Raws li cov khoom siv hluav taws xob tseem ceeb hauv lub xeev, nano hlau oxide semiconductor gas sensors tau siv dav hauv kev tsim khoom, kev saib xyuas ib puag ncig, kev saib xyuas kev noj qab haus huv thiab lwm yam kev lag luam rau lawv cov rhiab heev, tsis tshua muaj nqi tsim khoom thiab ntsuas cov teeb liab yooj yim.Tam sim no, kev tshawb fawb txog kev txhim kho cov roj sensing zog ntawm nano hlau oxide sensing cov ntaub ntawv feem ntau tsom rau kev txhim kho nanoscale hlau oxides, xws li nanostructure thiab doping hloov.

Nano hlau oxide semiconductor sensing cov ntaub ntawv feem ntau yog SnO2, ZnO, Fe2O3, VO2, In2O3, WO3, TiO2, thiab lwm yam. Cov khoom siv sensor tseem yog cov khoom siv hluav taws xob zoo tshaj plaws, cov khoom siv hluav taws xob tsis zoo kuj tau tsim sai dua.

Tam sim no, txoj kev tshawb fawb tseem ceeb yog los npaj cov khoom siv nanomaterials nrog thaj tsam loj, xws li nanotubes, nanorod arrays, nanoporous membranes, thiab lwm yam kom nce cov roj adsorption muaj peev xwm thiab cov roj diffusion tus nqi, thiab yog li txhim kho rhiab heev thiab ceev cov lus teb. rau cov khoom siv roj.Lub hauv paus doping ntawm cov hlau oxide, los yog kev tsim kho ntawm nanocomposite system, lub tswv yim dopant los yog composite Cheebtsam tuaj yeem ua lub luag haujlwm catalytic, thiab tseem tuaj yeem dhau los ua tus pabcuam pabcuam rau kev tsim cov nanostructure, yog li txhim kho tag nrho cov pa sensing kev ua tau zoo ntawm kev hnov. cov ntaub ntawv.

1. Gas sensing cov ntaub ntawv siv Nano Tin Oxide (SnO2)

Tin oxide (SnO2) yog ib yam ntawm cov khoom rhiab heev gas rhiab heev.Nws muaj qhov zoo rhiab heev rau cov pa roj xws li ethanol, H2S thiab CO. Nws cov roj rhiab heev nyob ntawm seb qhov loj me thiab thaj chaw tshwj xeeb.Kev tswj qhov loj ntawm SnO2 nanopowder yog tus yuam sij rau kev txhim kho roj rhiab heev.

Raws li mesoporous thiab macroporous nano tin oxide hmoov, cov kws tshawb fawb tau npaj cov yeeb yaj kiab tuab uas muaj cov haujlwm catalytic ntau dua rau CO oxidation, uas txhais tau tias muaj roj ntau dua.Tsis tas li ntawd, cov qauv nanoporous tau dhau los ua qhov chaw kub hauv kev tsim cov khoom siv hluav taws xob vim nws qhov loj SSA, cov roj nplua nuj diffusion thiab kev hloov pauv loj.

2. Gas sensing cov ntaub ntawv siv Nano Iron Oxide (Fe2O3)

Hlau oxide (Fe2O3)muaj ob daim ntawv siv lead ua: alpha thiab gamma, ob qho tib si tuaj yeem siv los ua cov khoom siv roj, tab sis cov khoom siv roj ntawm lawv muaj qhov sib txawv loj.α-Fe2O3 belongs rau corundum qauv, nws lub cev muaj zog ruaj khov.Nws cov roj sensing mechanism yog nto tswj, thiab nws rhiab heev yog tsawg.γ-Fe2O3 belongs rau spinel qauv thiab yog metastable.Nws cov roj sensing mechanism yog feem ntau lub cev tsis kam tswj.Nws muaj qhov zoo rhiab heev tab sis tsis muaj kev ruaj ntseg, thiab yooj yim hloov mus rau α-Fe2O3 thiab txo cov roj rhiab heev.

Kev tshawb fawb tam sim no tsom rau kev ua kom zoo dua cov kev sib txuas los tswj cov morphology ntawm Fe2O3 nanoparticles, thiab tom qab ntawd tshuaj ntsuam rau cov khoom siv roj-sensitive, xws li α-Fe2O3 nanobeams, ntxeem tau α-Fe2O3 nanorods, monodisperse α-Fe2O3 nanostructures, mesopores α-Fe2O3 nanostructures. nanomaterials, thiab lwm yam.

3. Gas sensing cov ntaub ntawv siv Nano Zinc Oxide (ZnO)
Zinc oxide (ZnO)yog ib yam khoom nto-tswj roj-rhiab heev.ZnO-based gas sensor muaj qhov kub thiab txias ua haujlwm tsis zoo, ua rau nws tsis tshua siv ntau dua li SnO2 thiab Fe2O3 nanopowders.Yog li ntawd, kev npaj cov qauv tshiab ntawm ZnO nanomaterials, doping kev hloov kho ntawm nano-ZnO kom txo kev khiav hauj lwm kub thiab txhim kho kev xaiv yog lub hom phiaj ntawm kev tshawb fawb ntawm nano ZnO roj sensing cov ntaub ntawv.

Tam sim no, txoj kev loj hlob ntawm ib leeg siv lead ua nano-ZnO roj sensing caij yog ib qho ntawm cov kev taw qhia pem hauv ntej, xws li ZnO ib leeg siv lead ua nanorod gas sensors.

