CN106129176B - 一种可控Cu掺杂位ZnSe/ZnS/L‑cys纳米晶的制备方法 - Google Patents
一种可控Cu掺杂位ZnSe/ZnS/L‑cys纳米晶的制备方法 Download PDFInfo
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- SBIBMFFZSBJNJF-UHFFFAOYSA-N selenium;zinc Chemical compound [Se]=[Zn] SBIBMFFZSBJNJF-UHFFFAOYSA-N 0.000 title claims abstract description 28
- 238000002360 preparation method Methods 0.000 title claims abstract description 24
- 239000000243 solution Substances 0.000 claims abstract description 90
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 57
- 239000011701 zinc Substances 0.000 claims abstract description 57
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 57
- 239000002243 precursor Substances 0.000 claims abstract description 36
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims abstract description 30
- 239000007864 aqueous solution Substances 0.000 claims abstract description 29
- 238000006243 chemical reaction Methods 0.000 claims abstract description 29
- 239000010949 copper Substances 0.000 claims abstract description 29
- BUGBHKTXTAQXES-UHFFFAOYSA-N Selenium Chemical compound [Se] BUGBHKTXTAQXES-UHFFFAOYSA-N 0.000 claims abstract description 26
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 25
- JIAARYAFYJHUJI-UHFFFAOYSA-L zinc dichloride Chemical compound [Cl-].[Cl-].[Zn+2] JIAARYAFYJHUJI-UHFFFAOYSA-L 0.000 claims abstract description 22
- 239000008367 deionised water Substances 0.000 claims abstract description 21
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 21
- 229910021592 Copper(II) chloride Inorganic materials 0.000 claims abstract description 19
- NLZOGIZKBBJWPB-UHFFFAOYSA-N [Na].[SeH2] Chemical compound [Na].[SeH2] NLZOGIZKBBJWPB-UHFFFAOYSA-N 0.000 claims abstract description 15
- 239000011592 zinc chloride Substances 0.000 claims abstract description 11
- 235000005074 zinc chloride Nutrition 0.000 claims abstract description 11
- ORTQZVOHEJQUHG-UHFFFAOYSA-L copper(II) chloride Chemical compound Cl[Cu]Cl ORTQZVOHEJQUHG-UHFFFAOYSA-L 0.000 claims abstract description 10
