ECL emission of non-stoichiometric quaternary Zn–Cu–In–S QDs

Micro & nano letters

article

Jian Feng¹  Hong Xu¹ 

[1] Department of Chemistry, Guizhou Medical University

关键词: zinc compounds;    copper compounds;    indium compounds;    semiconductor materials;    semiconductor quantum dots;    nanoparticles;    nanofabrication;    semiconductor growth;    colloidal crystals;    stoichiometry;    chemiluminescence;    transmission electron microscopy;    X-ray diffraction;    ultraviolet spectra;    visible spectra;    photoluminescence;    mass spectroscopic chemical analysis;    particle size;    surface states;    ECL emission;    nonstoichiometric colloidal quaternary zinc-copper-indium-sulphur quantum dots;    hot injection method;    electrogenerated chemiluminescence;    transmission electron microscopy;    TEM;    X-ray diffraction;    XRD;    ultraviolet-visible spectrometry;    photoluminescence;    inductively coupled plasma mass spectrometry;    ICP-MS;    compositional homogeneity;    particle sizes;    crystallinity;    glassy carbon electrode;    tetrabutylammonium hexafluorophosphate;    tripropyl amine;    surface state;    bioanalysis;    ZnCuInS;   

DOI  :  10.1049/mnl.2017.0669

学科分类：计算机科学（综合）

来源: Wiley

【 摘 要 】

Background:  Resource-poor small-scale farmers often cannot afford the high prices of chemical insecticides to control pests on crops; as a result, some use botanical insecticides.   Aim:  The aim of the study was to document ethnobotanical pest control methods used by rural small-scale farmers to control pests of cabbage in the Eastern Cape Province of South Africa.   Setting:  217 rural small-scale crop-producing farmers from 14 towns in the Amathole, Joe Gqabi, Alfred Nzo, Chris Hani and OR Tambo Districts participated in the study.   Methods:  Questionnaires were administered to consenting farmers between July and November in 2012, using the convenience and stratified purposive sampling techniques. Data collected were subjected to descriptive statistical analysis.   Results:  The majority of farmers using botanical insecticides were females above the age of 60 years. The farmers identified 23 plants, which they use in their pest control strategies against seven pests of cabbage. The annual herb  Tagetes minuta  L. (Asteraceae) was cited as the most commonly used herb by 47% of the respondents, followed by  Chenopodium ambrosioides  L. (Chenopodiceae),  Aloe ferox  Mills. (Asphodelaceae) and  Nicotiana tabacum  L. (Solanaceae). Various plant parts were used in combinations or alone in the preparation of formulations mainly against aphids, cutworms and the diamondback moth.   Conclusion:  The plants, plant parts, combinations and formulations used by farmers in their cabbage pest control strategies need to be scientifically authenticated for efficacy.

【 授权许可】

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