| N型Ag2Te@PEDOT:PSS复合材料薄膜的制备与热电性能 |
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| 引用本文： | 宋海军,汤成莉,张礼兵,孙权. N型Ag2Te@PEDOT:PSS复合材料薄膜的制备与热电性能[J]. 复合材料学报, 2021, 38(7): 2284-2294. DOI: 10.13801/j.cnki.fhclxb.20210312.003 |
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| 作者姓名： | 宋海军 汤成莉 张礼兵 孙权 |
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| 作者单位： | 嘉兴学院 机电工程学院，嘉兴 314001 |
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| 基金项目： | 浙江省自然科学青年基金(LQ20E030015)；国家自然科学基金青年科学基金(61704067) |
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| 摘 要： | 利用一步热还原法制备了聚3, 4-乙烯二氧噻吩:聚苯乙烯磺酸包覆的Te纳米线(Te@PEDOT:PSS)复合膜，然后将其浸入不同浓度的AgNO3溶液中，通过Ag+与Te的反应使Te向Ag2Te转变，从而使热电材料由P型的Te@PEDOT:PSS复合膜转化为N型的Ag2Te@PEDOT:PSS复合膜。通过FESEM、TEM、XPS、XRD等表征手段揭示了掺杂过程中AgNO3与Te@PEDOT:PSS复合膜的作用机制，探究了掺杂浓度对Ag2Te@PEDOT:PSS复合膜热电性能的影响。反应中Ag2Te@PEDOT:PSS复合膜的电导率随着AgNO3溶液浓度的增加呈先增大后减小的趋势，主要是由于AgNO3浓度较大时生成TeO2造成的，Seebeck系数随着AgNO3浓度增大而迅速减小，主要是由于反应生成的Ag2Te为N型传导，当Ag2Te所提供的电子数量超过Te提供的空穴数量时，材料的传导机制由P型变为N型，即Seebeck系数由正变负，随着AgNO3浓度的增大，Seebeck系数的绝对值变大，当AgNO3溶液浓度为10 mmol时，Seebeck系数为(?55.9±3.3) μV/K。当AgNO3溶液浓度为20 mmol时，N型Ag2Te@PEDOT:PSS复合膜的功率因子达最大值，为(8.4±0.7) μW/(m·K2)。
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| 关 键 词： | PEDOT:PSS Ag2Te 复合材料 热电性能 薄膜 Seebeck系数 |
| 收稿时间： | 2021-01-18 |
Preparation and thermoelectric properties of N type Ag2Te@PEDOT:PSS composite films |
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| Affiliation: | School of Mechanical and Electrical Engineering, Jiaxing University, Jiaxing 314001, China |
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| Abstract: | The poly(3,4-ethyl-enedioxythiophene): polystyrenesulfonate functionalized Te nanowires (Te@PEDOT:PSS) composite films were in situ synthesized using a one-step thermal reduction process. Then the Te@PEDOT:PSS composite films were immersed into AgNO3 solutions with different concentration to prepare Ag2Te@PEDOT:PSS composite films. By introducing Ag+ into the Te@PEDOT:PSS composite films, P type Te@PEDOT:PSS composite films was transformed to N type Ag2Te@PEDOT:PSS composite films. FESEM, TEM, XPS, and XRD were used to analysis the reaction mechanism between AgNO3 and Te@PEDOT:PSS composite films. Also, the thermoelectric properties of the Ag2Te@PEDOT:PSS composite films as a function of AgNO3 concentration were measured. The electrical conductivity of Ag2Te@PEDOT:PSS composite films first increases as the increasing AgNO3 concentration, and then decreases due to the formation of TeO2. The Seebeck coefficient of the Ag2Te@PEDOT:PSS composite films decreases significantly with the increasing concentration of AgNO3. The phenomenon can be contributed to the N type conduction of Ag2Te, and when the amount of electron provided by Ag2Te is larger than the amount of hole from Te, the conduction mechanism changes from P type to N type. As the further increasing concentration of AgNO3, the absolute value of Seebeck coefficient of the Ag2Te@PEDOT:PSS composite films increases. And the value reaches (?55.9±3.3) μV/K when the concentration of AgNO3 is 10 mmol. The N type Ag2Te@PEDOT:PSS composite film shows a maximum power factor of (8.4±0.7) μW/(m·K2) with 20 mmol AgNO3. |
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