- 239000002244 precipitate Substances 0.000 claims abstract description 9
- 238000005406 washing Methods 0.000 claims abstract description 8
- 239000011258 core-shell material Substances 0.000 claims abstract description 7
- 239000002159 nanocrystal Substances 0.000 claims abstract description 6
- QWZDSGXTFSTEAT-UHFFFAOYSA-N copper zinc selenium(2-) Chemical compound [Cu++].[Zn++].[Se--].[Se--] QWZDSGXTFSTEAT-UHFFFAOYSA-N 0.000 claims abstract description 5
- 229910000033 sodium borohydride Inorganic materials 0.000 claims abstract description 5
- 239000012279 sodium borohydride Substances 0.000 claims abstract description 5
- 239000000203 mixture Substances 0.000 claims abstract description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 70
- 229910052757 nitrogen Inorganic materials 0.000 claims description 35
- XUJNEKJLAYXESH-REOHCLBHSA-N L-Cysteine Chemical compound SC[C@H](N)C(O)=O XUJNEKJLAYXESH-REOHCLBHSA-N 0.000 claims description 28
- 238000013019 agitation Methods 0.000 claims description 27
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 21
- 229910021591 Copper(I) chloride Inorganic materials 0.000 claims description 17
- OXBLHERUFWYNTN-UHFFFAOYSA-M copper(I) chloride Chemical compound [Cu]Cl OXBLHERUFWYNTN-UHFFFAOYSA-M 0.000 claims description 17
- 239000003643 water by type Substances 0.000 claims description 16
- 238000001556 precipitation Methods 0.000 claims description 14
- 238000005253 cladding Methods 0.000 claims description 8
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 7
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 7
- 229910052802 copper Inorganic materials 0.000 description 7
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 5
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 5
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- 239000001257 hydrogen Substances 0.000 description 5
