Standard reference material and different geological samples were dissolved by system A (the mixture of nitric and perchloric acids) and system B (mixture of nitric, perchloric and hydrofluoric acids), and total Se in...Standard reference material and different geological samples were dissolved by system A (the mixture of nitric and perchloric acids) and system B (mixture of nitric, perchloric and hydrofluoric acids), and total Se in all samples was measured by hydride-generation atomic fluorescence spectrometry (HG-AFS) after concentration with thiol cotton fiber (TCF). The analytical results obtained by the two digestion method are in good agreement (within the limit of errors) for most of the samples, particularly for those having recommended values. The Se concentrations determined by the two methods are of no difference, and the correlation coefficient is 0.9986; the relative standard deviation (RSD) for the determination of 0.04 μg/g Se is 10.2%. The recovery rates of systems A and B by the stan- dard-addition method were 96%–106% and 99%–104%, respectively.展开更多
A method of fabricating selenium（Se） microwire is demonstrated.A multimaterial fiber with amorphous selenium（a-Se） core and multicomponent phosphate glass cladding is drawn by using a conventional optical fiber dr...A method of fabricating selenium（Se） microwire is demonstrated.A multimaterial fiber with amorphous selenium（a-Se） core and multicomponent phosphate glass cladding is drawn by using a conventional optical fiber drawing technique.Then the a-Se core of the fiber is crystallized by a post thermal process at 150 ℃.After the multicomponent phosphate glass cladding is stripped from the multimaterial fiber by marinating the fiber in HF acid solution,a crystalline selenium（c-Se）microwire with high uniformity and smooth surface is obtained.Based on microstructure measurements,the c-Se microwire is identified to consist of most hexagonal state particles and very few trigonal state whiskers.The good photoconduction property of c-Se microwire with high quality and longer continuous length makes it possible to apply to functional devices and arrays.展开更多
基金the Knowledge-Innovation Program of the Chinese Academy of Sciences（KZCX3-SW-125）；the National Natural Science Foundation of China（Grant Nos.60633110,40003008）.
文摘Standard reference material and different geological samples were dissolved by system A (the mixture of nitric and perchloric acids) and system B (mixture of nitric, perchloric and hydrofluoric acids), and total Se in all samples was measured by hydride-generation atomic fluorescence spectrometry (HG-AFS) after concentration with thiol cotton fiber (TCF). The analytical results obtained by the two digestion method are in good agreement (within the limit of errors) for most of the samples, particularly for those having recommended values. The Se concentrations determined by the two methods are of no difference, and the correlation coefficient is 0.9986; the relative standard deviation (RSD) for the determination of 0.04 μg/g Se is 10.2%. The recovery rates of systems A and B by the stan- dard-addition method were 96%–106% and 99%–104%, respectively.
基金Project supported by the National Natural Science Foundation for Distinguished Young Scientists,China(Grant No.61325024)the High-Level Personnel Special Support Program of Guangdong Province,China(Grant No.2014TX01C087)+3 种基金the Fundamental Research Funds for the Central Universities,China(Grant No.2015ZP019)the National High Technology and Development Program of China(Grant Nos.2013AA031502 and 2014AA041902)the National Natural Science Foundation of China(Grant Nos.51472088,61535014,and 51302086)the Fund of Guangdong Provincial Cooperation of Producing,Studying and Researching,China(Grant No.2012B091100140)
文摘A method of fabricating selenium（Se） microwire is demonstrated.A multimaterial fiber with amorphous selenium（a-Se） core and multicomponent phosphate glass cladding is drawn by using a conventional optical fiber drawing technique.Then the a-Se core of the fiber is crystallized by a post thermal process at 150 ℃.After the multicomponent phosphate glass cladding is stripped from the multimaterial fiber by marinating the fiber in HF acid solution,a crystalline selenium（c-Se）microwire with high uniformity and smooth surface is obtained.Based on microstructure measurements,the c-Se microwire is identified to consist of most hexagonal state particles and very few trigonal state whiskers.The good photoconduction property of c-Se microwire with high quality and longer continuous length makes it possible to apply to functional devices and arrays.
