{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,8]],"date-time":"2026-02-08T00:51:33Z","timestamp":1770511893696,"version":"3.49.0"},"reference-count":37,"publisher":"MDPI AG","issue":"1","license":[{"start":{"date-parts":[[2020,1,6]],"date-time":"2020-01-06T00:00:00Z","timestamp":1578268800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["31671578"],"award-info":[{"award-number":["31671578"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>In this work, ammonium pyrrolidine dithiocarbamate (APDC) was used as a surface etchant to modify CdTe\/CdS core-shell quantum dots (QDs). The APDC etchant combines with the cadmium ions (Cd2+) on the surface of the QDs, resulting in the formation of surface holes. The formation of these holes changes the QD surface structure, which leads to fluorescence quenching of the QDs. Newly added Cd2+ can selectively recognize and combine with these holes; thus, the fluorescence intensity of the QDs can be restored. The linear response of this turn-on fluorescent sensor was found to be 0\u2013100 \u03bcg\/L and 100\u2013600 \u03bcg\/L under the determined optimal conditions, and its limit of detection (LOD) for Cd2+ was 2.642 \u03bcg\/L (23.5 nmol\/L).<\/jats:p>","DOI":"10.3390\/s20010312","type":"journal-article","created":{"date-parts":[[2020,1,6]],"date-time":"2020-01-06T10:34:46Z","timestamp":1578306886000},"page":"312","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":10,"title":["Ammonium Pyrrolidine Dithiocarbamate-Modified CdTe\/CdS Quantum Dots as a Turn-on Fluorescent Sensor for Detection of Trace Cadmium Ions"],"prefix":"10.3390","volume":"20","author":[{"given":"Yuan","family":"Yin","sequence":"first","affiliation":[{"name":"Key Lab of Modern Precision Agriculture System Integration Research, Ministry of Education of China, China Agricultural University, Beijing 100083, China"},{"name":"Key Lab of Agriculture Information Acquisition Technology, Ministry of Agriculture of China, China Agricultural University, Beijing 100083, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Qingliang","family":"Yang","sequence":"additional","affiliation":[{"name":"Key Lab of Modern Precision Agriculture System Integration Research, Ministry of Education of China, China Agricultural University, Beijing 100083, China"},{"name":"Key Lab of Agriculture Information Acquisition Technology, Ministry of Agriculture of China, China Agricultural University, Beijing 100083, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Gang","family":"Liu","sequence":"additional","affiliation":[{"name":"Key Lab of Modern Precision Agriculture System Integration Research, Ministry of Education of China, China Agricultural University, Beijing 100083, China"},{"name":"Key Lab of Agriculture Information Acquisition Technology, Ministry of Agriculture of China, China Agricultural University, Beijing 100083, China"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2020,1,6]]},"reference":[{"key":"ref_1","first-page":"371","article-title":"Cadmium in Human Diseases: It\u2019 More than Just a Mere Metal","volume":"34","author":"Fatima","year":"2019","journal-title":"Indian. 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