- 229910052739 hydrogen Inorganic materials 0.000 description 5
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- 239000005083 Zinc sulfide Substances 0.000 description 2
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- 238000010899 nucleation Methods 0.000 description 2
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- 238000001228 spectrum Methods 0.000 description 2
- PFNQVRZLDWYSCW-UHFFFAOYSA-N (fluoren-9-ylideneamino) n-naphthalen-1-ylcarbamate Chemical compound C12=CC=CC=C2C2=CC=CC=C2C1=NOC(=O)NC1=CC=CC2=CC=CC=C12 PFNQVRZLDWYSCW-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 239000008346 aqueous phase Substances 0.000 description 1
- UHYPYGJEEGLRJD-UHFFFAOYSA-N cadmium(2+);selenium(2-) Chemical compound [Se-2].[Cd+2] UHYPYGJEEGLRJD-UHFFFAOYSA-N 0.000 description 1
- 238000005660 chlorination reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
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- 231100000614 poison Toxicity 0.000 description 1
- 239000002096 quantum dot Substances 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- WGPCGCOKHWGKJJ-UHFFFAOYSA-N sulfanylidenezinc Chemical compound [Zn]=S WGPCGCOKHWGKJJ-UHFFFAOYSA-N 0.000 description 1
- 238000001308 synthesis method Methods 0.000 description 1
- DRDVZXDWVBGGMH-UHFFFAOYSA-N zinc;sulfide Chemical compound [S-2].[Zn+2] DRDVZXDWVBGGMH-UHFFFAOYSA-N 0.000 description 1
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- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/0248—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by their semiconductor bodies
- H01L31/0256—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by their semiconductor bodies characterised by the material
- H01L31/0264—Inorganic materials
- H01L31/032—Inorganic materials including, apart from doping materials or other impurities, only compounds not provided for in groups H01L31/0272 - H01L31/0312
