Supporting Information
Detection of NOx down to ppb levels at room temperature
based on highly mesoporous hierarchical Ni(OH)2-In(OH)3
double hydroxide composites
Jingchao Wanga, Linlin Wanga, Jun Gaoa, Ling Zhoua, Yunlong Gea, Liqiang Jinga,
Keying Shia* and Li Lia,b*
a. Key Laboratory of Functional Inorganic Material Chemistry, Ministry of
Education, School of Chemistry and Materials Science, Heilongjiang University,
Harbin, 150080, P. R. China.
b. Key Laboratory of Chemical Engineering Process & Technology for
High-efficiency Conversion, School of Chemistry and Materials Science, Heilongjiang
University, Harbin 150080, P. R. China
*Corresponding author. Tel.: +86 451 86609141; +86 451 86604920
E-mail address: shikeying2008@163.com; llwjjhlju@sina.cn.
Figure captions
Fig. S1 The FT-IR spectra of the pure α-Ni(OH)2
Fig. S2 TEM image of different selected-area of NIDH-30 showing porous assemble
of α-Ni(OH)2 and In(OH)3 nanoparticles.
Fig. S3 SEM images of NIDHs synthesized for different refluxl time (a) 1 h, (b) 2 h,
(c) 3 h and (d) 5 h
Fig. S4 Schematic illustration of the formation mechanism of NIDHs with highly
mesoporous hierarchical nanostructures.
Fig. S5 Mott-Schottky plots of pure In(OH)3 electrodes in 1 M KOH electrolyte
measured at afrequencyof 1 kHz.
Table S1 The data of FT-IR spectrum for the samples
Table S2 Gas response results of NIDH-30 sensor to NOx at room temperature in air
(RH: 26%)
Fig.S1
Fig.S2
Fig.S3
Fig.S4
Fig.S5
Table S1 The data of FT-IR spectrum for the samples
Wavenumber
3465
(cm-1)
Functional
group
2958,
2926,
2856,
-CH3,
OH---H2O -CH2
(DBS-)
2206
1629 1478
1384
1487
C≡N
C=C
(OCN- or
CO32- NO3(benzCNO-)
ene)
1130,
1037,
1009
639
485
SO42Ni-OH Ni-O
(DBS ) In-OH In-O
Table S2 Gas response results of NIDH-30 sensor to NOx at room temperature in air
(RH: 26%)
NOx
Concentration
(ppm)
97
48.5
9.7
4.85
0.97
0.485 0.097 0.0485 0.0097
Response (%)
60.1
59.3
56.7
53.5
42.3
41.0
38.8
36
15
Response time
(s)
1.2
2
2.9
3.5
6
10
17
23
58