CN110756821B - 一种在硅层上负载纳米金的合成方法 - Google Patents
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- SZVJSHCCFOBDDC-UHFFFAOYSA-N ferrosoferric oxide Chemical compound O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 claims abstract description 30
- CIWBSHSKHKDKBQ-JLAZNSOCSA-N Ascorbic acid Chemical compound OC[C@H](O)[C@H]1OC(=O)C(O)=C1O CIWBSHSKHKDKBQ-JLAZNSOCSA-N 0.000 claims abstract description 26
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 24
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 claims abstract description 22
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- WYTZZXDRDKSJID-UHFFFAOYSA-N (3-aminopropyl)triethoxysilane Chemical compound CCO[Si](OCC)(OCC)CCCN WYTZZXDRDKSJID-UHFFFAOYSA-N 0.000 claims abstract description 5
- 239000011258 core-shell material Substances 0.000 claims abstract description 5
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 claims abstract description 5
- 239000003153 chemical reaction reagent Substances 0.000 claims abstract description 4
- 229910052681 coesite Inorganic materials 0.000 claims abstract description 4
- 229910052906 cristobalite Inorganic materials 0.000 claims abstract description 4
- 238000001027 hydrothermal synthesis Methods 0.000 claims abstract description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229910052682 stishovite Inorganic materials 0.000 claims abstract description 4
- 229910052905 tridymite Inorganic materials 0.000 claims abstract description 4
- 238000007865 diluting Methods 0.000 claims abstract description 3
- 230000003301 hydrolyzing effect Effects 0.000 claims abstract description 3
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 8
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 8
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 229910021642 ultra pure water Inorganic materials 0.000 claims description 3
- 239000012498 ultrapure water Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 3
- 238000005265 energy consumption Methods 0.000 abstract description 2
- 238000002360 preparation method Methods 0.000 abstract description 2
- 239000002105 nanoparticle Substances 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000011065 in-situ storage Methods 0.000 description 3
- 239000002122 magnetic nanoparticle Substances 0.000 description 3
- 238000003786 synthesis reaction Methods 0.000 description 3
- 235000005311 Pandanus odoratissimus Nutrition 0.000 description 1
- 240000002390 Pandanus odoratissimus Species 0.000 description 1
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Abstract
一种在硅层上负载纳米金的合成方法,涉及纳米金的制备。包括以下步骤:1)利用水热反应法合成四氧化三铁,洗涤后备用。2)将硅酸乙酯稀释在乙醇中,加入到含有四氧化三铁颗粒的碱性溶液中,TEOS水解在四氧化三铁表面形成硅层,再利用APTES在硅层表面修饰上氨基,洗涤以除去多余的反应试剂;3)硅包四氧化三铁负载纳米金颗粒的合成:碱性条件下,向硅包四氧化三铁溶液中加入氯金酸,超声0.5h后,再向体系中加入20μL配制的抗坏血酸溶液,反应0.5h后停止超声,即获得稳定均一的Fe3O4@SiO2@Au核壳材料。材料廉价易得;操作简单,在室温下,使用超声的方法,减少能源消耗,无需超低温或者超高温,绿色环保。
