高等学校化学学报 ›› 2023, Vol. 44 ›› Issue (4): 20220636.doi: 10.7503/cjcu20220636
收稿日期:
2022-09-24
出版日期:
2023-04-10
发布日期:
2022-12-02
通讯作者:
石淑先
E-mail:shisx@mail.buct.edu.cn
基金资助:
YAN Yutian, WU Si, CHANG Kangkang, XIA Yuzheng, CHEN Xiaonong, SHI Shuxian()
Received:
2022-09-24
Online:
2023-04-10
Published:
2022-12-02
Contact:
SHI Shuxian
E-mail:shisx@mail.buct.edu.cn
Supported by:
摘要:
金纳米粒子(AuNPs)表面能高, 在水中极易团聚, 使其应用受限. 本文采用物理共混法, 将带有正电荷的温敏聚(N-异丙基丙烯酰胺)(PNIPAM)微凝胶与带负电荷的AuNPs混合, 经自组装制备了微凝胶表面覆盖AuNPs的有机-金属复合粒子AuNPs@PNIPAM. 该复合粒子不仅具有很好的分散稳定性, 而且其粒子的分散液具有温度比色性, 在25 ℃→50 ℃→25 ℃的温度变化过程中呈现“红→紫→红”的可逆颜色变化. 通过对硝基苯酚(4-NP)的还原反应, 研究了复合粒子的催化性能. 结果表明, 复合粒子具有受温度调控的催化能力, 随温度升高催化性能呈现先降后升的趋势. 与文献报道的类似材料相比, AuNPs@PNIPAM复合粒子同时具有温度比色性和催化性能.
中图分类号:
TrendMD:
闫雨甜, 吴思, 常康康, 夏宇正, 陈晓农, 石淑先. 表面覆盖型AuNPs@PNIPAM复合粒子的制备及催化性能. 高等学校化学学报, 2023, 44(4): 20220636.
YAN Yutian, WU Si, CHANG Kangkang, XIA Yuzheng, CHEN Xiaonong, SHI Shuxian. Preparation and Catalytic Performance of Surface-covered AuNPs@PNIPAM Composite Particles. Chem. J. Chinese Universities, 2023, 44(4): 20220636.
Fig.1 SEM image of PNIPAM microgels prepared at 70 ℃ with 5%(molar fraction) crosslinking agent(A) and Dh of PNIPAM microgels prepared at different temperatures(B) and different molar fractions of crosslinking agent(C)(B) Molar fraction of crosslinking agent is 5%; (C) polymerization temperature is 80 ℃.
Fig.2 Dh of PNIPAM microgels prepared at 80 ℃ with 1.5% crosslinking agent and its dispersion system at different temperatures(A) and shrinking ratio of PNIPAM microgels prepared at 80 ℃ with different amounts of crosslinking agent(B)Insets of (A): optical photos of PNIPAM microgels dispersion at 25 °C(left) and 50 °C(right).
Fig.4 Color changes of AuNPs@PNIPAM dispersion during five heating⁃cooling cycles(A) and UV⁃Vis spectra of AuNPs and AuNPs@PNIPAM dispersion(B) and UV⁃Vis maximum absorption peaks of AuNPs@PNIPAM dispersion in five heating⁃cooling cycles(C)
Fig.5 SEM images of AuNPs@PNIPAM composite particles prepared by different dosage of crosslinking agent at initially 25 ℃(A1—D1), after heated to 50 ℃(A2—D2) and after cooled back to 25 ℃(A3—D3)Dosage of crossling agent(%, molar fraction): (A1—A3) 1.5%; (B1—B3) 3.0%; (C1—C3) 5.0%.(D1—D3) The magnified images of (C1—C3).
Fig.6 Effect of reaction temperature on the catalytic activity of AuNPs@PNIPAM composite particles(A) Plots of ln(ct /c0) versus reaction time in the presence of AuNPs@PNIPAM; (B) plot of Kappversus temperature in the presence of AuNPs@PNIPAM.
