Near-infrared Responsive MoS2/Poly(N-isopropylacrylamide ...
Near-infrared Responsive MoS2/Poly(N-isopropylacrylamide) Hydrogels for Remote Light-Controlled Microvalves Junyang Zhang, Ping Du, Danyun Xu, and Xiaobin Fan*
Yang Li, Wenchao Peng, Guoliang Zhang, Fengbao Zhang*
School of Chemical Engineering and Technology, State Key Laboratory of Chemical Engineering, Collaborative Innovation Center of Chemical Science and Engineering, Tianjin University, Tianjin 300072, China Email: [email protected]; [email protected] Supporting Information
Figure S1. SEM images of pure PNIPAM hydrogel.
Figure S2. SEM images of freeze-dried MoS2/PNIPAM composite hydrogel in the deformed state.
-Mo3d -S2p
-C1s
-N 1s -Mo3p3 -Mo3p1
-O1s -O KLL
-N KLL
-C KLL
Intensity (a.u.)
1200
1000
800
600
400
200
0
Binding Energy (eV)
Figure S3. Full XPS spectra of the MoS2/PNIPAM hydrogel on a cut fraction.
Raman intensity
A1g
100
J1 1
E2g J3 J2
150
200
E1g
250
300
350
400
450
-1
Raman shift (cm )
Figure S4. Raman spectra for MoS2/PNIPAM after 0.8W NIR light exposure for 1h. J1, J2, and J3 1T peaks didn’t disappear, indicating the phase stability of MoS2 upon NIR irradiation.
40 35
Swelling ratio
30
heating
25 20 cooling
15 10 5 0 20
25
30
o
35
40
temperature( C)
Figure S5. Swelling ratio dependence on temperature for pure PNIPAM (black) and MoS2/PNIPAM hydrogel with 0.5 mg mL–1 MoS2 (red) in one heating-and-cooling cycle. There is hysteresis of both the samples, which is attributed to the formation of intra- and interchain hydrogen bonds between different chain segments when they are overlapped in the collapsed state.
40 o
20 C
35
Swelling ratio
30 25 20 15 10 5 o
40 C
0 0
1
2
3
4
5
cycles Figure S6. Swelling ratio changes of the MoS2/PNIPAM hydrogels as a function of heating-cooling cycle.
Raman intensity
404
100
381
150
200
250
300
350
400
450
-1
Ranman shift (cm )
Figure S7. Raman spectra for MoS2/PNIPAM hydrogel with 0.5 mg mL–1 MoS2 after five swell-deswell cycles. The E12g peak (381) and A1g (404) peak of the composite hydrogel do not shift even after five swell-deswell cycles, indicating the number of layers of MoS2 is not changed.
Figure S8. Images of a vertically positioned microvalve at various time points. The composite hydrogel could block the rhodamine solution for at least 15 days.
Yang Li, Wenchao Peng, Guoliang Zhang, Fengbao Zhang*
School of Chemical Engineering and Technology, State Key Laboratory of Chemical Engineering, Collaborative Innovation Center of Chemical Science and Engineering, Tianjin University, Tianjin 300072, China Email: [email protected]; [email protected] Supporting Information
Figure S1. SEM images of pure PNIPAM hydrogel.
Figure S2. SEM images of freeze-dried MoS2/PNIPAM composite hydrogel in the deformed state.
-Mo3d -S2p
-C1s
-N 1s -Mo3p3 -Mo3p1
-O1s -O KLL
-N KLL
-C KLL
Intensity (a.u.)
1200
1000
800
600
400
200
0
Binding Energy (eV)
Figure S3. Full XPS spectra of the MoS2/PNIPAM hydrogel on a cut fraction.
Raman intensity
A1g
100
J1 1
E2g J3 J2
150
200
E1g
250
300
350
400
450
-1
Raman shift (cm )
Figure S4. Raman spectra for MoS2/PNIPAM after 0.8W NIR light exposure for 1h. J1, J2, and J3 1T peaks didn’t disappear, indicating the phase stability of MoS2 upon NIR irradiation.
40 35
Swelling ratio
30
heating
25 20 cooling
15 10 5 0 20
25
30
o
35
40
temperature( C)
Figure S5. Swelling ratio dependence on temperature for pure PNIPAM (black) and MoS2/PNIPAM hydrogel with 0.5 mg mL–1 MoS2 (red) in one heating-and-cooling cycle. There is hysteresis of both the samples, which is attributed to the formation of intra- and interchain hydrogen bonds between different chain segments when they are overlapped in the collapsed state.
40 o
20 C
35
Swelling ratio
30 25 20 15 10 5 o
40 C
0 0
1
2
3
4
5
cycles Figure S6. Swelling ratio changes of the MoS2/PNIPAM hydrogels as a function of heating-cooling cycle.
Raman intensity
404
100
381
150
200
250
300
350
400
450
-1
Ranman shift (cm )
Figure S7. Raman spectra for MoS2/PNIPAM hydrogel with 0.5 mg mL–1 MoS2 after five swell-deswell cycles. The E12g peak (381) and A1g (404) peak of the composite hydrogel do not shift even after five swell-deswell cycles, indicating the number of layers of MoS2 is not changed.
Figure S8. Images of a vertically positioned microvalve at various time points. The composite hydrogel could block the rhodamine solution for at least 15 days.