- H01L31/0322—Inorganic materials including, apart from doping materials or other impurities, only compounds not provided for in groups H01L31/0272 - H01L31/0312 comprising only AIBIIICVI chalcopyrite compounds, e.g. Cu In Se2, Cu Ga Se2, Cu In Ga Se2
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
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- Y02E10/541—CuInSe2 material PV cells
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
本发明公开了一种用于可控Cu掺杂位ZnSe/ZnS/L‑cys纳米晶的制备方法,其主要是将硒粉和硼氢化钠制备成硒氢化钠水溶液,将氯化锌和L‑半胱氨酸制备成锌前驱体溶液,再将氯化铜制备成CuCl2溶液,然后将上述三种溶液混合,回流反应3小时后移至容器中,加入丙酮,使其沉淀,用去离子水和无水乙醇对上述沉淀洗涤,反复离心三次后烘干,研磨成掺铜硒化锌核‑壳结构纳米晶。本发明制备的核‑壳结构Cu:ZnSe/ZnS/L‑cys纳米晶材料的表面光伏响应范围增加约78~100纳米,且均处于可见光范围内;光伏响应强度最大值是原传统方法制得样品光伏响应强度的13~29倍。
Description
技术领域
本发明属于光电子材料技术领域,特别涉及一种掺杂半导体纳米晶的制备方法。
背景技术
核-壳结构掺铜硒化锌/硫化锌纳米晶(也称量子点)属于II/VI族半导体材料。目前,该纳米晶的制备方法主要分油相合成和水相合成法。其独特的核-壳结构和低的生物毒性预示着该材料在光电子、微电子、以及太阳能光伏器件等领域具有更加优异的功能特性和广泛的应用前景。由于不同的制备条件、掺杂元素和配体的选择都会对该纳米晶材料应用性能产生较大影响,因此研究主要集中在如何通过改变上述条件来提高其应用特性等方面。
发明内容
本发明的目的是为了提供一种可以控制ZnSe/ZnS/L-cys核壳纳米晶中不同的铜掺杂位和掺杂机制、表面光伏响应范围大、光伏响应强度大的可控Cu掺杂位ZnSe/ZnS纳米晶制备方法。
本发明的制备方法如下:
(1)硒氢化钠水溶液的制备
将去离子水加入容器并通入N2 30min,按每100ml去离子水加入1.2-2.0g硒粉与1.5-2.3g硼氢化钠的比例,同时向去离子水中加入硒粉和硼氢化钠,在氮气环境和磁力搅拌下,室温反应至黑色硒粉完全消失且溶液澄清,制得硒氢化钠(NaHSe)水溶液并将其密封备用;所述硒粉与硼氢化钠的摩尔比为1:3;
(2)锌前驱体溶液的制备
按每100ml去离子水加入1.1-1.5g氯化锌和1.3-1.8g L-半胱氨酸的比例,将氯化锌和L-半胱氨酸加入到去离子水中,所述氯化锌与L-半胱氨酸摩尔比为1:1.5,待其完全溶解后,在溶解的混合液中加入氢氧化钠溶液,使混合液的pH值调至11,制得锌前驱体溶液;
(3)CuCl2溶液制备
按100ml去离子水加入0.1-0.2g氯化铜的比例,将氯化铜加入到装有去离子水的容器中,CuCl2与上述硒粉的摩尔比为1:11-27,该容器持续通入氮气并磁力搅拌30min,制得CuCl2溶液;
(4)合成巯基配体包覆的Cu:ZnSe/ZnS核壳结构纳米晶
按锌前驱体溶液:NaHSe水溶液的混合液:CuCl2溶液的体积比为4.7:1:1的比例,将步骤⑵的锌前驱体溶液放入容器中,磁力搅拌下通氮气除掉反应液中的氧气,在氮气保护下加热至90℃,向锌前驱体溶液加入步骤(1)制得的NaHSe水溶液,开始回流反应并且计时,在氮气和磁力搅拌下反应0-160min后将温度下调至60℃,再加入步骤(3)制得的CuCl2溶液,3小时回流反应结束后将全部溶液转移至容器中,待其完全冷却至室温,再按每100ml上述混合液加入100ml丙酮的比例,向上述混合液加入丙酮,使其沉淀完全,用去离子水与无水乙醇体积比1:3的乙醇溶液对上述混合液沉淀洗涤,反复离心三次,将所得沉淀置于60℃鼓风干燥箱中烘干,研磨成掺铜硒化锌核-壳结构纳米晶。
本发明与现有技术相比具有如下优点:
(1)通过控制改变反应时间可以控制ZnSe/ZnS/L-cys核壳纳米晶中不同的铜掺杂位和掺杂机制;
(2)与传统制备方法相比,掺铜ZnSe/ZnS核壳纳米晶的表面光伏响应范围增加约78~100纳米,且均处于可见光范围内;
