A study on the synthesis and characterization of SnS nanoparticles for photocatalytic and photovoltaic applications
- 주제(키워드) SnS nanoparticles , photocatalytic , photovoltaic applications
- 발행기관 아주대학교
- 지도교수 김유권
- 발행년도 2019
- 학위수여년월 2019. 8
- 학위명 석사
- 학과 및 전공 일반대학원 에너지시스템학과
- 실제URI http://www.dcollection.net/handler/ajou/000000029064
- 본문언어 영어
- 저작권 아주대학교 논문은 저작권에 의해 보호받습니다.
초록/요약
In the last few decades, Tin (II) sulphide (SnS) driven by its unique properties being low cost, lack of toxicity and its abundance in nature, has received great recognition in a majority of applications such as photocatalysis and photovoltaics. Single-crystals SnS has been synthesis and modified in various ways with the aim of improving in its efficiency which as of now is still relatively low. Some of the modification techniques involve reducing the particle size and/or forming a composite with other materials. In this study, single crystal SnS with an indirect bandgap of 0.92-1.07 eV was synthesized at different temperatures. The structure of this material, composition, and optical properties of the as-synthesized SnS were characterized by XRD spectroscopy, SEM images, UV–vis spectra. The as-synthesized SnS material showed good photocatalytic activity in the degradation of MB under visible light (LED) with rate constant of 3.943x10-3 min-1 which was attributed to the bandgap of the material. To improve on this activity another synthetic method was used to synthesis, SnS nanoflower with a direct bandgap of 1.55 eV via a wet chemical method. This material showed enhanced activity for the degradation of MB (rate constant = 6.5625 x10-3 min-1) which was about 2 times higher than that of SnS powder. Using RhB the results were even more staggering, SnS powder had a rate constant of 6.1115 x10-4 min-1 that was about 10times less for SnS nanoflower (7.1994 x10-3 min-1). This difference was owing to the change in morphology and large specific surface area due to the size difference. SnSNS/SnS2NS composite was also synthesis through facile ultrasonic exfoliation of bulk SnS and SnS2 in N-methyl-2-pyrrolidone (NMP). The SnSNS/SnS2NS composite had activity for the degradation of MB 1.01 x10-2 min-1 which was higher than pure SnS and pure SnS2 under visible light irradiation. The particle size and the low recombination rate was suggested to be the factors behind the increase in the rate constant.
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CONTENTS
Abstract i
Contents iii
List of Figures vi
Chapter 1 Synthesis of SnS powder and its photocatalytic activity 1
1.1 Introduction: 1
1.2 Experimental Section: 4
1.2.1 Materials: 4
1.2.2 Synthesis of SnS in a closed reactor 4
1.2.3 Synthesis of SnS in the flow reactor 6
1.3 Results and discussion: 7
1.3.1 Photocatalytic activity evaluation. 13
1.4 Conclusion. 16
Chapter 2 Synthesis of SnS nanoflower and its Photocatalytic activity 17
2.1 Introduction: 17
2.2 Experimental Section 18
2.2.1 Materials: 18
2.2.2 Synthesis of Sn (II) oxy-hydroxide (Sn6O4(OH)4).27 18
2.2.3 Synthesis of SnS nanoflowers. 19
2.3 Results and discussion: 21
2.4 Conclusion: 28
Chapter 3 Synthesis of SnSNS/SnS2NS composites 29
3.1 Introduction: 29
3.2 Experimental section: 31
3.2.1 Materials: 31
3.2.2 Synthesis of SnS2 in a closed reactor. 31
3.2.3 Synthesis of SnSNS/SnS2NS composite. 32
3.3 Results and discussion: 34
3.4 Conclusion 41
References: 42