4. Gas sensing cov ntaub ntawv siv Nano Indium Oxide (In2O3)
Indium oxide (In2O3)yog n-hom semiconductor gas sensing khoom.Piv nrog rau SnO2, ZnO, Fe2O3, thiab lwm yam, nws muaj qhov sib txawv ntawm qhov sib txawv, me me resistivity thiab siab catalytic kev ua si, thiab siab rhiab heev rau CO thiab NO2.Porous nanomaterials sawv cev los ntawm nano In2O3 yog ib qho ntawm cov kev tshawb fawb tsis ntev los no.Cov kws tshawb fawb tau tsim cov khoom siv mesoporous In2O3 los ntawm kev siv mesoporous silica template replication.Cov ntaub ntawv tau txais muaj kev ruaj ntseg zoo nyob rau hauv thaj tsam ntawm 450-650 ° C, yog li lawv tsim nyog rau cov roj sensors nrog kev ua haujlwm siab dua.Lawv yog cov rhiab heev rau methane thiab tuaj yeem siv rau kev soj ntsuam txog kev tawg.

5. Gas sensing cov ntaub ntawv siv Nano Tungsten Oxide (WO3)
WO 3 nanoparticlesyog ib qho kev hloov pauv hlau sib txuas cov khoom siv semiconductor uas tau kawm dav thiab thov rau nws cov khoom siv roj zoo.Nano WO3 muaj cov qauv ruaj khov xws li triclinic, monoclinic thiab orthorhombic.Cov kws tshawb fawb tau npaj WO3 nanoparticles los ntawm nano-casting txoj kev siv mesoporous SiO2 ua qauv.Nws tau pom tias monoclinic WO3 nanoparticles nrog qhov nruab nrab qhov loj ntawm 5 nm muaj qhov ua tau zoo ntawm cov pa sensing, thiab cov sensor khub tau txais los ntawm electrophoretic deposition ntawm WO3 nanoparticles Tsawg concentrations ntawm NO2 muaj cov lus teb siab.

Kev faib ua homogeneous ntawm hexagonal theem WO3 nanoclusters tau tsim los ntawm ion exchange-hydrothermal method.Cov txiaj ntsig ntawm kev ntsuas roj rhiab heev qhia tau hais tias WO3 nanoclustered gas sensor muaj qhov kub thiab txias, siab rhiab heev rau acetone thiab trimethylamine thiab lub sijhawm teb zoo tshaj plaws, nthuav tawm cov ntawv thov zoo ntawm cov khoom siv.

6. Gas sensing cov ntaub ntawv siv Nano Titanium Dioxide (TiO2)
Titanium dioxide (TiO2)Gas sensing cov ntaub ntawv muaj qhov zoo ntawm thermal stability zoo thiab cov txheej txheem kev npaj yooj yim, thiab tau maj mam dhau los ua lwm yam khoom kub rau cov kws tshawb fawb.Tam sim no, kev tshawb fawb ntawm nano-TiO2 roj sensor tsom rau nanostructure thiab functionalization ntawm TiO2 sensing cov ntaub ntawv los ntawm kev siv nanotechnology tshwm sim.Piv txwv li, cov kws tshawb fawb tau ua micro-nano-scale hollow TiO2 fibers los ntawm coaxial electrospinning technology.Siv lub tshuab hluav taws xob premixed stagnant nplaim hluav taws xob, tus ntoo khaub lig electrode rov qab muab tso rau hauv cov nplaim hluav taws kub hnyiab nrog titanium tetraisopropoxide ua cov khoom ua ntej, thiab tom qab ntawd ncaj qha cog rau hauv daim nyias nyias nrog TiO2 nanoparticles, uas yog cov lus teb rau CO. nanotube array los ntawm anodization thiab siv nws rau kev kuaj pom ntawm SO2.

7. Nano oxide composites rau cov khoom siv roj
Cov roj sensing zog ntawm nano hlau oxides hmoov sensing cov ntaub ntawv tuaj yeem txhim kho los ntawm doping, uas tsis tsuas yog kho cov hluav taws xob conductivity ntawm cov khoom, tab sis kuj txhim kho kev ruaj ntseg thiab kev xaiv.Doping ntawm cov ntsiab lus hlau muaj nuj nqis yog ib txoj hauv kev, thiab cov ntsiab lus xws li Au thiab Ag feem ntau yog siv los ua dopants los txhim kho cov roj sensing kev ua tau zoo ntawm nano zinc oxide hmoov.Nano oxide composite gas sensing cov ntaub ntawv feem ntau suav nrog Pd doped SnO2, Pt-doped γ-Fe2O3, thiab ntau lub ntsiab ntxiv In2O3 hollow sphere sensing khoom, uas tuaj yeem paub los ntawm kev tswj cov khoom siv ntxiv thiab ntsuas kub kom paub txog kev xaiv xaiv ntawm NH3, H2S thiab CO . Tsis tas li ntawd, WO3 nano zaj duab xis tau hloov kho nrog txheej txheej ntawm V2O5 los txhim kho cov txheej txheem ntawm lub ntsej muag ntxeem tau ntawm WO3 zaj duab xis, yog li txhim kho nws qhov rhiab heev rau NO2.

Tam sim no, graphene / nano-hlau oxide composites tau dhau los ua qhov kub ntawm cov khoom siv roj.Graphene / SnO2 nanocomposites tau dav siv los ua ammonia nrhiav thiab NO2 sensing cov ntaub ntawv.