(3)光伏响应强度最大值为4.34×10-2mV,与原传统方法制得样品的光伏响应强度相比增加约13~29倍。
附图说明
图1是本发明核-壳结构Cu:ZnSe/ZnS纳米晶粒子模型示意图,其中1代表核-Cu:ZnSe,2代表壳ZnS,3代表外层L-cys;
图2是本发明实施例1制得的Cu核掺杂ZnSe/ZnS/L-cys纳米晶与纯ZnSe/ZnS/L-cys纳米晶的X-射线衍射图。图中:(a)是纯ZnSe/ZnS/L-cys纳米晶XRD图,(b)是实施例1制得Cu核掺杂ZnSe/ZnS/L-cys纳米晶XRD图。…线代表立方CdS的PDF卡片标准曲线,---线代表立方CdSe的PDF卡片标准曲线;
图3是本发明实施例1-5制得的Cu成核和生长掺杂ZnSe/ZnS/L-cys纳米晶以及纯ZnSe/ZnS/L-cys纳米晶的表面光电压谱图;
图4是本发明实施例1制得的Cu成核掺杂ZnSe/ZnS/L-cys纳米晶电场诱导表面光电压图;
图5是本发明实施例2制得的Cu生长掺杂(1)ZnSe/ZnS/L-cys纳米晶电场诱导表面光电压图;
图6是本发明实施例3制得的Cu生长掺杂(2)ZnSe/ZnS/L-cys纳米晶电场诱导表面光电压图;
图7是本发明实施例4制得的Cu生长掺杂(3)ZnSe/ZnS/L-cys纳米晶的场诱导表面光电压谱。图中(a)是正电场诱导表面光电压图;(b)是负电场诱导表面光电压图;
图8是本发明实施例5制得的Cu生长掺杂(4)ZnSe/ZnS/L-cys纳米晶的场诱导表面光电压谱。图中(a)是正电场诱导表面光电压图;(b)是负电场诱导表面光电压图。
具体实施方式:
实施例1
(1)硒氢化钠水溶液的制备
将100ml去离子水加入容器并通入N2 30min,然后同时加入1.6g硒粉与1.5g硼氢化钠,在氮气环境和磁力搅拌下,室温反应至黑色硒粉完全消失且溶液澄清,制得硒氢化钠(NaHSe)水溶液并将其密封备用;
(2)锌前驱体溶液的制备
将1.1g氯化锌和1.3g L-半胱氨酸加入到100ml去离子水中,待其完全溶解后,在上述混合液中加入氢氧化钠溶液16ml,使其混合液pH值调至11,制得锌前驱体溶液;
(3)CuCl2溶液制备
将0.1g氯化铜加入到含有100ml去离子水容器中,即CuCl2与上述硒粉的摩尔比为1:27,该容器持续通入氮气并磁力搅拌30min,制得CuCl2溶液。
(4)合成巯基配体包覆的核-壳结构Cu:ZnSe/ZnS纳米晶
按锌前驱体溶液与NaHSe水溶液的混合液与CuCl2溶液的体积比为4.7:1:1的比例,将步骤⑵的锌前驱体溶液放入容器中,磁力搅拌下通氮气除掉反应液中的氧气,在氮气保护下加热至90℃,向锌前驱体溶液加入步骤(1)制得的NaHSe水溶液开始回流反应并且计时,在氮气和磁力搅拌下立即将温度下调至60℃,加入步骤(3)制得的CuCl2溶液,3小时回流反应结束后将全部溶液转移至容器中,待其完全冷却至室温,再按每100ml上述混合液加入100ml丙酮的比例,向上述混合液加入丙酮,使其沉淀完全,用去离子水与无水乙醇体积比1:3的乙醇溶液对上述混合液沉淀洗涤,反复离心三次,将所得沉淀置于60℃鼓风干燥箱中烘干并研磨,即得铜-核掺杂硒化锌纳米晶,该纳米晶粒子结构如图1所示,纳米晶核为ZnSe1,壳层为ZnS 2,外层配体为L-cys 3。
如图2所示,制得的铜-核掺杂硒化锌纳米晶与未掺铜硒化锌均为立方闪锌矿结构,其中与未掺铜样品相比(220)和(311)的衍射峰移向大角度的立方硫化锌一侧,说明硫化锌壳层形成;
如图3所示,制得的铜-核掺杂硒化锌纳米晶的表面光伏响应强度不仅明显高于未掺铜硒化锌纳米晶,而且高于其他实施例的表面光伏响应;
如图4所示,制得的铜-核掺杂硒化锌纳米晶在300-700nm波长范围,具有随外加正负电场提高表面光伏响应下降,以及700-800nm波长范围内,表面光伏响应基本不随外加正负电场变化的光伏特性。
实施例2
(1)硒氢化钠水溶液的制备
将100ml去离子水加入容器并通入N2 30min,然后同时加入1.4g硒粉与1.8g硼氢化钠,在氮气环境和磁力搅拌下,室温反应至黑色硒粉完全消失且溶液澄清,制得硒氢化钠(NaHSe)水溶液并将其密封备用;
(2)锌前驱体溶液的制备
将1.2g氯化锌和1.5g L-半胱氨酸加入到100ml去离子水中,待其完全溶解后,在上述混合液中加入氢氧化钠溶液17ml,使其混合液pH值调至11,制得锌前驱体溶液;
(3)CuCl2溶液制备
将0.2g氯化铜加入到含有100ml去离子水容器中,即CuCl2与上述硒粉的摩尔比为1:11,该容器持续通入氮气并磁力搅拌30min,制得CuCl2溶液。