Description
技术领域
本发明涉及纳米金的制备,尤其是涉及一种在硅层上负载纳米金的合成方法。
背景技术
纳米金具有很好的生物相容性,在各个领域都具有广泛的应用。当纳米金与其他物质形成复合材料的时候,更是拓宽了其应用。目前在硅层表面修饰上纳米金颗粒的方法主要有两种,一种是直接在合成纳米金之后,通过搅拌的方法固载到硅层表面(Fang,C.L.;Qian,K.;Zhu,J.;Wang,S.;Lv,X.;Yu,S.H.Nanotechnology 2008,19,125601.),另一种方法是原位合成,但是需要严格控制加热的反应条件(Sarah L.Westcott;StevenJ.Oldenburg;T.Randall Lee;Halas*,N.J.Langmuir 1998,14,5396-5401.)。这些方法存在步骤繁琐,操作费时的问题。因此需要开发一种新的简便负载方法。
发明内容
本发明的目的在于提供一种在硅层上负载纳米金的合成方法。
本发明包括以下步骤:
1)利用水热反应法合成四氧化三铁,洗涤后备用。
2)将硅酸乙酯(TEOS)稀释在乙醇中,加入到含有四氧化三铁颗粒的碱性溶液中,TEOS水解在四氧化三铁表面形成硅层,再利用APTES在硅层表面修饰上氨基,洗涤以除去多余的反应试剂;
3)硅包四氧化三铁负载纳米金颗粒的合成:碱性条件下,向硅包四氧化三铁溶液中加入氯金酸,超声0.5h后,再向体系中加入20μL配制的抗坏血酸溶液,反应0.5h后停止超声,即获得稳定均一的Fe3O4@SiO2@Au核壳材料。
在步骤1)中,所述四氧化三铁的粒径可为80~250nm;所述洗涤可使用超纯水洗涤3遍。
在步骤2)中,所述硅酸乙酯(TEOS)、乙醇、碱性溶液的配比可为(1~2)︰(200~300)︰(4~5),所述碱性溶液可采用浓氨水,浓度25%~28%;所述洗涤可使用乙醇和水各洗2遍。
在步骤3)中,所述碱性条件由氨水调节,pH为9~9.4;所述硅包四氧化三铁溶液、氯金酸、抗坏血酸的配比可为(20~30)︰(1~2)︰(2~4);所述抗坏血酸溶液为抗坏血酸直接溶于水,0.2M,加入量可为20μL。
本发明是一种在硅包磁性纳米颗粒表面修饰纳米金的新方法,即以超声的方法在硅包磁性纳米颗粒表面原位合成纳米金小颗粒。具体来讲,首先使用还原法合成纳米金颗粒,然后在纳米金表面裹上硅层,利用3-氨基丙基三乙氧基硅烷水解在硅层形成氨基,最后氯金酸在硅层表面原位还原形成均一的核壳材料。
与现有技术相比,本发明具有以下突出优点:
本发明中使用的材料都廉价易得;操作简单,在室温条件下,使用超声的方法,减少能源的消耗,无需超低温或者超高温,具有绿色环保的优点。
附图说明
图1超声法在硅包磁性纳米颗粒上负载纳米金的电镜图。
具体实施方式
以下实施例将结合附图对本发明作进一步的说明。
实施例1:
本实施例包括以下步骤:
1)四氧化三铁纳米颗粒的合成:利用水热反应法合成平均粒径约为150nm的四氧化三铁纳米颗粒,下一步使用之前使用超纯水洗涤3遍。
2)合成硅包四氧化三铁:首先将硅酸乙酯(TEOS)以1︰150的比例稀释在乙醇中,取1500μL加入步骤1中合成的500μL四氧化三铁纳米颗粒水溶液中,再加入50μL浓氨水,TEOS水解形成硅层。然后再利用APTES在硅层表面水解修饰上氨基。材料在进行下一步反应之前使用乙醇和水各洗2遍以除去多余的反应试剂。
3)硅包四氧化三铁负载纳米金颗粒的合成:向200μL硅包四氧化三铁溶液中加入10μL氯金酸(0.1%),调节pH至9.5,超声0.5h后,再向体系中加20μL新配的抗坏血酸(0.2M),反应半小时后停止超声,可获得稳定均一的Fe3O4@SiO2@Au核壳材料,如图1。
实施例2:
与实施例1类似,其区别在于在步骤2)中,所述硅酸乙酯(TEOS)、乙醇、碱性溶液的配比可为2︰280︰4,所述碱性溶液采用浓氨水,浓度28%;在步骤3)中,所述硅包四氧化三铁溶液、氯金酸、抗坏血酸的配比为20︰1︰2。
实施例3:
与实施例1类似,其区别在于在步骤2)中,所述硅酸乙酯(TEOS)、乙醇、碱性溶液的配比可为1︰200︰5,所述碱性溶液采用浓氨水,浓度25%;在步骤3)中,所述硅包四氧化三铁溶液、氯金酸、抗坏血酸的配比为30︰2︰4。
实施例4:
与实施例1类似,其区别在于在步骤2)中,所述硅酸乙酯(TEOS)、乙醇、碱性溶液的配比可为1.5︰300︰5,所述碱性溶液采用浓氨水,浓度27%;在步骤3)中,所述硅包四氧化三铁溶液、氯金酸、抗坏血酸的配比为25︰1︰3。
Claims (6)
1.一种在硅层上负载纳米金的合成方法,其特征在于包括以下步骤:
1)利用水热反应法合成四氧化三铁,洗涤后备用;所述四氧化三铁的粒径为80~250nm;
2)将硅酸乙酯稀释在乙醇中,加入到含有四氧化三铁颗粒的碱性溶液中,硅酸乙酯水解在四氧化三铁表面形成硅层,再利用APTES在硅层表面修饰上氨基,洗涤以除去多余的反应试剂;所述硅酸乙酯、乙醇、碱性溶液的配比为(1~2)︰(200~300)︰(4~5);
3)硅包四氧化三铁负载纳米金颗粒的合成:碱性条件下,向硅包四氧化三铁溶液中加入氯金酸,超声0.5h后,再向体系中加入20μL配制的抗坏血酸溶液,反应0.5h后停止超声,即获得稳定均一的Fe3O4@SiO2@Au核壳材料;所述硅包四氧化三铁溶液、氯金酸、抗坏血酸的配比为(20~30)︰(1~2)︰(2~4)。
2.如权利要求1所述一种在硅层上负载纳米金的合成方法,其特征在于在步骤1)中,所述洗涤使用超纯水洗涤3遍。
3.如权利要求1所述一种在硅层上负载纳米金的合成方法,其特征在于在步骤2)中,所述碱性溶液采用浓氨水,浓度25%~28%。
4.如权利要求1所述一种在硅层上负载纳米金的合成方法,其特征在于在步骤2)中,所述洗涤使用乙醇和水各洗2遍。
5.如权利要求1所述一种在硅层上负载纳米金的合成方法,其特征在于在步骤3)中,所述碱性条件由氨水调节,pH为9~9.4。
6.如权利要求1所述一种在硅层上负载纳米金的合成方法,其特征在于在步骤3)中,所述抗坏血酸溶液为抗坏血酸直接溶于水,0.2M,加入量为20μL。
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