Professor Raymond Wong (left) and Dr Qian Liu (right) and their partners in Japan develop a nanosheet which offers a promising energy conversion system.


黃維揚教授(左)、劉倩博士(右)與日本學者,成功研發用於光電能轉換的納米片,是能源轉換的重要材料。

Date: 02 Nov 2015 (Monday)

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HKBU and Japanese scholars jointly publish research on novel nanosheet in "Nature Communications"

浸大與日本學者共同研製新型納米材料     論文刊登於《自然-通訊》期刊

Professor Raymond Wong, Head and Chair Professor of the Department of Chemistry and Elizabeth Law Endowed Chair of Advanced Materials of HKBU, Dr Qian Liu, HKBU PhD alumna and the team of Professor Hiroshi Nishihara from The University of Tokyo, Japan collaborated on a research project entitled "A photofunctional bottom-up bis(dipyrrinato)zinc(II) complex nanosheet" through which they developed a new promising nanomaterial which can be used as an active layer for photoelectric energy conversion. The paper was published in leading academic journal Nature Communications (http://www.nature.com/ncomms/2015/150402/ncomms7713/full/ncomms7713.html). The work was also highlighted via Nature Japan twitter.

In the study, a novel photofunctional bottom-up nanosheet containing the photoactive bis(dipyrrinato)zinc(II) complex motif was fabricated. The new material is able to convert energy from light into electrical energy.

A single-layer nanosheet measuring 10 μm on one side, which is large for bottom-up nanosheet materials, can be deposited repeatedly on a flat substrate resulting in quantitative layering. Professor Wong said, “A significant advantage of the bottom-up synthesis is that structures and properties can be customized in the process through the selection of components, for instance, metal ions and organic ligands.”

Two-dimensional (2D) polymeric nanosheets have recently gained a lot of attention, particularly top-down nanosheets such as graphene and metal chalcogenides that are produced by slicing bulk layered mother materials. Although bottom-up nanosheets manufactured directly from molecular components can exhibit greater structural diversity than top-down nanosheets, the bottom-up nanosheets reported thus far lack useful functionalities. The new nanosheet in this study stands out from previous bottom-up nanosheets because of its ability to efficiently collect visible light. The study also shows the ease in which various substrates can be deposited to produce a platform with photoelectric conversion function.

Professor Wong added that this novel molecule-based bottom-up nanosheet possessing photofunctionality could lead to more research into creating useful and promising nanomaterials which will in turn open up new areas where this type of two-dimensional nanomaterials can be applied.

浸大化學系系主任及講座教授、羅嘉穗先進材料研究講座教授黃維揚教授,與浸大校友劉倩博士及日本東京大學西原寬教授的研究小組,成功研製用於光電能轉換的納米活性層材料,並發表「具有光功能由下而上合成的雙聯吡咯啉類鋅複合物納米片」的論文。該論文刊登於國際權威科學期刊《自然-通訊》(http://www.nature.com/ncomms/2015/150402/ncomms7713/full/ncomms7713.html),《自然》日本「推特」網站亦曾報道有關論文。

是次研究採用由下而上方法合成出一種新型具有光功能、以雙聯吡咯啉類鋅複合物為活性成份的納米片,此材料有效將光能轉換為電能。

研製的單層納米片一邊長度約10微米,對於現有由下而上合成的納米片材料是很大的尺寸。它可重複鍍在平面物料上成為多層納米片。黃教授說﹕「新物料最大的好處是可因應不同的應用,自行選擇材料,如金屬離子及化學有機配體,透過由下而上合成,製備出各種結構和性質不同的納米片。」

二維聚合物結構的納米片近來獲得研究人員垂青,特別是從大型材料「由上而下」切成的納米片,例如石墨烯和金屬硫屬化合物等。相對於由上而下切成的納米片,從分子由下而上合成的納米片,雖然具有更好的結構多樣性,但至今此類納米片仍缺乏優越的功能性。黃教授團隊研發的新型納米片可有效收集可見光,而且易於沉積在各種平面物料,成為可轉換光電的新材料。

黃教授補充說,這種以分子為基礎、由下而上合成的納米片已證實具有光功能,日後將更有效研究它的其他新用途。