(4)合成巯基配体包覆的核-壳结构Cu:ZnSe/ZnS纳米晶
按锌前驱体溶液与NaHSe水溶液的混合液与CuCl2溶液的体积比为4.7:1:1的比例,将步骤⑵的锌前驱体溶液放入容器中,磁力搅拌下通氮气除掉反应液中的氧气,在氮气保护下加热至90℃,向锌前驱体溶液加入步骤(1)制得的NaHSe水溶液开始回流反应并且计时,在氮气和磁力搅拌下反应20min后将温度下调至60℃,再加入步骤(3)制得的CuCl2溶液,3小时回流反应结束后将全部溶液转移至容器中,待其完全冷却至室温,再按每100ml上述混合液加入100ml丙酮的比例,向上述混合液加入丙酮,使其沉淀完全;用去离子水与无水乙醇体积比1:3乙醇溶液对上述混合液沉淀洗涤,反复离心三次。将所得沉淀置于60℃鼓风干燥箱中烘干并研磨,即得铜-生长掺杂硒化锌核-壳结构纳米晶。
如图3所示,制得的铜-生长掺杂硒化锌纳米晶的表面光伏响应强度明显高于未掺铜硒化锌纳米晶的表面光伏响应;在625-765nm波长范围内的表面光伏响应高于其他实施例。
如图5所示,制得的铜-生长掺杂硒化锌纳米晶在300-700nm波长范围,具有随外加正负电场提高表面光伏响应下降,以及700-800nm波长范围内表面光伏响应随外加正负电场提高而提高的光伏特性。
实施例3
(1)硒氢化钠水溶液的制备
将100ml去离子水加入容器并通入N2 30min,然后同时加入1.2g硒粉与2.0g硼氢化钠,在氮气环境和磁力搅拌下,室温反应至黑色硒粉完全消失且溶液澄清,制得硒氢化钠(NaHSe)水溶液并将其密封备用;
(2)锌前驱体溶液的制备
将1.3g氯化锌和1.6g L-半胱氨酸加入到100ml去离子水中,待其完全溶解后,在上述混合液中加入氢氧化钠溶液18ml,使其混合液pH值调至11,制得锌前驱体溶液;
(3)CuCl2溶液制备
将0.1g氯化铜加入到含有100ml去离子水容器中,即CuCl2与上述硒粉的摩尔比为1:20,该容器持续通入氮气并磁力搅拌30min,制得CuCl2溶液。
(4)合成巯基配体包覆的核-壳结构Cu:ZnSe/ZnS纳米晶
按锌前驱体溶液与NaHSe水溶液的混合液与CuCl2溶液的体积比为4.7:1:1的比例,将步骤⑵的锌前驱体溶液放入容器中,磁力搅拌下通氮气除掉反应液中的氧气,在氮气保护下加热至90℃,向锌前驱体溶液加入步骤(1)制得的NaHSe水溶液开始回流反应并且计时,在氮气和磁力搅拌下反应40min后将温度下调至60℃,再加入步骤(3)制得的CuCl2溶液,3小时回流反应结束后将全部溶液转移至容器中,待其完全冷却至室温,再按每100ml上述混合液加入100ml丙酮的比例,向上述混合液加入丙酮,使其沉淀完全;用去离子水与无水乙醇体积比1:3乙醇溶液对上述混合液沉淀洗涤,反复离心三次。将所得沉淀置于60℃鼓风干燥箱中烘干并研磨,即得铜-生长掺杂硒化锌纳米晶。
如图3所示,制得的铜-生长掺杂硒化锌纳米晶的表面光伏响应强度明显高于未掺铜硒化锌纳米晶的表面光伏响应;在400-600nm波长范围内的表面光伏响应高于其他实施例。
如图6所示,制得的铜-生长掺杂硒化锌纳米晶在300-700nm波长范围,具有随外加正负电场提高表面光伏响应下降,700-750nm波长范围内表面光伏响应随外加正负电场提高而下降,750-800nm波长范围内表面光伏响应随外加正负电场提高而提高的光伏特性。
实施例4
(1)硒氢化钠水溶液的制备
将100ml去离子水加入容器并通入N2 30min,然后同时加入1.8g硒粉与2.2g硼氢化钠,在氮气环境和磁力搅拌下,室温反应至黑色硒粉完全消失且溶液澄清,制得硒氢化钠(NaHSe)水溶液并将其密封备用;
(2)锌前驱体溶液的制备
将1.4g氯化锌和1.7g L-半胱氨酸加入到100ml去离子水中,待其完全溶解后,在上述混合液中加入氢氧化钠溶液16ml,使其混合液pH值调至11,制得锌前驱体溶液;
(3)CuCl2溶液制备
将0.2g氯化铜加入到含有100ml去离子水容器中,即CuCl2与上述硒粉的摩尔比为1:15,该容器持续通入氮气并磁力搅拌30min,制得CuCl2溶液。
(4)合成巯基配体包覆的核-壳结构Cu:ZnSe/ZnS纳米晶
按锌前驱体溶液与NaHSe水溶液的混合液与CuCl2溶液的体积比为4.7:1:1的比例,将步骤⑵的锌前驱体溶液放入容器中,磁力搅拌下通氮气除掉反应液中的氧气,在氮气保护下加热至90℃,向锌前驱体溶液加入步骤(1)制得的NaHSe水溶液开始回流反应并且计时,在氮气和磁力搅拌下反应80min后将温度下调至60℃,再加入步骤(3)制得的CuCl2溶液,3小时回流反应结束后将全部溶液转移至容器中,待其完全冷却至室温,再按每100ml上述混合液加入100ml丙酮的比例,向上述混合液加入丙酮,使其沉淀完全;用去离子水与无水乙醇体积比1:3的乙醇溶液对上述混合液沉淀洗涤,反复离心三次。将所得沉淀置于60℃鼓风干燥箱中烘干并研磨,即得铜-生长掺杂硒化锌纳米晶。
