Gas-sensing properties of representative ordered macroporous metal oxide materials. Here, the selectivity value is defined with the sensing response ratio of the target gas to the reference gas, and the stability is evaluated with the declining proportion (%) of sensing response within a specified period (month).

Samples	Template	Pore size (nm)	Temp. (°C)	Target gas	Conc. (ppm)	Gas response	Selectivity value	Stability (%/month)	Res./Rec. time (s)	Ref.
Close-network ZnO	PS spheres	400	25	NO2	50	27.5	213.75 to ethanol	—	35/65	48
Bowl-like ZnO	PS spheres	280	25	NO2	50	4.5	2.25 to ethanol	—	125/210
Ordered SnO2	PS spheres	200	350	Ethanol	3	3.9	1.625 to acetone	−11.8/6	0.73/—	91
Porous LaFeO3	PS spheres	500	450	Ethanol	5	15	3.21 to HCHO	—	6/5	97
2D hollow SnO2	PS spheres	∼1000	300	HCHO	0.5	23	3.67 to CH4	—	1.8/5.4	84
2D porous ZnO	PS spheres	420	300	Acetone	10	17	1.7 to ethanol	−5/6	—/—	85
Ordered SnO2	PS spheres	∼500	350	Ethanol	0.1	1.24	—	—	1/1	92
Bowl-like SnO2	PS spheres	500	300	Ethanol	1	4.3	—	−48/2	2/2	90
α-Fe2O3 IO film	PS spheres	500	400	NO2	5	—	—	−4.2/1	12/—	98
Embossed TiO2	PS beads	1000	250	Ethanol	500	219	4.38 to CO	—	10/—	83
Monolayer Mg–NiO	PS spheres	700	325	Ethanol	100	10.4	6.5 to benzene	−10.6/1	13/19	95
Au–SnO2: 5% In	PMMA spheres	250	275	Ethanol	100	292	41.71 to MeOH	—	7/12	108
Hollow Pt–SnO2	PMMA spheres	800	250	H2	250	4.08	—	—	31/—	86
Ethanol-aged SnO2	PS spheres	500	400	Sarin	0.006	40	1.2 to DMMP	—	—/—	99
Porous In2O3/CuO	PS spheres	450	250	Ethanol	1000	9.6	5.33 to CO	—	48	94
2D Au/In2O3	PS spheres	500	350	Ethanol	5	1640.2	282.79 to HCHO	—	—/—	103
3D IO SnO2	PMMA spheres	400	215	HCHO	100	629	104.83 to ethanol	−6/2	12/58	71
3D IO WO3	PMMA spheres	422.2	370	Acetone	5	7	3.89 to MeOH	—	10/34	76
3DOM Tm–In2O3	PMMA spheres	200	175	Ethanol	100	122	7.63 to acetone	−2.4/1	9/13	118
3DOM Sn–NiO	PMMA spheres	200	225	HCHO	100	145	96.7 to NO2	−2.1/1	30/160	119
3DOM In–ZnO	PMMA spheres	150	250	Ethanol	100	88	1.83 to acetone	—	25/10	113
3DOM Li–WO3	PMMA spheres	∼330	25	NO2	0.5	55	42.31 to NH3	−9.1/1	100/100	120
3DOM Li/K–WO3	PMMA spheres	200	25	NO2	0.5	4.5	4.09 to NH3	—	15/10	138
3DOM Pd/In2O3	PMMA spheres	210	25	NO2	0.5	980	196 to NH3	0/1	270/286	123
3D IO Au/In2O3	PMMA spheres	420	340	Acetone	5	42.4	10.6 to ethanol	—	—/—	117
3DOM Au/In2O3	PMMA spheres	140	230	Ethanol	100	205	6.83 to MeOH	—	15/21	78
3DOM Pd/WO3	PMMA spheres	∼330	130	H2	50	382	191 to HCHO	−1/1	10/50	115
3D IO ZnO–In2O3	PS spheres	170	300	Acetone	100	35.2	25.14 to benzene	−9.1/1	1/—	129
3D IO In2O3–CuO	PMMA spheres	410	370	Acetone	50	39.1	9.5 to ethanol	−2.8/1.3	8/20	124
3DOM ZnO–CuO	PMMA spheres	282	310	Acetone	1	1.8	1.53 to toluene	−11/1	—/—	114
3D IO PdO@In2O3	PS spheres	636.6	250	Acetone	100	50.9	11.31 to C6H6	−11.6/1	—/26	139
3DOM/M LaFeO3	PMMA spheres	191/8–20	190	Methanol	100	96	2.44 to ethanol	—	25/23	140
3DOM/M-SnO2	PS spheres	100/20/3	400	Ethanol	5	316.5	3.50 to ethanol	—	1/416	141
3DOM/M-ZnO	PMMA spheres	600/25	260	Acetone	100	137	—	—	13/50	130
3DOM/M In2O3–ZnO	PS spheres	80/4	25	NO2	5	54.3	6.9 to MeOH	—	586/188	128
3DOM/M Pt–SnO2	Electrosprayed spheres	300/17	250	H2S	1	10.8	—	—	192.4/76.5	142
3DOM/M ZnO–Fe3O4	PMMA spheres	350/30	485	Acetone	50	47	8.44 to C5H12	—	—/—	137