino, graphene/nano-metal oxide composite yave hotspot mune gasi sensor zvinhu.Graphene/SnO2 nanocomposites yakashandiswa zvakanyanya sekuona ammonia uye NO2 sensing materials.