检索结果-南通市图书馆

Bolstering functionality in multilayer and bilayer WS2 via focused laser micro-engraving

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2023年第6期66卷 94-101页

作者： Si Min ChAN eng Tuan POh Jin Feng LEONg kuan eng johnson g.h Chorng.haur SOW Department of Physics National University of Singapore Institute of Materials Research and engineering Agency for ScienceTechnology and Research (A~*STAR) Division of Physics and Applied Physics School of Physical and Mathematical SciencesNanyang Technological University

Laser thinning of multilayer transition metal dichalcogenide(TMD)crystals has long been explored for its potential to produce localized domains of optically functional monolayers. Despite the high spatial control and resolution of the laser, the range of appropriate applications for these laser-thinned domains is still limited by the peripheral regions of unaltered thick multilayers. herein, we report a newfound property of the laser-thinned regions to adhere strongly to the underlying substrate when lasered down to the monolayer limit. Upon a brief sonication in various solvents, the surrounding pristine multilayers can be lifted off, solely leaving behind the post-lasered monolayer patterns. Coupled with the flexible maneuver of the laser, various monolayer designs can be achieved, including micro-antenna, waveguide, and electrode geometries with lateral line widths at 1.5 μm resolution. Furthermore, we also detail the optical properties of the monolayers obtained from laser thinning, with those acquired from multilayers containing more defectbound excitons, whereas those lasered from bilayers presenting a trion-dominated profile similar to as-grown monolayers. Together, these findings allow for faster and more efficient multilayer removal and areal shaping of optically active monolayer domains, in comparison to multistep and complex standard lithographic etching(lithography–etch–develop)procedures.

关键词： WS$_2$ monolayer micro-patterning focused laser sonication lift-off

Emergence of photoluminescence on bulk MoS2 by laser thinning and gold particle decoration

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2018年第9期11卷 4574-4586页

作者： Lili gong Qi Zhang Liangjun Wang Jianfeng Wu Cheng han Bo Lei Wei Chen goki Eda kuan eng johnson g.h Chorng.haur Sow Department of Physics National University of Singapore Singapore 117542 Singapore Department of Chemistry National University of Singapore Singapore 117542 Singapore Centre for Advanced 2D Materials and graphene Research Centre National University of Singapore 6 Science Drive 2 Singapore 117546 Singapore Institute of Materials Research and engineering Agency for Science Technology and Research (A＊STAR) 2 Fusionopolis Way Innovis #08-03 Singapore 138634 Singapore

We demonstrate a facile and effective approach to significantly improve the photoluminescence of bulk MoS2 via laser thinning followed by gold particle decoration. Upon laser thinning of exfoliated bulk MoSz photoluminescence emerges from the laser-thinned region. After further treatment with an AuCl3 solution, gold particles self-assemble on the laser-thinned region and thick edges, further increasing the fluorescence of bulk MoS2 28 times and the Raman response 3 times. Such fluorescence enhancement can be attributed to both surface plasmon resonance and p-type doping induced by gold particles. The combination of laser thinning and AuCl3 treatment enables the functionalization of bulk MoS2 for optoelectronic applications. It can also provide a viable strategy for mask-free and area-selective p-type doping on single MoS2 flakes.

关键词： bulk MoS photoluminescence laser thinning gold particle plasmonic effect doping

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

玉米粉及續加葡萄糖代替乳糖發酵青黴素

微生物学报 1958年第4期 417-422页

作者：虞悝汪靓余爾穀包德媺官希玲許文思童村化学工业部第三制药厂

青黴素發酵所用的碳源,至今被認為乳糖最佳,因為它在產生青黴素的階段中,能緩慢而又均匀地被利用,且不會很快地用於菌絲生長,能使產生青黴青期延長。惟乳糖來源終歸有限,價值亦昂,自然要用其他糖類代替。有關乳糖代用品的研究已有很多... 详细信息

青黴素發酵所用的碳源,至今被認為乳糖最佳,因為它在產生青黴素的階段中,能緩慢而又均匀地被利用,且不會很快地用於菌絲生長,能使產生青黴青期延長。惟乳糖來源終歸有限,價值亦昂,自然要用其他糖類代替。有關乳糖代用品的研究已有很多記載。其中比較切合實際的,當推johnson氏的連續添加葡萄糖以維持青黴菌在發酵過程中半飢餓狀態的方法。惟能否用於大規模生產,尚無所聞。我們認為在青黴素發酵過程中,

关键词：玉米粉花生粉碳源加糖量葡萄糖右旋糖己糖乳糖乳制品

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

鹖冠子其人与其思想新探

管子学刊 2008年第3期 43-48页

作者：杨兆贵澳门大学教育学院

本文认为从现存资料很难证明鹖冠子必定是楚人或是赵人。从《鹖冠子》一书中的相关记载,可见他和赵、楚、秦、齐诸国的思想文化有相当的关系。他的弟子是庞煖,而非庞焕,庞煖与庞焕并非同一人。他的思想虽属于黄老学,但有自己特色的理论... 详细信息

本文认为从现存资料很难证明鹖冠子必定是楚人或是赵人。从《鹖冠子》一书中的相关记载,可见他和赵、楚、秦、齐诸国的思想文化有相当的关系。他的弟子是庞煖,而非庞焕,庞煖与庞焕并非同一人。他的思想虽属于黄老学,但有自己特色的理论:水火相生说、天神地形说、五正说、成鸠氏理想统治说等。有些思想观念有矛盾。

关键词：鹖冠子《鹖冠子》黄老学战国时期

维普期刊数据库