No. | Composite | Temperature range/°C | Color change | Δλ | Note | Ref. |
---|---|---|---|---|---|---|
1 | AuNPs@PNIPAM in PAAm hydrogel | 24—50 | Red↔grayish violet | 176 | Eight times concentration of AuNPs@PNIPAM in hydrogel | [ |
2 | PNIPAM/AuNP | 25—50 | Wine↔violet | 152 | Low AuNPs loadings(surface covered) | [ |
3 | PNIPAM⁃Au a | 20—50 | — b | 40 | In situ reduction | [ |
4 | Au@NH2⁃PNIPAM | 25—45 | — b | 30 | PNIPAM⁃NH2 | [ |
5 | Au@PNIPAM⁃co⁃AA | 25—50 | Wine↔violet | 29 | Equilibrium time was 30 min | [ |
6 | AuNPs@PNIPAM a | 25—50 | Red↔purple | 16.7 | Equilibrium time was 10 min | This work |
7 | AuAg@pNIPAM@Ag a | 25—50 | — b | 11 | Core⁃satellite | [ |
8 | Au@pNIPAM | 10—50 | — b | 10 | Core⁃shell | [ |
9 | PNIPAMs⁃AuNP a | 25—50 | Remained red and transparent | 1.2 | Core⁃shell | [ |
10 | SiO2@PMBA@Au@PNIPAM a | 20—40 | — b | No shift | Yolk⁃shell | [ |
11 | MNP@SiO2⁃PNIPAm⁃AuNPs a | 25—40 | Small variation in transparency | No date d | Core⁃satellite | [ |
12 | Au⁃PNIPAM | 25—50 | — b | No date d | Yolk⁃shell | [ |
13 | Core⁃satellite nanoassemblies | 25—55 | — b | No date d | Core⁃satellite | [ |
14 | PNIPAM⁃Au a | 20—45 | Small variation in transparency | — b | High AuNPs loadings(random filled) | [ |
15 | Gold@polymer core⁃shell nanoparticles | 25—50 | Small variation in transparency | — b | Core⁃shell | [ |
16 | PNIPAM/Au@meso⁃SiO2a | 25—50 | Light purple(transparent to cloudy) | — b | Hollow microsphere | [ |
Table 1 Comparison of color change and absorption peak shifts in different references
No. | Composite | Temperature range/°C | Color change | Δλ | Note | Ref. |
---|---|---|---|---|---|---|
1 | AuNPs@PNIPAM in PAAm hydrogel | 24—50 | Red↔grayish violet | 176 | Eight times concentration of AuNPs@PNIPAM in hydrogel | [ |
2 | PNIPAM/AuNP | 25—50 | Wine↔violet | 152 | Low AuNPs loadings(surface covered) | [ |
3 | PNIPAM⁃Au a | 20—50 | — b | 40 | In situ reduction | [ |
4 | Au@NH2⁃PNIPAM | 25—45 | — b | 30 | PNIPAM⁃NH2 | [ |
5 | Au@PNIPAM⁃co⁃AA | 25—50 | Wine↔violet | 29 | Equilibrium time was 30 min | [ |
6 | AuNPs@PNIPAM a | 25—50 | Red↔purple | 16.7 | Equilibrium time was 10 min | This work |
7 | AuAg@pNIPAM@Ag a | 25—50 | — b | 11 | Core⁃satellite | [ |
8 | Au@pNIPAM | 10—50 | — b | 10 | Core⁃shell | [ |
9 | PNIPAMs⁃AuNP a | 25—50 | Remained red and transparent | 1.2 | Core⁃shell | [ |
10 | SiO2@PMBA@Au@PNIPAM a | 20—40 | — b | No shift | Yolk⁃shell | [ |
11 | MNP@SiO2⁃PNIPAm⁃AuNPs a | 25—40 | Small variation in transparency | No date d | Core⁃satellite | [ |
12 | Au⁃PNIPAM | 25—50 | — b | No date d | Yolk⁃shell | [ |
13 | Core⁃satellite nanoassemblies | 25—55 | — b | No date d | Core⁃satellite | [ |
14 | PNIPAM⁃Au a | 20—45 | Small variation in transparency | — b | High AuNPs loadings(random filled) | [ |
15 | Gold@polymer core⁃shell nanoparticles | 25—50 | Small variation in transparency | — b | Core⁃shell | [ |