如图3所示,制得的铜-生长掺杂硒化锌纳米晶的表面光伏响应强度明显高于未掺铜硒化锌纳米晶的表面光伏响应;但低于其他实施例的表面光伏响应。
如图7所示,制得的铜-生长掺杂硒化锌纳米晶具有随外加正电场提高表面光伏响应上升,以及随外加负电场绝对值提高表面光伏响应下降(除-5V之外)的光伏特性。
实施例5
(1)硒氢化钠水溶液的制备
将100ml去离子水加入容器并通入N2 30min,然后同时加入2.0g硒粉与2.3g硼氢化钠,在氮气环境和磁力搅拌下,室温反应至黑色硒粉完全消失且溶液澄清,制得硒氢化钠(NaHSe)水溶液并将其密封备用;
(2)锌前驱体溶液的制备
将1.5g氯化锌和1.8g L-半胱氨酸加入到100ml去离子水中,待其完全溶解后,在上述混合液中加入氢氧化钠溶液16ml,使其混合液pH值调至11,制得锌前驱体溶液;
(3)CuCl2溶液制备
将0.15g氯化铜加入到含有100ml去离子水容器中,即CuCl2与上述硒粉的摩尔比为1:23,该容器持续通入氮气并磁力搅拌30min,制得CuCl2溶液。
(4)合成巯基配体包覆的核-壳结构Cu:ZnSe/ZnS纳米晶
按锌前驱体溶液与NaHSe水溶液的混合液与CuCl2溶液的体积比为4.7:1:1的比例,将步骤⑵的锌前驱体溶液放入容器中,磁力搅拌下通氮气除掉反应液中的氧气,在氮气保护下加热至90℃,向锌前驱体溶液加入步骤(1)制得的NaHSe水溶液开始回流反应并且计时,在氮气和磁力搅拌下反应160min后将温度下调至60℃,再加入步骤(3)制得的CuCl2溶液,3小时回流反应结束后将全部溶液转移至容器中,待其完全冷却至室温,再按每100ml上述混合液加入100ml丙酮的比例,向上述混合液加入丙酮,使其沉淀完全;用去离子水与无水乙醇体积比1:3的乙醇溶液对上述混合液沉淀洗涤,反复离心三次。将所得沉淀置于60℃鼓风干燥箱中烘干并研磨,即得铜-生长掺杂硒化锌纳米晶。
如图3所示,制得的铜-生长掺杂硒化锌纳米晶的表面光伏响应强度明显高于未掺铜硒化锌纳米晶的表面光伏响应,但低于其他实施例的表面光伏响应,且在675nm波长出现一个新的光伏响应峰;
如图8所示,制得的铜-生长掺杂硒化锌纳米晶具有随外加正负电场提高表面光伏响应提高的光伏特性。
Claims (1)
1.一种可控Cu掺杂位ZnSe/ZnS/L-cys纳米晶制备方法,其特征在于:
(1)硒氢化钠水溶液的制备
将去离子水加入容器并通入N2 30min,按每100ml去离子水加入1.2-2.0g硒粉与1.5-2.3g硼氢化钠的比例,同时向去离子水中加入硒粉和硼氢化钠,在氮气环境和磁力搅拌下,室温反应至黑色硒粉完全消失且溶液澄清,制得硒氢化钠(NaHSe)水溶液并将其密封备用;所述硒粉与硼氢化钠的摩尔比为1:3;
(2)锌前驱体溶液的制备
按每100ml去离子水加入1.1-1.5g氯化锌和1.3-1.8g L-半胱氨酸的比例,将氯化锌和L-半胱氨酸加入到去离子水中,所述氯化锌与L-半胱氨酸摩尔比为1:1.5,待其完全溶解后,在溶解的混合液中加入氢氧化钠溶液,使混合液的pH值调至11,制得锌前驱体溶液;
(3)CuCl2溶液制备
按100ml去离子水加入0.1-0.2g氯化铜的比例,将氯化铜加入到装有去离子水的容器中,CuCl2与上述硒粉的摩尔比为1:11-27,该容器持续通入氮气并磁力搅拌30min,制得CuCl2溶液;
(4)合成巯基配体包覆的Cu:ZnSe/ZnS核壳结构纳米晶
按锌前驱体溶液:NaHSe水溶液的混合液:CuCl2溶液的体积比为4.7:1:1的比例,将步骤⑵的锌前驱体溶液放入容器中,磁力搅拌下通氮气除掉反应液中的氧气,在氮气保护下加热至90℃,向锌前驱体溶液加入步骤(1)制得的NaHSe水溶液,开始回流反应并且计时,在氮气和磁力搅拌下反应0-160min后将温度下调至60℃,再加入步骤(3)制得的CuCl2溶液,3小时回流反应结束后将全部溶液转移至容器中,待其完全冷却至室温,再按每100ml上述混合液加入100ml丙酮的比例,向上述混合液加入丙酮,使其沉淀完全,用去离子水与无水乙醇体积比1:3的乙醇溶液对上述混合液沉淀洗涤,反复离心三次,将所得沉淀置于60℃鼓风干燥箱中烘干,研磨成掺铜硒化锌核-壳结构纳米晶。
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