Devices with negative differential transconductance (NDT) and negative differential resistance (NDR) have shown a strong potential for digital electronics with high information density due to their N-shaped current–voltage (I–V) characteristics leading to multiple threshold voltages ( Vths). The 2D materials, such as graphene, hBN, MoS2, WS2, etc., offer an attractive platform to achieve NDT and NDR because of the absence of dangling bonds on the surface, leading to a high-quality interface between the layers. The 2D materials' unique property of the weak van der Waals (vdW) interactions without dangling bonds on the heterostructure devices shows the way for the applications more than-Moore devices. This review holds a well-timed overview of 2D materials-based devices to develop future multi-valued logic (MVL) circuits exhibiting high information density. Notably, the recent advances in emerging 2D materials are reviewed to support the directions for future research on MVL applications.

With the booming popularity of social media such as facebook and Wechat, more and more people and firms commence to utilize it to promote products and services. The convenience of sharing personal experience online, however, also leads to increasing number of consumer to complain through online reiews. For example, negative online review has increased 800% over the years between 2014 and 2015 (Causon 2015) and has negative impact on many viewers’ buying decisions (Chevalier, & Mayzlin, 2006). Therefore, it is important to investigate what factors would reduce the negative impact of other customers’ online complaints on consumer purchase intention. Developing friendships with customers through social media is a common strategy for service provider to retain customers. Prior literature suggests that consumers in general are more tolerant of a service failure when the service provider is having a friendship with the customer than when the provider is having a business relationship (Wan, Hui, and Wyer 2011). Therefore, we suggest that friendship could also attenuate the negative impact of an online complaint from other customer on consumer purchase intention. Furthermore, we predict that this could happen only in the self-consumption situation. In the consumption situation of buying gifts for others, friendship would no longer attenuate the impact of a negative online review on consumer purchase intention. It is because gift giving involves sybolic value of face enhancement in developing social relationships with the gift giving target. Consumers would be less likely to take risks of buying substandard products as gifts. Implications and future research directions will be discussed.

The advances of the Internet open consumers new opportunities to share their consumption experiences, opinions and feelings with others. Online customer reviews (OCRs) are a crucial source of information for consumers and are regarded as one of the most influential types of electronic word-of-mouth (eWOM) in shaping consumer attitudes and facilitating purchase decisions (Plummer, 2007). Prior research has produced a number of valuable insights on OCRs (e.g., Dellarocas, Gao, & Narayan, 2010; Hennig-Thurau et al., 2004; Mayzlin, Dover, & Chevalier, 2014). Especially the influence of OCR valence (positively vs. negatively framed information) has received considerable attention both from practitioners and from scholars (e.g., Xue & Zhou, 2010; Yang & Mai, 2010; Lee et al., 2009). However, we argue that scientific insights on the influence of OCR valence remain limited. Specifically, this paper shows that the level of source credibility (high vs. low) as well as the type of product (search vs. experience good) are important moderators of the influence of OCR valence on several consumer OCR reactions (product attitude, product quality, and product trust) under specific circumstances only. Four hundred and sixteen respondents (70% females, average age 24 years) participated in an experiment with a 2×2×2 between-subjects full factorial design manipulating the OCR valence (positive vs. negative), the source credibility (high vs. low) and the product type (search vs. experience good). Results demonstrate that the effect of positive OCRs from highly credible sources on diverse outcome variables is larger than from low credible sources. By acknowledging Chaiken et al.’s (1989) theoretical extension of the heuristic-systematic model (Chaiken, 1980) we provide empirical evidence that source credibility intensifies the impact of positive OCRs due to the additivity effect. In contrast, credible negative information is not more influential than incredible information. A similar mechanism becomes operational when considering product type. Here, positive OCRs about experience goods have a stronger influence on product evaluations than similarly valenced information about search goods. This research provides further support for the crucial role of credible, positive OCRs in affecting consumer behavior in contrast to their negative counterparts. From a practical perspective, marketers should consider including highly credible OCRs from trustworthy and experienced customers’ peers as decision aids. This can be achieved, for instance, by including personal postings from Facebook. Such a strategy is particularly efficient as positive OCRs increase the consumer’s confidence towards the product while credible negative OCRs are not more harmful than incredible ones.