16 | PNIPAM/Au@meso⁃SiO2a | 25—50 | Light purple(transparent to cloudy) | — b | Hollow microsphere | [ |
No. | Catalyst | Configuration | Au(composite)/4⁃NP a | T/℃ | t1/2/min | Kapp/min-1 | Con.(%) | Ref. |
---|---|---|---|---|---|---|---|---|
1 | MNP@SiO2⁃PNIPAm⁃AuNPs | Core⁃satellite | 7.5 | 25 | 0.99 | 0.70 | >97 | [ |
2 | AuNPs@GFDP | Core⁃shell | 0.43 | 25 | 1.05 | 0.66 | >97 | [ |
3 | AuNPs@PNIPAM | Surface covered | 0.17 | 25 | 1.31 | 0.53 | >97 | This work |
4 | PNIPAM⁃Au | Random filled | 0.00068 | 20 | 1.47 | 0.47 | >85 | [ |
5 | SiO2@PMBA@Au@PNIPAM | Yolk⁃shell | 0.059 | 20 | 3.85 | 0.18 | >97 | [ |
6 | PNIPAM⁃AuNPs | Core⁃shell | 0.23 | 25 | 5.33 | 0.16 | >93 | [ |
7 | Au/micelle composite | Random filled | 0.018 | 25 | 91.69 | 7.56×10-3 | >80 | [ |
8 | Au@P1 | Core⁃shell | 0.017 | 25 | 1.44×104 | 4.80×10-5 | >95 | [ |
9 | Au@PNIPAm/PEI | Surface covered | 13.5 | 29 | 0.47 | 1.46 | >30 | [ |
10 | Au@mesoporous⁃SiO2 | Hollow microsphere | 0.024 | 30 | 1.16 | 0.60 | >90 | [ |
11 | AuAg@pNIPAM@Ag | Core⁃satellite | 4.5 | 25 | 1.39 | 0.50 | >97 | [ |
12 | RGO/PVEIM⁃b⁃PNIPAM/GNP | Surface covered(on sheets) | 0.33 | 30 | 1.51 | 0.46 | >85 | [ |
13 | Fe3O4/Au/SiO2/NIPAM | Yolk⁃shell | 0.0035 | 25 | 3.47 | 0.20 | >90 | [ |
14 | PNIPAM⁃catechol@Au | Random filled | 7.0 | 25 | 10.50 | 6.60×10-2 | >60 | [ |
15 | AuNR@PNV@AuNP | Core⁃satellite | 0.05 mg b | 25±5 | 2.77 | 0.25 | >97 | [ |
16 | PNIPAM⁃Au | Random filled | 0.03 mg b | 30 | 4.08 | 0.17 | >95 | [ |
Table 2 Comparison of the reaction time and Kapp in different references
No. | Catalyst | Configuration | Au(composite)/4⁃NP a | T/℃ | t1/2/min | Kapp/min-1 | Con.(%) | Ref. |
---|---|---|---|---|---|---|---|---|
1 | MNP@SiO2⁃PNIPAm⁃AuNPs | Core⁃satellite | 7.5 | 25 | 0.99 | 0.70 | >97 | [ |
2 | AuNPs@GFDP | Core⁃shell | 0.43 | 25 | 1.05 | 0.66 | >97 | [ |
3 | AuNPs@PNIPAM | Surface covered | 0.17 | 25 | 1.31 | 0.53 | >97 | This work |
4 | PNIPAM⁃Au | Random filled | 0.00068 | 20 | 1.47 | 0.47 | >85 | [ |
5 | SiO2@PMBA@Au@PNIPAM | Yolk⁃shell | 0.059 | 20 | 3.85 | 0.18 | >97 | [ |
6 | PNIPAM⁃AuNPs | Core⁃shell | 0.23 | 25 | 5.33 | 0.16 | >93 | [ |
7 | Au/micelle composite | Random filled | 0.018 | 25 | 91.69 | 7.56×10-3 | >80 | [ |
8 | Au@P1 | Core⁃shell | 0.017 | 25 | 1.44×104 | 4.80×10-5 | >95 | [ |
9 | Au@PNIPAm/PEI | Surface covered | 13.5 | 29 | 0.47 | 1.46 | >30 | [ |
10 | Au@mesoporous⁃SiO2 | Hollow microsphere | 0.024 | 30 | 1.16 | 0.60 | >90 | [ |
11 | AuAg@pNIPAM@Ag | Core⁃satellite | 4.5 | 25 | 1.39 | 0.50 | >97 | [ |
12 | RGO/PVEIM⁃b⁃PNIPAM/GNP | Surface covered(on sheets) | 0.33 | 30 | 1.51 | 0.46 | >85 | [ |
13 | Fe3O4/Au/SiO2/NIPAM | Yolk⁃shell | 0.0035 | 25 | 3.47 | 0.20 | >90 | [ |
14 | PNIPAM⁃catechol@Au | Random filled | 7.0 | 25 | 10.50 | 6.60×10-2 | >60 | [ |
15 | AuNR@PNV@AuNP | Core⁃satellite | 0.05 mg b | 25±5 | 2.77 | 0.25 | >97 | [ |
16 | PNIPAM⁃Au | Random filled | 0.03 mg b | 30 | 4.08 | 0.17 | >95 | [ |
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