Non-stoichiometric copper selenide(Cu2-xSe,x=0.18～0.25)nanomaterials have attracted extensive attentions due to their excellent thermoelectric,optoelectronic and photocatalytic performances.However,efficient production of Cu2-xSe nanoparticles(NPs)through a green and convenient way is still hindered by the inevitable non-environmentally friendly operations in common chemical synthesis.Herein,we initially reveal the coexistence of seleninic acid content and elemental selenium(Se)NPs in pulsed laser-generated Se colloidal solution.Consequently,we put forward firstly a closed-cycle reaction mode for totally green production of Cu1.8Se NPs to exclude traditional requirements of high temperature and toxic precursors by using Se colloidal solution.In such closed-cycle reaction,seleninic acid works as the initiator to oxidize copper sheet to release cuprous ions which can catalyze the disproportion of Se NPs to form SeO3 and Se2-ions and further produce Cu2-xSe NPs,and the by-product SeO32-ions promote subsequent formation of cuprous from the excessive Cu sheet.In experiments,the adequate copper(Cu)sheet was simply dipped into such Se colloidal solution at 70℃,and then the stream of Cu1.8Se NPs could be produced until the exhaustion of selenium source.The conversion rate of Se element reaches to more than 75％when the size of Se NPs in weakly acidic colloidal solution is limited between 1 nm and 50 nm.The laser irradiation duration shows negative correlation with the size of Se NPs and unobvious impact to the pH of the solution which both are essential to the high yield of Cu1.8Se NPs.Before Cu sheet is exhausted,Se colloidal solution can be successively added without influences to the product quality and the Se conversion rate.Such green methodology positively showcases a brand-new and potential strategy for mass production of Cu2-xSe nanomaterials.

Zhangyu Gu;Yisong Fan;Yixing Ye;Yunyu Cai;Jun Liu;Shouliang Wu;Pengfei Li;Junhua Hu;Changhao Liang;Yao Ma

Henan Institute of Advanced Technology,Zhengzhou University,Zhengzhou 450001,China;Key Laboratory of Materials Physics and Anhui Key Laboratory of Nanomaterials and Nanotechnology,Institute of Solid State Physics,Hefei Institutes of Physical Science,Chinese Academy of Sciences,Hefei 230031,China;Anhui Institute of Optics and Fine Mechanics,Hefei Institutes of Physical Science,Chinese Academy of Sciences,Hefei 230031,China;School of Materials Science and Engineering,Zhengzhou University,Zhengzhou 450001,China;University of Science and Technology of China,Hefei 230026,China;Technology Center,Benecke Changshun Auto Trim(Zhangjiagang)Co.,Ltd.,No.8,Changyang Rd.,Nansha,Jingang Town,Zhangjiagang 215632,China

中国物理B（英文版）

[1]Zhangyu Gu;Yisong Fan;Yixing Ye;Yunyu Cai;Jun Liu;Shouliang Wu;Pengfei Li;Junhua Hu;Changhao Liang;Yao Ma-.Novel closed-cycle reaction mode for totally green production of Cu1.8Se nanoparticles based on laser-generated Se colloidal solution)[J].中国物理B（英文版）,2022(07):46-53

8Se,seleninic,disproportion

Novel,closed,cycle,reaction,mode,totally,green,production,Cu1,nanoparticles,laser,generated,colloidal,solution,Non,stoichiometric,copper,selenide,Cu2,xSe,nanomaterials,have,attracted,extensive,attentions,due,their,excellent,thermoelectric,optoelectronic,photocatalytic,performances,However,efficient,NPs,through,convenient,way,still,hindered,by,inevitable,environmentally,friendly,operations,common,chemical,synthesis,Herein,initially,reveal,coexistence,content,elemental,selenium,pulsed,Consequently,put,forward,firstly,exclude,traditional,requirements,high,temperature,toxic,precursors,using,In,such,works,initiator,oxidize,sheet,release,cuprous,which,can,catalyze,Se2,further,SeO32,promote,subsequent,formation,from,excessive,experiments,adequate,was,simply,dipped,into,then,stream,could,produced,until,exhaustion,source,conversion,reaches,more,than,when,size,weakly,acidic,limited,between,irradiation,duration,shows,negative,correlation,unobvious,impact,both,are,essential,yield,Before,exhausted,successively,added,without,influences,quality,Such,methodology,positively,showcases,brand,new,potential,strategy,mass

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